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ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL

Rev.

7

MM-9-29

Aug

22/16

CAUTION: Do not proceed unless the universal block has been assembled

(shimmed) in accordance with paragraph 9-3, C.

(9) Check the flapping bearing drag resistance at the blade pin. Initially, the grip should

not stay up. Add shim thickness in 0.005 inch increments to achieve sufficient
resistance to hold the grip in the up-stop position at 150 ft-lbs/203.4 Nm. Remove
one shim and verify the flapping bearing moves freely.

(10) Secure the nut by bending one of the tabs on the lockwasher (4) into a slot in the nut.

(11) Lubricate the retention assembly (para. 4-28).

(12) Install the main rotor damper (para. H), connect the pitch change link to the pitch

change bellcrank and the pitch horn, and install the main rotor blade (para. 9-13).

NOTE:

Paragraph G reserved for future use.

UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED

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Summary of Contents for 280F Series

Page 1: ...2 JW 3 3 94 8 17 12 JW 4 6 4 12 8 17 12 JW 5 11 5 13 2 21 14 AD 6 4 7 15 7 22 15 LN 7 8 22 16 9 2 16 JW 8 9 20 17 10 2 17 JW 9 12 14 17 12 22 17 JW Maintain this record in the front of the manual UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 2: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 3: ...ation Regulations unless an alternative program has been FAA approved Copyright 1985 2017 The Enstrom Helicopter Corporation 2209 22nd Street Menominee Michigan 49858 3515 Telephone 906 863 1200 Fax 906 863 6821 www enstromhelicopter com UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification o...

Page 4: ...INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 5: ...s been omitted or requires clarification please direct your comments to Enstrom via this form duplicate or other similar form Send the recommended changes to The Enstrom Helicopter Corporation 2209 22nd Street Menominee MI 49858 3515 ATTN Technical Publications Manual Identification Enstrom F 28F 280F Series Maintenance Manual dated 1985 Revision Number and Date Aircraft Model Recommended Change U...

Page 6: ...NTENANCE MANUAL Rev 5 ii Nov 5 13 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 7: ...Rotor Assembly MM 2 10 2 11 tail Rotor Assembly MM 2 10 2 12 Operating Limitations and Restrictions MM 2 10 2 13 Placards MM 2 10 2 14 Vendor Manuals MM 2 11 2 15 Special Tools MM 2 13 2 16 Torque Data MM 2 16 2 17 Consumable Parts List MM 2 20 Section 3 Airworthiness Limitations FAA Cover Page MM 3 1 Log of Revisions MM 3 2 Table of Contents MM 3 3 3 1 Retirement Life Items MM 3 5 3 2 Mandatory I...

Page 8: ...on Alternate Method MM 4 36 4 35 Upper Pulley Jackstrut Bearing MM 4 37 4 36 Lubrication MM 4 37 4 37 Collective Guidetube Bearing MM 4 37 4 38 Lubrication MM 4 37 4 39 Cyclic Swashplate Bearing MM 4 37 4 40 Lubrication MM 4 37 4 41 Idler Pulley Bearings MM 4 38 4 42 Lubrication MM 4 38 4 43 Lubrication Preferred Method MM 4 38 4 44 Lubrication Alternate Method MM 4 38 4 45 Recommended Overhaul Cy...

Page 9: ...75 4 81 Storage for longer than 6 Months MM 4 75 4 82 Preventive Maintenance for Corrosion Control MM 4 76 4 83 General Information MM 4 76 4 84 Scheduled Field Preventive Maintenance Program MM 4 76 Section 5 Weight and Balance 5 1 General Information MM 5 1 5 2 Approved Center of Gravity Envelopes MM 5 1 5 3 Weighing the Helicopter MM 5 3 5 4 Loading MM 5 6 Section 6 Electrical System 6 1 Electr...

Page 10: ...uments MM 7 15 Section 8 Structures 8 1 Cabin MM 8 1 8 2 Windshields and Windows MM 8 4 8 3 Reserved 8 4 Cabin Doors MM 8 11 8 5 Reserved 8 6 Reserved 8 7 Seat Belts Lap Type MM 8 17 8 8 Seat Deck and Bulkheads MM 8 18 8 9 Landing Gear MM 8 19 8 10 Pylon MM 8 39 8 11 Baggage Compartment MM 8 39 8 12 Tailcone Assembly MM 8 42 8 12 1 Tubular Tail Rotor Guard MM 8 44 8 12 2 Tail Rotor Driveshaft Cove...

Page 11: ... and Pulley Assembly MM 11 26 11 8 Idler Pulley Troubleshooting MM 11 36 11 9 Belt Tension Assembly MM 11 53 Section 12 Flight Controls 12 1 Troubleshooting the Articulated Rotor System MM 12 1 12 2 Main Rotor Blade Tracking Spotlight and Reflectors MM 12 9 12 3 Main Rotor Blade Tracking Chadwick System MM 12 12 12 4 Collective Pitch Control Stick MM 12 18 12 5 Collective Trim System MM 12 21 12 6...

Page 12: ...Reserved Section 18 Powerplant 18 1 General MM 18 1 Section 19 Main Rotor Transmission 19 1 General MM 19 1 19 2 Main Rotor Gearbox Chip Detector MM 19 1 19 3 Lubricant Change MM 19 2 Section 20 Belt Drive System 20 1 General Information MM 20 1 Section 21 Electrical Systems and Components 21 1 General MM 21 1 21 2 Combined Anticollision and Navigation Lights MM 21 1 21 3 Annunciator Panel MM 21 1...

Page 13: ...tor MM 24 1 24 2 Description MM 24 1 24 3 Maintenance MM 24 2 24 4 Troubleshooting MM 24 2 Section 25 Tail Rotor Drive Assembly 25 1 General MM 25 1 25 2 Tail Rotor Driveshaft MM 25 1 25 3 Tail Rotor Gearbox Chip Detector MM 25 1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of update...

Page 14: ...INTENANCE MANUAL Rev 5 x Nov 5 13 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 15: ... 2 N A N A 4 Jun 21 12 iii through xii MM 3 1 through MM 3 6 MM 3 7 through MM 3 30 deleted MM 4 1 through MM 4 76 MM 9 49 through MM 9 76 MM 10 1 10 2 10 13 10 14 10 14 1 10 14 2 10 15 10 16 MM 17 1 17 2 MM 21 1 through MM 21 30 N A G Michalik ACE 116C 5 Nov 5 13 Cover i through xii MM 1 1 through MM 1 4 MM 2 1 through MM 2 20 MM 4 50 MM 4 55 MM 4 61 MM 4 62 MM 4 64 MM 4 67 MM 6 5 MM 6 6 MM 10 14...

Page 16: ... 41 MM 10 42 MM 10 45 MM 10 48 through MM 10 50 MM 11 25 MM 11 26 MM 13 14 MM 13 17 MM 13 19 MM 13 20 MM 13 22 MM 13 23 MM 13 33 MM 13 38 MM 13 40 MM 13 78 MM 13 79 N A N A 8 Sep 20 17 Cover iii through ix xii MM 1 1 MM 1 3 MM 1 4 through MM 1 6 MM 2 18 MM 2 20 MM 3 2 MM 3 3 MM 4 1 MM 4 29 through MM 4 34 2 MM 4 41 MM 4 44 MM 4 46 MM 4 51 MM 4 53 MM 4 54 MM 4 59 MM 4 63 MM 4 65 MM 8 0 through MM 8...

Page 17: ...1 2 Aircraft Effectivity MM 1 3 1 3 Maintenance Manual Supplements MM 1 3 1 4 Maintenance Manual Changes and Revisions MM 1 3 1 5 Service Document Publications MM 1 4 1 6 Application of Warnings Cautions and Notes MM 1 5 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 18: ...3 SECTION 1 INTRODUCTION TABLE OF CONTENTS Paragraph Description Page INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 19: ...ts Maintenance procedures for optional equipment may be provided in maintenance manual supplements These supplements are part of the F 28F 280F Series Maintenance Manual when an aircraft is equipped with optional equipment which requires a maintenance manual supplement The following optional equipment supplements are applicable to the F 28F 280F Series Maintenance Manual Supplement 1 Avionic Syste...

Page 20: ...intenance manual as needed at a later date 3 Service Instructions Used to provide the owner operator and or maintenance personnel with information that is applicable to specific aircraft and does not meet the criteria of a Service Information Letter or Service Directive Bulletin Service Instructions will not be distributed to the entire fleet Service Information Letters and Service Directive Bulle...

Page 21: ... processes methods or procedures that must be followed to avoid personal injury or loss of life CAUTION Calls attention to methods and procedures which must be followed to avoid damage to the aircraft or equipment NOTE Calls attention to information essential to highlight for clarification of procedures UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions t...

Page 22: ...ENANCE MANUAL Rev 8 MM 1 6 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 23: ...ine MM 2 9 2 7 Engine Cooling MM 2 9 2 8 Flight Controls MM 2 9 2 9 Power Train MM 2 10 2 10 Main Rotor Assembly MM 2 10 2 11 Tail Rotor Assembly MM 2 10 2 12 Operating Limitations and Restrictions MM 2 10 2 13 Placards MM 2 10 2 14 Vendor Manuals MM 2 11 2 15 Special Tools MM 2 13 2 16 Torque Data MM 2 16 2 17 Consumable Parts List MM 2 20 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www en...

Page 24: ...ECTION 2 GENERAL INFORMATION TABLE OF CONTENTS Paragraph Description Page INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 25: ... comprised of three sections cabin assembly pylon assembly and tail cone assembly A Cabin Assembly The cabin assembly is fabricated from molded fiberglass and is an integral unit It is attached to the pylon by six bolts and contains the aluminum seat structure plus the instrument panel cyclic collective and tail rotor controls The windshield and upper and lower windows provide excellent visibility...

Page 26: ... Nov 5 13 Sheet 1 of 4 Figure 2 1 Principal Dimensions F 28F Pre 1986 S N 743 and Prior UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 27: ...v 5 13 Sheet 2 of 4 Figure 2 1 Principal Dimensions F 28F Post 1986 S N 744 and Subsequent UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 28: ...L Rev 5 MM 2 6 Nov 5 13 Sheet 3 of 4 Figure 2 1 Principal Dimensions 280F UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 29: ... Rev 5 MM 2 7 Nov 5 13 Sheet 4 of 4 Figure 2 1 Principal Dimensions 280FX UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 30: ...per Pulley 1 213 1 1 213 1 Upper Pulley to Main Rotor 7 154 1 7 154 1 Engine to Main Rotor 8 689 1 8 689 1 Upper Pulley to Tail Rotor 1 1 1 1 Main Rotor System Number of Blades 3 3 Blade Cord Each 9 5 in 24 1 cm 9 5 in 24 1 cm Diameter 32 ft 9 75 m 32 ft 9 75 m Disc Area 804 ft2 74 7 m2 804 ft2 74 7 m2 Tail Rotor System Number of Blades 2 2 Blade Cord Each 4 4 in 11 2 cm 4 4 in 11 2 cm Diameter 4 ...

Page 31: ...oming HIO 360 series piston engine The Textron Lycoming HIO 360 series engine is a four cylinder direct drive horizontally opposed air cooled fuel injected engine The F 28F 280F series helicopters are equipped with an Enstrom installed turbocharger system which allows the engine to produce its rated horsepower up to the certified altitude limit 2 7 Engine Cooling A fan mounted on the engine cranks...

Page 32: ...n utilizes a splash lubricated non vented closed oil system A filler port and a sight gauge are located in the aft end of the transmission A magnetic drain plug located on the bottom aft side of the transmission can be checked for metal particle contamination All 280FX aircraft are equipped with chip detector annunciator in the instrument panel Starting with serial number 744 F 28F aircraft may be...

Page 33: ...cision Airmotive Corporation 14800 40TH Avenue North East Marysville WA 98271 Fuel Boost Pump P N A 10019 D 12V P N A 10019 E 24V Weldon Pump 640 Golden Oak Parkway Oakwood Village Ohio 44146 Scavenge Oil Pump P N 101678 0002 Kelly Aerospace Power Systems 1404 E South Blvd Montgomery AL 36116 Starter P N 149 12HT 12V P N 149 24HT 24V Sky Tec 350 Howard Clemmons Road Granbury TX 78230 Battery P N R...

Page 34: ...ENANCE MANUAL Rev 5 MM 2 12 Nov 5 13 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 35: ... Swashplate Gimbal Tool T 0017 Transmission Hoist Eye T 0022 Collective Spring Capsule Retainer Tool T 0026 Main Rotor Blade Tab Bending Tool T 0027 Main Rotor Blade Tab Angle Tool T 0029 SET Idler Assembly Disassembly Tool T 0035 Oleo Disassembly Tool T 0036 Blade Grip Seal Installation Tool T 0044 Pulley Alignment Tool T 0045 1 Lower Swashplate Dogleg Puller T 0048 Main Rotor Mast Nut Tool T 005...

Page 36: ...shplate Assembly T 0135 1 SET Main Rotor Transmission Pinion Crows Foot T 0136 1 O R Clutch Housing Wrench T 0140 Tail Rotor Rigging Tool T 0151 1 Universal Block Bearing Tool Set Grease Lubricated T 0152 Tail Rotor Balance Tool Photo Cell Bracket T 0156 Oil Filler Tube Adapter Wrench T 0160 1 Damper Ring Seal Installation Tools T 0168 1 Tail Rotor Assembly Holder T 0169 1 Oleo Disassembly Tool T ...

Page 37: ...nstallation Tool Kit T 2896 1 Damper Bleeding Servicing Tool 2 Required Main Rotor Transmission Stand Main Rotor Hub Stand Sprag Clutch Purge Tool Contact the Enstrom Helicopter Product Support for assistance in obtaining these tools UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of up...

Page 38: ... Nm 10 Tailcone attachment bolts 240 in lbs 27 3 Nm 11 Tail rotor assembly retention bolt 300 in lbs 34 1 Nm 12 Tail rotor blade grip nuts1 75 in lbs 8 5 Nm 13 Lower engine pulley to crankshaft bolts 50 ft lbs 67 8 Nm 14 Pitch change bellcranks a Push pull rod bolt b Push pull rod bolt with floating bushing 40 in lbs 4 5 Nm 75 in lbs 8 5Nm 15 Landing gear pivot points all 40 60 in lbs 4 5 6 8 Nm 1...

Page 39: ...1 8 12 5000 7000 3000 4200 15 000 9000 1 1 4 12 9000 11 000 5400 6600 25 000 15 000 COARSE THREAD SERIES 8 32 12 15 7 9 20 12 10 24 20 25 12 15 35 21 1 4 20 40 50 25 30 75 45 5 16 18 80 90 48 55 160 100 3 8 16 160 185 95 100 275 170 7 16 14 235 255 140 155 475 280 1 2 13 400 480 240 290 880 520 9 16 12 500 700 300 420 1100 650 5 8 11 700 900 420 540 1500 900 3 4 10 1150 1600 700 950 2500 1500 7 8 ...

Page 40: ...180 270 345 8 1 2 3 4 16 300 400 450 525 10 5 8 7 8 14 430 550 650 750 12 3 4 1 1 6 12 650 800 900 1 100 Table 2 8 Fittings Using Jam Nuts or Straight Thread O Ring Boss Tube Size Thread Size inches Torque Limits inch pounds Min Max 02 5 16 24 72 84 03 3 8 24 95 105 04 7 16 20 155 180 05 1 2 20 170 180 06 9 16 18 275 290 08 3 4 16 480 515 10 7 8 14 515 575 Table 2 9 Pitot Static System Nylon Fitti...

Page 41: ...ad size Thread Pitch On Part to be Tightened Threads per Inch Angle of Turn Aluminum Copper 8 135 67 10 135 67 12 180 90 14 180 90 16 270 135 18 270 135 20 270 135 24 360 180 28 360 180 Table 2 12 Minimum Prevailing Torque Values for Re used Self Locking Nuts FINE THREAD SERIES COARSE THREAD SERIES Thread Size inches Minimum Prevailing Torque in lbs Thread Size inches Minimum Prevailing Torque in ...

Page 42: ...page to find distributors near you www lycoming com Table 2 13 Consumable Parts List Item Part Number Quantity 50 Hour Service 1 Grease 2 Silicon Oil 3 Oil 4 Oil 5 O ring MIL PRF 81322 and MIL G 25537 SF96 20 I MIL PRF 23699 NAS1612 2 As Required As Required As Required As Required 6 EA 100 Hour Service Inspection 1 Same as 50 hour Requirements 2 Crush Washer 3 Crush Washer 4 Oil 5 Oil AN900 8 or ...

Page 43: ...intenance required under 14 CFR 43 16 and 91 403 of the Federal Aviation Regulations unless an alternative program has been FAA approved FAA APPROVED BY DATE MANAGER CHICAGO AIRCRAFT CERTIFICATION OFFICE CENTRAL REGION FEDERAL AVIATION ADMINISTRATION UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email n...

Page 44: ...8 MM 3 13 and MM 3 20 11 18 88 W F Horn 3 N A None N A N A 4 6 21 12 MM 3 1 through MM 3 6 Jul 2 12 G Michalik 5 Nov 5 13 None N A N A 6 Apr 7 15 None N A N A 7 Aug 22 16 MM 3 2 through MM 3 4 Aug 26 16 G Michalik 8 Sep 20 17 MM 3 2 MM 3 3 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification...

Page 45: ...ulation EU 748 2012 N A 2 9 28 03 Article 3 Commission Regulation EU 748 2012 N A 3 N A N A N A 4 7 9 15 FAA EASA T I P G J Michalik 5 N A N A N A 6 N A N A N A 7 9 9 16 FAA EASA T I P G J Michalik 8 10 23 17 N A N A Section 3 2 T I P UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of u...

Page 46: ...aph Description Page FAA Cover MM 3 1 Log of Revisions MM 3 2 EASA Log of Revisions MM 3 3 Table of Contents MM 3 4 3 1 Retirement Life Items MM 3 5 3 2 Mandatory Inspection Items MM 3 5 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 47: ...ashplate ECD013 11 13 Z993L13XR3B 1 200 Hrs 1 200 Hrs On Condition Housing Lower Swashplate 28 16119 1 3 17 700 Hrs 17 700 Hrs 17 700 Hrs Main Rotor Drag Link 28 14283 1 13 750 Hrs 13 750 Hrs 13 750 Hrs Tail Rotor Blade 28 150002 1 3 100 Hrs 3 100 Hrs 3 100 Hrs Tail Rotor Blade Grip 28 150044 1 3 6 200 Hrs 6 200 Hrs 6 200 Hrs Tail Rotor Driveshaft Coupling 28 13609 1 1 200 Hrs 1 200 Hrs N A Tail R...

Page 48: ...nufacture whichever occurs first all Lamiflex bearings serial numbers 5998 and subsequent Retire from service 5 calendar years from date of installation or package opening or 8 years from date of manufacture whichever occurs first On condition when used with grease fitting For aircraft certified to 2350 lb maximum weight component has no time limit Remove component on condition per maintenance man...

Page 49: ...6 1 Flushing MM 4 31 4 17 Main Rotor Dampers MM 4 32 4 18 Servicing MM 4 32 4 19 Oleos MM 4 33 4 20 Servicing MM 4 33 4 21 Battery MM 4 34 4 22 Servicing MM 4 34 4 23 Lubrication MM 4 34 4 24 Description MM 4 34 4 25 Lower Pulley MM 4 34 4 26 Lubrication MM 4 34 4 27 Main Rotor Blade Grip MM 4 34 1 4 28 Lubrication MM 4 34 1 4 29 Main Rotor Flapping Bearings MM 4 36 4 30 Lubrication MM 4 36 4 31 T...

Page 50: ...MM 4 60 4 56 General Information MM 4 60 4 57 Main Rotor Blade Strike Sudden Stoppage Minor MM 4 60 4 58 Main Rotor Blade Strike Sudden Stoppage Major MM 4 61 4 59 Tail Rotor Blade Strike Sudden Stoppage MM 4 62 4 60 Hard Landing MM 4 62 4 61 Main Rotor Overspeed MM 4 63 4 62 Main Rotor or Tail Rotor Transmission Chip Indication MM 4 64 4 63 Engine Overboost MM 4 65 4 64 Engine Overspeed MM 4 66 4...

Page 51: ...e from 45 Days to 6 Months MM 4 75 4 81 Storage for Longer than 6 Months MM 4 75 4 82 Preventive Maintenance for Corrosion Control MM 4 76 4 83 General Information MM 4 76 4 84 Scheduled Field Preventive Maintenance Program MM 4 76 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of upda...

Page 52: ...ENANCE MANUAL Rev 4 MM 4 4 Jun 21 12 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 53: ...e Sump Overrunning Clutch MIL PRF 7808 Note 4 or MIL PRF 23699 Note 5 As Required Main Rotor Transmission MIL PRF 2105 SAE J2360 or API GL 5 Note 6 3 0 Qt Dry 2 75 Qt Servicing 2 84 Liters Dry 2 6 Liters Servicing Tail Rotor Transmission MIL PRF 2105 SAE J2360 or API GL 5 Note 6 5 U S Ounces 15 Liters Main Rotor Dampers L 45 or SF96 20 Silicone Oil Grade 20 Note 8 As Required Main Rotor Blade Grip...

Page 54: ...PRF 81322 Note 12 As Required Idler Pulley Actuator Arm Pivots MIL L 6082 SAE J1966 or MIL L 22851 SAE J1899 Note 7 As Required Tail Rotor Rotating Control Pivots MIL L 6082 SAE J1966 or MIL L 22851 SAE J1899 Note 7 As Required Pitch Change Bellcrank Inboard Pivot Points MIL L 6082 SAE J1966 or MIL L 22851 SAE J1899 Note 7 As Required Cyclic Swashplate Control Rod Pivot MIL L 6082 SAE J1966 or MIL...

Page 55: ...approved domestic commercial oils Note 5 Refer to Table 4 4 for approved domestic commercial oils Note 6 Refer to Table 4 5 for approved domestic commercial oils Note 7 Any grade Note 8 SF96 20 Silicon Oil replaces L 45 Silicon Oil These oils may be mixed Note 9 MIL G 25537 grease primary MIL PRF 81322 grease alternate Do not use MIL G 25537 grease if aircraft is equipped with Lamiflex Bearings P ...

Page 56: ...s N 28 Tail Rotor Teeter Bearings Note 4 25 Hours Grease Gun 2 places N 29 Tail Rotor Pitch Control Bearing 100 Hours Syringe 1 place N 30 Collective Guidetube Bearing Note 3 6 50 Hours Grease Gun Or Hand Pack 1 place O 31 Cyclic Swashplate Bearing Note 3 7 50 Hours Grease Gun Or Hand Pack 1 place O 32 Cyclic Swashplate Control Rod Pivot 50 Hours Oil Can 1 place O 33 Pitch Change Bellcrank Pivot B...

Page 57: ...if the bearing housing is not equipped with a grease fitting Note 4 Only applies to 28 150050 and 28 150079 series tail rotor assemblies Note 5 Service in accordance with manufacturer s instructions Note 6 Also referred to as Upper Swashplate Bearing Note 7 Also referred to as Lower Swashplate Bearing UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to ...

Page 58: ...urbonycoil 600 TN600 Anderol Specialty Lubricants Aeroshell Royco Turbine Oil 500 American Oil and Supply Co American PQ Lubricant 6700 Castrol Inc BRAYCO 89 Hatcol Corp HATCOL 3211 Air BP Lubricants Inc Air BP Turbo Oil 2380 Exxon Mobil Corp EXXON ETO 2380 Stauffer Chemical Co Staufer Jet II Castrol 205 Caltex Petroleum Corp Caltex RPM Jet Engine Oil 5 Chevron International Oil Co Chevron Jet Eng...

Page 59: ...Inc Castrol Syntrax Limited Slip 75W 90 Syntec Gear Oil Table 4 6 Qualified Domestic Commercial Greases for MIL G 25537 MANUFACTURER MANUFACTURER S DESIGNATION Anderol Specialty Lubricants Royco 37 Shell Oil Company Aeroshell Grease 14 Table 4 7 Qualified Domestic Commercial Greases for MIL PRF 81322 MANUFACTURER MANUFACTURER S DESIGNATION Anderol Specialty Lubricants Royco 22CF Aeroshell Grease 2...

Page 60: ...xon Mobil Corp Beacon 325 Exxon Mobil Corp Mobilgrease 27 Petronomics Manufacturing Group Petronomics Plus M P Aircraft Grease Shell Oil Company Aeroshell Grease 33 Aeroshell Grease 7 Arpol Petroleum Co Arpolube 23827 Castrol Industrial North America Inc Castrol Aeroplex AI UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and...

Page 61: ... Drain 2 places 3 Engine Oil Filler 4 Engine Oil Dipstick View B 5 Main Fuel Filter P N 33 199 916 Sheet 1 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 62: ...ter P N 6487923 8 Engine Main Oil Cooler 9 Engine Oil Sump Drain 10 Aux Engine Oil Cooler 11 Main Fuel Filter Drain Sheet 2 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 63: ...article Plug 13 Main Rotor Gearbox Oil Level Sight Gauge View F 14 Main Rotor Gearbox Filler and Screen Sheet 3 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 64: ...ler Plugs 16 Upper Jackstrut Bearing Grease Fitting View H 17 Lower Jackstrut Bearing Grease Fitting and Purge Plug Sheet 4 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 65: ...2 places 19 Idler Strap Bushings 2 places View J 20 Drive Belt Snubber Roller Bearings Sheet 5 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 66: ...ch Engagement Cable Grease Fitting 2 places Aft top photo Forward bottom photo Sheet 6 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 67: ...h Drive Grease Fitting View M 23 Tail Rotor Drive Shaft Bearings 5 places Sheet 7 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 68: ...t Gauge 27 Tail Rotor Control Yoke Pivot Points 4 places 28 Tail Rotor Feathering Bearings 2 places 29 Tail Rotor Teetering Bearings 2 places 30 Tail Rotor Pitch Change Bearing Sheet 8 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 69: ...ase Fitting 32 Cyclic Swashplate Bearing Grease Fitting 33 Cyclic Swashplate Control Rod Pivots Sheet 9 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 70: ...g Bearings 3 places 37 Main Rotor Feathering Bearings 6 places 38 Main Rotor Damper Service Plugs View Q 39 Main Rotor Lead Lag Bearings 3 places 40 Main Rotor Flapping Bearings 9 places Sheet 10 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of upd...

Page 71: ...ndling Wheel Bearing View S 43 Battery Servicing Points Forward left photo or aft right photo installation Sheet 11 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 72: ...s 45 Tail Rotor Control Bushings 4 places View U 46 Cabin Flight Control Bellcrank Pivot Bushings 11 places Sheet 12 of 12 Figure 4 1 Servicing Locations UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 73: ...g gear skids CAUTION Take care not to bend fiberglass fuel tanks by not allowing nozzle to bend filler neck CAUTION If fueling from drums or any questionable source of supply a clean funnel and a screen or filter should be used to remove any foreign materials B Remove the fuel cap from one of the fuel tanks and insert the fuel nozzle NOTE When the aircraft engine is hot service the right tank firs...

Page 74: ...ght fuel tank B Remove the fuel from the fuel tanks using a suitable pump or siphon and containers C Drain the remaining fuel from the tanks and lines into suitable containers using the tank sump drain valves and the gascolator drain valve D Reinstall the filler cap on the right fuel tank 4 6 Engine Oil System Figure 4 1 View C and View D 4 7 Servicing Engine Oil System NOTE Refer to Table 4 1 for...

Page 75: ...oil from the oil cooler and oil line I Reconnect the oil line 4 9 Overrunning Clutch Figure 4 1 View G 4 10 Servicing Overrunning Clutch NOTE Refer to Table 4 1 for system capacity and approved oil An alternate servicing procedure is described in step F A Rotate the upper pulley overrunning clutch until the service plugs in the clutch are in the horizontal and vertical positions Continue to rotate...

Page 76: ...and approved oils A The main transmission oil level is checked by a sight gauge located on the right aft side of the transmission The sight gauge is visible through an access panel in the baggage compartment or via the top step in the step access panel on the right side of the helicopter With the helicopter in a relatively level position the oil level should be at or near the halfway level in the ...

Page 77: ...t side ground handling wheel paragraph 4 67 C 2 Helicopters not equipped with MRGB chip detector and having a forward MRGB drain port Install a block 2 3 inches under the forward right skid plate and leave both ground handling wheels in the lowered position B Remove the left side upper access panel C Drain the transmission oil paragraph 4 13 D Remove the filler cap and tube assembly E Inspect the ...

Page 78: ...city and approved oils NOTE When the tail rotor transmission is properly serviced 5 oz 147 l the sight glass will be completely full The transmission oil level is serviceable until the oil level is at the center of the sight glass A Check the oil level of the transmission by using the sight plug located in the aft side of the transmission The transmission is serviceable until the oil level is at t...

Page 79: ...of the gearbox and flush any debris out of the gearbox Direct aim the sprayer around the inside of the gearbox to flush the input and output bearings while rotating the gearbox E Loosely install the bottom drain plug sight glass and fill plug F Add one half quart of the gear lube that is currently used in the gearbox Table 4 1 G Rotate the gears at least ten times to circulate the oil H Place a co...

Page 80: ...servoir before installing the plug 7 Tighten and lockwire 025 the plugs B Alternate method of servicing the dampers NOTE Do not cycle the blades back and forth during this procedure as it will mix any air that is in the reservoirs and distribute it through the damper 1 Slowly cycle the three blades in one direction until the damper piston is fully compressed 2 Remove all of the caps from the reser...

Page 81: ...o 450 lbs and the front oleos to 400 lbs In some circumstances individual oleo pressures may have to be adjusted to compensate for differences between individual helicopters and environmental factors The oleo struts should be serviced as pairs such that either both front or both aft oleos are serviced at the same time A Service the oleos using the following procedures 1 On 280FX models remove the ...

Page 82: ...eration the environmental conditions and determine whether more frequent lubrication intervals are necessary Refer to Tables 4 1 to 4 5 and Figure 4 1 for approved lubricants intervals and locations B Purge lubricate all bearings and remove the excess grease before performing the post maintenance ground run Follow the procedures listed below for lubricating the lower pulley jackstrut main rotor bl...

Page 83: ...ntil grease purges through the screw hole Install the screw 2 C Remove the purge screw 3 and pump grease into the grease fitting 1 until grease purges through the screw hole D Pump grease into the fitting 4 until grease purges through the screw hole Install the screw 3 E Pump grease into the grease fitting 4 until grease purges through the seal between the end of the grip and the spindle F Remove ...

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Page 85: ...n 21 12 Figure 4 2 Main Rotor Blade Grip Lead Lag Bearing and Flapping Bearing Lubrication UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 86: ...hypodermic needle inject 5cc of grease into the bearing in two places approximately 180q apart Carefully insert the tip of the needle under the lip of the seal where it contacts the inner race of the bearing The tip of the needle can be worked under the lip of the seal and into the bearing between the balls If the needle does not penetrate between the balls the needle can be withdrawn and inserted...

Page 87: ...tube Bearing Figure 4 1 View O 4 38 Lubrication Collective Guidetube Bearing A Purge lubricate the bearing via the grease fitting 4 39 Cyclic Swashplate Bearing Figure 4 1 View O 4 40 Lubrication Cyclic Swashplate Bearing A Purge lubricate the bearing via the grease fitting UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and...

Page 88: ...he needle can be worked under the lip of the seal and into the bearing between the balls If the needle does not penetrate between the balls the needle can be withdrawn and inserted in another position on the bearing B Wipe the excess grease from the surface of the seal as necessary 4 44 Lubrication Alternate Method Idler Pulley Bearings WARNING Use caution when removing the seal to prevent from in...

Page 89: ... 4 9 are on condition items B Overhaul cycle components authorized for installation on the F 28F 280F and 280FX must use the shorter overhaul cycle for the duration of the component overhaul cycle if the component is removed from one model of aircraft and installed on a model with a different overhaul cycle Table 4 9 Recommended Overhaul Cycles ITEM PART NUMBER OVERHAUL CYCLE F 28 280 Series Clutc...

Page 90: ...uire a mandatory daily maintenance inspection Owner Operators opting to have maintenance personnel check the aircraft should perform a pre flight check I A W the F 28F 280F or 280FX Rotorcraft Flight Manual 4 49 Periodic Inspection Checklists A These inspection checklists are intended for aircraft operating under normal condition More frequent inspections may be required should adverse operations ...

Page 91: ...gine inspections _________ D Check compliance with applicable engine Service Letters Service Bulletins and Airworthiness Directives _________ E Remove cowling and access panels as required to inspect the engine _________ 2 ENGINE A Inspect the engine in accordance with the Textron Lycoming O HO AIO HIO TIO 360 Series Operator s Manual 60297 12 _________ 3 FLIGHT CONTROLS A Verify the tail rotor pi...

Page 92: ...ss Directives _________ F Inspect the aircraft for evidence of fuel and oil leaks _________ G Clean the aircraft thoroughly _________ H Remove the following cowling access panels and components 1 Wrap around cowling top and sides _________ 2 Engine side panels _________ 3 Upper side panels _________ 4 Spark plug covers _________ 5 Cabin doors _________ 6 Seat deck _________ 7 Floor panels ________...

Page 93: ...mage proper operation and security of installation _________ 4 ENGINE A Inspect and service the engine in accordance with the Textron Lycoming O HO AIO HIO TIO 360 Series Operator s Manual 60297 12 _________ B Lubrication System 1 Drain the engine oil coolers I A W para 4 8 and inspect the oil cooler s for condition security of installation and obstruction of airflow _________ 2 Inspect the cooler...

Page 94: ..._________ F Turbocharger System 1 Inspect the turbocharger oil lines and fittings for leaks condition and security of installation _________ 2 Inspect the turbocharger support brackets for condition and security of installation _________ 3 Inspect the turbo inlet adaptor gasket condition and condition security of installation torque per SIL 0175 _________ 4 Inspect the exhaust pipe air induction p...

Page 95: ...trical System 1 Inspect the engine electrical wiring harness for chaffing condition proper clamping and security of installation _________ 2 Inspect the electrical component panel and components for condition and security of installation _________ 3 Inspect the engine to pylon ground strap for condition and security of installation _________ L Pylon Assembly 1 Inspect the pylon in the engine area ...

Page 96: ...t the crosstubes for damage worn or missing hardware and security of installation _________ 3 Inspect the crosstubes for excessive bowing 0 5 inch 12 7 mm while the aircraft is hanging and not sitting on ground _________ B Landing Gear Legs and Drag Struts 1 Inspect the landing gear legs and drag struts for cracks damage and security of installation _________ 2 Inspect the landing gear leg fairing...

Page 97: ... engagement bellcrank for loose or worn bushings condition and security of installation _________ 6 Inspect the clutch engagement cable for condition and security of installation _________ B Idler Pulley Assembly 1 Inspect the idler pulley support bracket for worn bushings cracks condition and security of installation _________ 2 Inspect the idler pulley yoke and shaft for cracks worn rod end bear...

Page 98: ...elt 1 Inspect the drive belt for cracks fraying missing sections and I A W SIL 0074 _________ F Pylon 1 Inspect the pylon in the belt drive area for corrosion cracks dents or other damage and condition of the protective primer epoxy coating _________ 7 TAIL CONE ASSEMBLY A Tail Cone 1 Inspect the tail cone bulkheads longerons stringers doublers and fittings for cracks dents and loose rivets ______...

Page 99: ... _________ 5 Inspect the main rotor tachometer drive belts and tachometer drive assembly for condition and security of installation _________ 8 TAIL ROTOR TRANSMISSION A Tail Rotor Transmission 1 Inspect the tail rotor transmission for seal leakage cracked damaged housing condition and security of plugs sight plugs and security of installation _________ 2 Drain the transmission and inspect the mag...

Page 100: ...corrosion damage cleanliness of sight glass and condition of installation hardware slippage marks _________ 2 Inspect the main rotor mast for corrosion nicks scratches or other damage _________ 3 Drain the transmission and inspect the magnetic pickup chip detector for metal particles _________ 4 Inspect the ring and pinion gears for wear and spalling _________ 5 Service the transmission _________ ...

Page 101: ... Hub Center Section 1 Inspect the hub center section for cracks nicks scratches corrosion and condition and security of hardware _________ 2 Inspect the upper and lower spline adapters for fretting _________ 3 Inspect the torque stripe indicators on the mast nut If the indicators show loss of torque on the mast nut or are not installed check the torque on the mast nut 410 ft lbs 556 Nm _________ F...

Page 102: ..._________ 4 Inspect the collective walking beam for cracks nicks scratches condition excessive wear at the pivot strap bushings and security of installation _________ 13 CABIN SECTION A Cabin Exterior 1 Inspect the cabin doors for proper operation condition and security of installation _________ 2 Inspect the windshield s cabin windows and door windows for cracks crazing and other damage _________...

Page 103: ...the heater controls for proper operation condition and security of installation _________ 14 FLIGHT CONTROLS A Cyclic Flight Controls 1 Inspect the cyclic flight controls for freedom of operation and proper range of travel Refer to paragraph 4 68 B _________ 2 Inspect the cyclic sticks control rods and bellcranks for condition excessively worn rod end bearings bushings and security of installation...

Page 104: ...Inspect the pedal assemblies control rods and bellcranks for excessively worn rod end bearings bushings condition and security of installation _________ 4 Inspect the tail rotor pitch change horn pitch change link assembly for condition and security of installation SDB 0125 _________ 15 BATTERY AREA A Battery 1 Inspect the battery as required in accordance with the manufacturer s instructions ____...

Page 105: ...e all switches and circuit breakers and inspect for proper operation condition and security of installation _________ I Inspect all other electrical equipment not specifically covered by this checklist for proper operation condition and security of installation _________ 17 POST INSPECTION A Lubrication and Servicing 1 Ensure all required items have been lubricated and serviced per the maintenance...

Page 106: ...o be performed by authorized personnel only _________ 3 Avionics and Flight Instruments Check operation _________ D Post Operation Check 1 Inspect the engine compartment for oil and fuel leaks _________ E Enter the inspection compliance in the airframe and engine logbooks as applicable _________ F Perform a maintenance test flight WARNING Test flight to be performed by authorized personnel only __...

Page 107: ...g deterioration _________ 4 Condition of the Lamiflex Nylatron straps _________ 5 Condition of the Lamiflex bearing shim installation Reference paragraph 9 4 A 16 and SDB 057 _________ 6 Evidence of O ring leakage _________ 7 Security of the spindle retention nut _________ 8 Evidence of a sheared roll pin at the hinge pin _________ 9 Evidence of ratcheting or binding of the flapping bearings _____...

Page 108: ... INITIAL EACH ITEM AFTER ACCOMPLISHMENT INITIAL 1 GENERAL INSPECTION A Perform a complete 100 Hour Annual Inspection _________ 2 ENGINE A Inspect the engine in accordance with the Textron Lycoming O HO AIO HIO TIO 360 Series Operator s Manual 60297 12 _________ UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register ...

Page 109: ...8F S N 744 and subsequent and all 280FX remove and disassemble the horizontal stabilizers and spar at the first 1200 hours of service and every 1200 hours of service thereafter for the inspection of the following NOTE Refer to Section 8 Paragraph 8 16 for complete disassembly assembly and inspection criteria 1 Visually inspect all components for damage cracks loose rivets and security of installat...

Page 110: ... All aluminum and steel components must be inspected by the following processes after visual inspection has revealed a possible defect or as noted in the special inspections 1 Aluminum machined or cast components are to be inspected by liquid penetrant inspection 2 Aluminum sheet metal components are to be inspected by liquid penetrant inspection 3 Steel components are to be inspected by magnetic ...

Page 111: ...pter Corporation for inspection and overhaul replacement 3 Remove the main rotor hub and inspect by liquid penetrant inspection and in accordance with the inspection tables in para 9 1 D or return to Enstrom Helicopter Corporation for inspection and overhaul replacement 4 Inspect all flight control push pull rods and torque tubes for sheared damaged rivets at the fittings damaged rod ends or shear...

Page 112: ...tion and overhaul replacement c Inspect the tail rotor assembly in accordance with the inspection tables in para 10 1 F 2 Replace all tail rotor driveshaft taper pins 3 Inspect the tail rotor driveshafts for complete or partial failure at the taper pin holes 4 Inspect the taper pin hole in the main rotor transmission pinion for complete or partial failure If damage is found return the main rotor t...

Page 113: ...e main rotor transmission mount bolt torque If torque is lost replace the hardware or remove and magnetic particle inspect the hardware 10 Inspect the main rotor transmission mount lugs with liquid penetrant method 11 Refer to the latest revision of Textron Lycoming Service Bulletin 533B for the recommended engine inspection 4 61 Main Rotor Overspeed Special Instruction A Overspeeds from 385 405 r...

Page 114: ...n chip indication Perform the following 1 Inspect the chip detector for accumulation of metal particles as follows a Main rotor transmission metal particles flakes or slivers exceeding 065 inch 1 65 mm Contact Enstrom Customer Service Department and discontinue use until further instructions are received from Enstrom Customer Service Department NOTE Sludge normally will not cause a chip indication...

Page 115: ...n or the input and output gears tail rotor transmission for cracks excessive pitting excessive spalling or hard wear lines 2 Remove the tail rotor assembly from the tail rotor transmission output shaft and the aft tail rotor drive shaft flex plate assembly Turn the tail rotor transmission output shaft by hand If indications of a rough bearing are felt the transmission must be replaced NOTE If the ...

Page 116: ...rs to the neutral position 2 Move the cyclic stick around the cyclic stop in the floor The stick must remain against the stop through the circle If binding or interference is detected re check the basic rigging 3 Move the fore aft trim to full forward position and move the cyclic stick full aft Stick should contact the cyclic stop Reverse the trim motor and stick positions and check that stick con...

Page 117: ... ground run for 3050 rpm 1 Manifold pressure 17 5 to 19 2 Operation of one way clutch 3 Rotor blades for out of track 4 Magneto check left right 5 Proper operation of all instruments 6 Proper operation of press to test lights 7 Proper operation of all avionics G Post Ground Run 1 Shut the aircraft down I A W the Rotorcraft Flight Manual 2 Record any discrepancies found during the ground run and no...

Page 118: ...DO NOT let go of the wheel bar handle while lowering or raising the ground handling wheels 2 Insert the wheel bar handle onto the lug on the ground handling wheel with the handle towards the aft end of the aircraft 3 Remove lock pin from the ground handling wheel 4 With a steady motion rotate wheel bar handle 180q towards the front of the aircraft and install lock pin when holes line up 5 Remove t...

Page 119: ...lowing the helicopter to rest on its skids B Install the main rotor tie down C Install static ground D Install the main rotor hub cover E Install the tail rotor gearbox and hub cover 4 70 Leveling WARNING Do not climb on or enter the aircraft while it is being leveled NOTE The tail of the aircraft may have to be supported to maintain the aircraft in a level attitude A Level the aircraft longitudin...

Page 120: ...ond reach from the ground two people and two steadying ropes will be necessary E Slowly hoist the aircraft using a steady lifting force 4 72 Cleaning 4 73 Exterior Cleaning NOTE The exterior of the aircraft is painted with a high quality paint Proper maintenance of this finish will provide corrosion protection as well as an attractive finish NOTE Do not wash the aircraft using pressure washing equ...

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Page 122: ... and dust from the cabin using a small broom or brush 2 Vacuum the interior to remove any remaining dirt 3 Use a good quality upholstery cleaner to remove dirt and grease from the seat cushions and the floor covering 4 75 Plexiglas Cleaning A Wash the Plexiglas using your bare hand or a clean soft cloth and a mild soap and water solution Rinse with clean water B Dry the surface with a soft clean c...

Page 123: ...d wax the helicopter prior to any type of storage 4 78 Low Usage Aircraft Preservation and Storage NOTE Aircraft flown for short periods several times a month NOTE Preserve the engine I A W the applicable Textron Lycoming Technical Publication if warranted by local corrosive conditions A Ground run the aircraft every 14 days until normal operating temperatures for the engine are obtained B Positio...

Page 124: ... NOTE Store the main rotor blades in a horizontal position on wood racks cut out to the contour of the leading edge of the blades Use care in handling the blades to prevent damage to the blades and trim tabs D Return the aircraft to service using the following procedures 1 Remove all covers and tiedowns 2 Connect the battery 3 Install the main rotor blades 4 Perform a preflight inspection NOTE Whe...

Page 125: ...age A Complete steps A and B of paragraph 4 80 B Hangar the aircraft C Return the aircraft to service using the following procedures 1 Remove all covers tiedowns and shields 2 Service the battery I A W the manufacturer s instructions Install and connect the battery 3 Install the main rotor blades 4 Perform a 100 hour periodic inspection and lubricate I A W the 100 hour requirements NOTE The aircra...

Page 126: ...n Section 9 of this manual for the inspection and repair procedures for the main and tail rotor blades In coastal areas or wherever the air has a high moisture content blade tape can be installed on the leading edge of the main rotor blades to help prevent the leading edge and bond line corrosion from occurring In coastal areas it is recommended that the blade tape be installed when the aircraft i...

Page 127: ...er weekly 2 Wax the aircraft every second week C Aircraft that are operated in arid moderate or cold regions Use the following procedures NOTE This procedure may be suspended during cold or winter months if step 3 was accomplished prior to the cold season 1 Flush with fresh water weekly 2 Wash the aircraft with mild soap and fresh water monthly 3 Wax the aircraft every second month UNCONTROLLED CO...

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Page 148: ...ly sense electrical overloads in the aircraft which cause excessive battery current drain This system consists of fuse FIB overcurrent breaker CB17 and the overcurrent trip breaker CB16 on the instrument panel Circuit breaker CB17 located at the aircraft battery senses the overload condition simultaneously trips the dash mounted overcurrent breaker CB16 and deactivates the master relay The action ...

Page 149: ...ed in solvent NOTE It is recommended that the service manual applicable to your alternator type be consulted for detailed repair procedures C Alternator Removal see Figure 6 1 1 Disconnect battery cables 2 Remove cowling and baggage box 3 Remove jackstrut and pulley assembly See Section 11 4 for Jackstrut Removal Procedure 4 Remove the fan assembly exposing the alternator 5 Remove the four bolts a...

Page 150: ... 2 Place v belt on alternator pulley and install bolt through the belt tension arm CAUTION Connect the ground wire to case ground Do not connect it to the AUX terminal 3 Connect wires to the alternator as previously marked 4 Tighten alternator attachment bolts to take out clearance but allow movement for adjusting tension NOTE Check attachment per wiring schematic 5 Pivot alternator and adjust bel...

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Page 191: ... MM 8 13 Repair Door MM 8 13 Installation Door MM 8 13 Removal Glass MM 8 13 Installation Glass MM 8 15 280F Series Cabin Door Removal Door MM 8 16 Inspection Door MM 8 16 Repair Door MM 8 16 Installation Door MM 8 16 Installation Glass MM 8 16 8 5 Reserved Original content incorporated into Paragraph 8 4 8 6 Reserved Original content incorporated into Paragraph 8 2 8 7 Seat Belts Lap Type MM 8 17...

Page 192: ...Installation MM 8 39 Inspection MM 8 39 Repair MM 8 39 8 11 Baggage Compartment MM 8 39 Removal MM 8 39 Inspection MM 8 41 Repair MM 8 41 Installation MM 8 41 8 12 Tailcone Assembly MM 8 42 Removal MM 8 42 Inspection MM 8 42 Repair MM 8 42 Installation MM 8 42 8 12 1 Tubular Tail Rotor Guard F 28F Post 1986 280FX MM 8 44 Removal MM 8 44 Inspection MM 8 44 Installation MM 8 45 8 12 2 Tail Rotor Dri...

Page 193: ... MM 8 49 Inspection MM 8 50 Installation MM 8 50 8 16 Horizontal and Vertical Stabilizers F 28F Post 1986 280FX MM 8 50 Removal MM 8 50 Inspection MM 8 51 Installation MM 8 51 Assembly Endplate MM 8 51 8 17 Airscoop 280FX MM 8 59 Removal Access Upper Drive System Main Rotor Gearbox Removal MM 8 59 Installation MM 8 59 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for...

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Page 195: ...e walking beam at the cabin firewall 5 Disconnect the lateral and longitudinal cyclic push pull rods at bellcranks on each side of cabin wall 6 Disconnect the main battery cable inside the engine compartment 7 Drain fuel from both fuel tanks and remove tanks NOTE Install plugs in fuel line fittings 8 Disconnect tail rotor control cables at turnbuckle in the engine compartment See Section 10 7 9 Di...

Page 196: ...floor to the keel structure C Cabin Repair 1 Replace damaged or missing hardware 2 Repair damage to the cabin shell cockpit bulkhead or the cockpit floor I A W AC 43 13 1B Contact Enstrom Helicopter Corporation Customer Service for detailed damage and repair limitations D Cabin Installation 1 Lift cabin and align with pylon mounts Install the six attachment bolts Torque bolts See Figure 8 1 NOTE T...

Page 197: ... NOTE Some installations may be shimmed at point B bottom Figure 8 1 Cabin Assembly Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 198: ...ck all flight controls for proper operation Check all items on the Daily Check List and complete a Preflight Inspection See Section 3 Inspections and Routine Checks 19 Install cowling and engine compartment doors 20 Install fiberglass seat deck and cabin doors 8 2 WINDSHIELDS AND WINDOWS A Windshield and Window Inspection 1 Inspect the windshields and windows for cracks crazing pits and scratches ...

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Page 200: ... with acetone 2 Position new windshield over cabin and apply tape to temporarily hold windshield in place 3 Apply 1 4 masking tape following contour of windshield and recessed area of cabin to mark windshield size for cutting 4 Remove windshield and cut to size on a fine wavy tooth bandsaw or a die grinder with a 1 16 inch cut off wheel 5 Sand edges on belt sander for final fit to cabin NOTE Check...

Page 201: ...echanical fasteners 14 Install door hinges in position as previously marked in removal procedure 15 Install compass to windshield as follows see Figure 8 2 a Install compass to windshield from middle rib of lower door hinges and mark centerline of windshield with a grease pencil NOTE Use cloth type measurement tape if possible to prevent scratching plexiglass b Measure up 24 from bottom edge of wi...

Page 202: ...F Windshield Installation 280F Series See Figure 8 3 1 Clean recessed windshield area of cabin frame with acetone or equivalent 2 Position new windshield over cabin and apply tape to temporarily hold windshield in place NOTE Use care in aligning windshield to recess in cabin as the plexiglass is formed with a slight indentation along outer edge that must be matched to cabin frame 3 Apply 1 4 maski...

Page 203: ...E MANUAL Rev 8 MM 8 9 Sep 20 17 Figure 8 3 280F Series Windshield UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 204: ... position and press firmly against adhesive 12 Temporarily install mechanical fasteners clecos to hold windshield in position until PR 1425 B 2 or equivalent is set up CAUTION Allow adhesive to dry approximately 24 hours before installing rivets to prevent cracking glass 13 Run a 30 drill through rivet holes to remove bonding adhesive 14 Drill through all existing rivet holes in plexiglass with a ...

Page 205: ...abin NOTE Check fit to cabin and re sand as required 7 Clean outer edge of window with acetone 8 Remove paper backing from foam tape and install window in position Press firmly against tape 9 Match drill to old rivet holes in cabin using a 30 drill or drill new holes through window and cabin at midpoints between old holes NOTE Drill bits can be ground to a very sharp point to aid in drilling plexi...

Page 206: ...ANCE MANUAL Rev 8 MM 8 12 Sep 20 17 Figure 8 4 F 28F Cabin Door UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 207: ...Attach lower bungee 1 or gas spring if equipped with screw 9 at the forward corner of the door frame 3 Check operation of the door latch and upper and lower retaining lugs E Door Glass Removal F 28F See Figure 8 4 NOTE For installation of door glass on later F 28F model doors S N 744 and subsequent refer to the Enstrom Helicopter Corporation website 280FX Technical Tips for replacing the door glas...

Page 208: ...E MANUAL Rev 8 MM 8 14 Sep 20 17 Figure 8 5 280F Series Cabin Door UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 209: ...ugh cut to size Final sanding of plexiglass to door frame is completed after bonding procedure is done 2 Remove door glass from frame and clean bonding surfaces of both items using acetone or equivalent 3 Apply bonding adhesive PR 1425 B 2 or equivalent to bonding surface of door frame Spread adhesive approximately 1 8 to 3 16 thick 4 Carefully install door glass on door frame NOTE Install enough ...

Page 210: ...tion Customer Service for detailed damage and repair limitations 2 Replace the seal strips around the door if deteriorated or damaged Attach the new seal using trim adhesive 8031 3M or equivalent 3 Replace components of the door latching assembly that are unserviceable J Door Installation 280F Series See Figure 8 5 1 Align bottom pivot peg 4 on lower corner of door with hole in cabin door frame an...

Page 211: ...s to insure belt security b There are four structural attach points to accommodate two and three passenger configurations 1 left rear cabin wall 2 right of left center seat beam 3 right of right center seat beam and 4 right rear cabin wall c Secure belts to the airframe by applying downward pressure on the structural attach point with the latch portion of the belt attachment mechanism until it loc...

Page 212: ...uctural attach point right of right center seat beam See Figure 8 6 Point C NOTE Install on right side of center seat position belt if installed b Attach seat belt half with flat tab to right rear cabin wall structural attach point See Figure 8 6 Point D 8 8 SEAT DECK ASSEMBLY A Seat Deck Removal 1 Remove seat cushions and seat belts 2 Disconnect cyclic stick canon plugs and remove cyclic boots 3 ...

Page 213: ... clutch engagement lever and into position Secure in place with attachment screws 2 Install co pilot s collective stick into bellcrank and secure with expando pin NOTE Flip expando pin lever down and check security 3 Install handles in clutch engagement lever and screw together to secure 4 Install fiberglass cover over collective push pull rod at top of seat deck and secure with screws 5 Install f...

Page 214: ...UAL Rev 8 MM 8 20 Sep 20 17 Figure 8 7 Landing Gear to Pylon Attachment UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 215: ...additional inspection criteria for the pylon attachment clamps 1 Cross tubes with bows up to 0 5 inches 12 7mm are serviceable Replace cross tubes with bends cracks or elongated bolt holes 2 Replace end caps that are cracked or the bolt holes are elongated Repair pylon attachment aft cross tube or gear leg attachment clamps that are cracked by welding I A W AC 43 13 1B Replace pylon attachment aft...

Page 216: ...UAL Rev 8 MM 8 22 Sep 20 17 Figure 8 8 Landing Gear Assembly Breakdown UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 217: ...G Approximately 135 lbs of force is exerted through the wheel bar when raising or lowering wheels It is important that the wheel bar does not slip off the end of the axle or the operator does not lose his grip on the handle particularly when removing or replacing the lock pin or possible injury could result a To lower the wheels the slot in the end of wheel bar should be inserted on the axle with ...

Page 218: ...bly 3 on axle 4 and secure with washer 2 and nut 1 b Inflate tire to 75 psi CAUTION Wheel assembly must be secured on axle before inflating tire to prevent possible separation of the rim c Apply lubriplate to axle and slide axle in mount bracket on skid tube with wheel in raised position d Install retaining pin 5 and secure with washer 6 and snap ring 7 Rotate retaining pin ring down and around th...

Page 219: ...UAL Rev 8 MM 8 25 Sep 20 17 Figure 8 9 Ground Handling Wheel Operation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 220: ...8 MM 8 26 Sep 20 17 Figure 8 10 Ground Handling Wheel Removal and Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 221: ...vise by the ears at the bottom of the cylinder Use tool T 0169 1 d Install tool T 0035 on the seal housing assembly 6 and T 0169 1 between the ears to unscrew the seal housing from the cylinder e Slowly pull piston assembly out of cylinder assembly f Lay piston shaft assembly with edge of piston 13 on a block of wood and using a flat punch remove dowel pin 12 CAUTION Use care in removing dowel pin...

Page 222: ...1 4 Oleo Strut Assembly See Figure 8 12 a Assemble piston assembly 13 if required as follows See Figure 8 12 View B 1 Carefully press shafts 20 into the piston 19 CAUTION If excessive pressure is used to press shafts into the piston damage to the valve area of the piston can result 2 Install valve pistons 17 and springs 18 on the shafts 3 Install washers 16 and nuts 15 4 Adjust the valve and sprin...

Page 223: ... MANUAL Rev 8 MM 8 29 Sep 20 17 Figure 8 11 Oleo Strut Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 224: ...CE MANUAL Rev 8 MM 8 30 Sep 20 17 Figure 8 12 Oleo Strut Assembly UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 225: ...NANCE MANUAL Rev 8 MM 8 31 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 226: ...ce piston shaft Dowel pin hole dia 2490 to 2495 0005 Not repairable Replace piston shaft Threaded boss no crossed or missing threads None allowed Not repairable Replace piston shaft 28 17158 Fig 8 12 Item 3 Oleo Boot Check for cracks or tears None allowed Not repairable Replace boot 28 17144 Fig 8 12 Item 6 Guide Shaft Assembly Threads no crossed or missing threads None allowed Not repairable Repl...

Page 227: ...re dia 1 7655 to 1 7645 001 Not repairable Replace cylinder Threads no crossed or missing threads None allowed Not repairable Replace cylinder Mount holes in ears 312 diameter 001 Not repairable Replace cylinder 28 17145 Fig 8 12 Item 19 Piston O D dia 1 763 to 1 762 001 Not repairable Replace piston Pin hole 2495 to 2490 002 Not repairable Replace piston Check for scratches in O D None allowed 00...

Page 228: ...the piston shaft 2 CAUTION Notches in the rebound rings must be staggered g Align the flow passage port on the inner edge of the piston assembly 13 to the flow passage hole in the piston shaft 2 and install the piston assembly h Secure valve to the piston shaft with dowel pin 12 CAUTION The ends of the dowel pin must be seated below the O D surface of the piston to prevent possible binding on inst...

Page 229: ...en the air valve and remove the hose r Torque the guide assembly using T 0169 1 Using the index mark torque the guide assembly to the cylinder assembly by turning the index mark on the cylinder assembly approximately inch past the index mark on the guide assembly NOTE The oleo may be pressurized before or after installation in the helicopter If the oleo is not installed pressurize to 200 psi 1 379...

Page 230: ...attachment hardware until it requires 2 lb force to swing the oleo strut assembly in and out and fore and aft 2 Use a beam type in lb torque wrench to record the torque on the nut that is installed on the bolt facing aft 3 Place a light washer on each side of the universal link and connect the bottom universal block to the landing gear leg 4 Remove the hardware connecting the top of the oleo to th...

Page 231: ... upward to expose oleo valve for required servicing see Section 4 20 Item 1 2 Removal Access for Oleo Strut Removal a Proceed with paragraph 1 steps a and b b Remove 2 screws 10 front and back top and bottom of oleo fairing 2 c Slip rubber boot 4 at bottom of fairing 2 downward to clear attaching screws d Remove screws 5 from trailing edge of fairing 2 e Spread fairing 2 carefully to clear oleo an...

Page 232: ...ement a Reverse procedures in paragraph 2 and paragraph 1 b Check for proper security Figure 8 12 1 Landing Gear Fairings 280FX UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 233: ...tubes can be repaired in accordance with FAR 43 Special care must be taken during such repairs as not to distort the structure Remove minor surface corrosion and paint the area using MIL PRF 23377 primer or equivalent Repair limit 10 wall thickness e g 0035 for a 035 thick wall 8 11 Baggage Compartment A Baggage Compartment Removal See Figure 8 13 1 Remove baggage compartment door as follows See F...

Page 234: ...AL Rev 8 MM 8 40 Sep 20 17 Figure 8 13 Baggage Compartment Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 235: ...e and repair limitations D Baggage Compartment Installation See Figure 8 13 1 Slide baggage compartment into pylon structure 2 Install bolt 6 in lower left aft corner of baggage compartment Torque bolt and safety using 032 safety wire 3 Install bolt 7 through mount strap and baggage compartment at lower left forward corner Torque bolt 4 Install screws 5 securing front of baggage compartment to pyl...

Page 236: ...uselage of tailcone to support it during removal Remove the three attachment bolts 5 and washers 6 securing tailcone to pylon and remove tailcone NOTE If any shims are found they must be used at same points with new tailcone If the tailcone was replaced the tailcone alignment must be checked and shimmed accordingly NOTE Use care in removal procedure to prevent possible damage to tail rotor assembl...

Page 237: ...E MANUAL Rev 8 MM 8 43 Sep 20 17 Figure 8 14 Tailcone Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 238: ...ity 9 Install wrap around cowling NOTE If any area of tail rotor assembly tail rotor drive shaft or tail rotor transmission was worked on see Section 10 for correct installation procedures 8 12 1 TUBULAR TAIL ROTOR GUARD F 28F 280FX A Tail Rotor Guard Removal See Figure 8 12 2 1 Remove bolt 13 and associated hardware 14 15 remove clamp 12 2 Remove bolts 16 and 23 with associated hardware 17 18 3 R...

Page 239: ...on and servicing the driveshaft and bearings See Figure 8 14 1 A Cover Opening for access to the tail rotor drive shaft 1 Unfasten the turn fasteners 1 thru 4 2 Lift section 7 up from left side and over 3 Repeat same procedure for section 8 and 9 NOTE This will allow the required access to lubricate the tail drive bearing pillow blocks the aft two pillow blocks are accessible without removing sect...

Page 240: ...emove the bolts from torque tube clamp 5 4 places Remove the torque tube 6 by pulling aft with a slight rotating action B Torque Tube Extension Inspection 1 Inspect the extension tube for corrosion cracks dents nicks scratches elongated bolt holes condition and security of the nutplates installed in the end of the tube and security of the installation 2 Inspect the extension tube mounting clamp fo...

Page 241: ...p 20 17 Figure 8 14 1 Tail Rotor Driveshaft Cover 280 FX Figure 8 15 Torque Tube Extension UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 242: ...ll the left horizontal stabilizer on F 28F model helicopters See Section 8 14 or 8 16 Stabilizer Installation as applicable 8 Install and secure the tail rotor guard 1 on F 28F and 280 FX model helicopters 9 Check tail rotor rigging See Section 10 1 Tail Rotor Assembly 10 Inspect all connections for security 8 14 HORIZONTAL STABILIZERS F 28F Pre 1986 A Stabilizer Removal See Figure 8 16 1 Remove s...

Page 243: ...par 3 6 Align bolt holes in the stabilizer to the holes in the spar and install bolts 2 in each stabilizer Torque bolts NOTE When installing a new stabilizer and spar proceed as follows a Lubricate and install spar in the tailcone Secure with bolt 4 b Lubricate O D of the spar and slide the stabilizer in position c Align pre drilled pilot holes 41 drill size in the stabilizer to pilot holes in the...

Page 244: ...es are constructed from fiberglass over foam cores with the anticollision and navigation lights mounted on the outboard side of each end plate Ref Figure 8 18 A Stabilizer Removal 1 Remove trailing edge tab screw 6 and washer 7 2 Remove one through bolt 8 at the outermost end of the spar 3 and washer 9 and nut 10 3 Loosen the two internal wrenching bolts 20 located under the inboard removable skin...

Page 245: ...itting is in alignment with the retainer nut plate in the tail cone and the aft tab screw can be installed 6 Install screw 6 and washer 7 7 Install the spar clamp mount bolts 1 at two places torque 50 70 in lb 5 6 7 9 Nm and safety wire 8 Install the screws 20 and washers 26 on underside and tighten NOTE In some cases an additional washer 7 shim may be required under fitting to reduce bending 9 In...

Page 246: ...NANCE MANUAL Rev 8 MM 8 52 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 247: ...ote Replace bushing Replace stabilizer See Note 28 11222 3 Cross Spar O D 1 125 1 129 dia Bolt holes 189 dia 005 Spar surface check for nicks scratches cracks 0005 002 None allowed Not Repairable Not Repairable Not Repairable Replace spar Replace spar Replace spar NOTE Structural repairs to be made in accordance with AC 43 13 1B Contact the Enstrom Helicopter Corporation Customer Service for detai...

Page 248: ... Not Repairable See Note Replace stabilizer See Note Replace lens cover 280 200000 Not Illustrated Spar Bolt holes 189 dia 005 Spar surface check for nicks scratches cracks 002 None allowed Not Repairable Not Repairable Replace spar Replace spar NOTE Structural repairs to be made in accordance with AC 43 13 1B Contact the Enstrom Helicopter Corporation Customer Service for detailed damage and repa...

Page 249: ...lowed Repairable Note See Note Not repairable Replace stabilizer See Note As required replace fittings Replace Endplate 28 11222 Figure 8 18 Item 3 Cross Spar O D 1 125 1 129 diam Bolt holes 189 dia 005 Spar surface check for nicks scratches cracks Corrosion Pits 0005 002 None allowed 005 in depth Not Repairable Not Repairable Not Repairable Replace spar Replace spar Replace spar Blend out and pro...

Page 250: ...washers to equal gap between stabilizer and tailcone Figure 8 16 Horizontal Stabilizer Installation F 28F Pre 1986 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 251: ...with washers to equal gap between stabilizer and tailcone Figure 8 17 Horizontal Stabilizer Installation 280F UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 252: ...20 17 Figure 8 18 Tubular Tail Rotor Guard and Vertical Stabilizers F 28F Post 1986 and 280FX UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 253: ...riveshaft cover Ref Figure 22 1 A Removal For Access to the Upper Drive System or for Main Rotor Gearbox Removal 1 Remove side cowl 9 and opposite side panel 10 then remove 5 each screws 4 on the forward section of airscoop 6 and lift airscoop off 2 Remove screws 2 4 places from center duct 7 and nose piece 8 3 Remove screws 3 from either side of the center duct and remove NOTE The nose piece 8 ne...

Page 254: ...ANUAL Rev 8 MM 8 60 Sep 20 17 Figure 8 19 Three Piece Airscoop 280FX UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 255: ...g velocity of the blades B Main Rotor Hub Removal 1 Remove the main rotor blades para 9 8 CAUTION Foreign objects dropped down the mast must be immediately removed to prevent damaging the flight controls 2 Remove the bolts 3 securing the pitch change bellcranks to the push pull rods in the mast Figure 9 2 3 Remove the center pivot bolts 4 from the pitch change bellcranks Lift the bellcranks from t...

Page 256: ...ly NOTE Mark all parts for reassembly in the same respective positions 1 Remove the pitch links 2 and the walking beams from the pitch horns 1 Figure 9 1 2 Remove the pitch horn 1 from the blade grip 3 Remove the damper as follows Figure 9 5 a Remove cotter pin 14 nut 13 and washer 12 b Remove bolt 11 and washer 12 c Pivot damper to remove spacers 15 on top and bottom of damper rod end d Remove nu...

Page 257: ... them from the hub plates with a nylon drift 12 Remove the dowel pins 13 from the hub plates 14 and 17 and the center spacer 16 by tapping them through with an aluminum drift 13 Remove the grease fittings 19 from the hub plates 6 places WARNING Use extreme caution when removing or installing the blade and grip assemblies to prevent from injuring personnel WARNING Use protective gloves when handlin...

Page 258: ...6 Figure 9 1 Pitch Link Attachment to Pitch Arm Figure 9 2 Walking Beam Removal and Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 259: ...taining Nut 14 Upper Hub Plate 23 DU Washer 6 Lock Washer 15 Universal Block 24 Spacer 7 DU Washer 16 Center Spacer 25 Shim 8 Shim 17 Lower Hub Plate 26 Hub Spacer 9 Retaining Nut 18 Lower Spline Adapter 27 Retaining Nut Figure 9 3 Main Rotor Hub Assembly UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for em...

Page 260: ... or right side of the universal block 1 DU Washer 4 Lock Washer 2 Shim 5 Nut 3 Flapping Hinge Pin 6 Retention Assembly Figure 9 4 Retention Assembly Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 261: ...t 12 Washer 8 Chamfered Washer 13 Nut 9 Washer 14 Cotter Pin 10 Nut 15 Spacer 11 Bolt Figure 9 5 Damper Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 262: ...re 9 6 Flapping Bearing and Spindle Dimension Check Figure 9 7a Forward Flapping Bearing Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 263: ... 7b Aft Flapping Bearing and Spacer Installation Figure 9 7c Flapping Bearing Installation Alignment Tool UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 264: ...28 14227 5 Nut Threads rolled or missing None Allowed Not Repairable Replace Nut W 09 6 Lockwasher Tangs deformed or cracked None Allowed Not Repairable Replace Lockwasher 28 14236 7 DU washer Flatness Thickness 090 to 093 005 003 Not Repairable Not Repairable Replace Washer Replace Washer 28 14256 9 Nut Threads rolled or missing None Allowed Not Repairable Replace Nut 28 14223 16 Spacer Dowel Hol...

Page 265: ...ine wear Nicks scratches or corrosion Cracks 0025 FIM 0005 003 Deep None Allowed 0015 on Side 010 Deep None Allowed Not Repairable Not Repairable Not Repairable Surface Corrosion Not Repairable 010 Deep Not Repairable Replace Adapter Replace Adapter Replace Adapter Wire Brush to Remove Replace adapTer Blend and Polish Smooth Replace Adapter 28 14280 14 Upper Hub Spline Adapter Bore 3 624 to 3 625 ...

Page 266: ...pairable Replace Upper Hub Replace Bushing Replace Helicoil Blend and Polish Out Smooth Replace Upper Hub 28 14281 18 Lower Hub Spline Adapter Bore 3 624 to 3 625 U Block Bearing Bores 2 4986 to 2 4994 Recesses for the DU washers parallel to the lower surface within 001 Damper Bolt Bushing Dia 4995 to 5000 Nicks scratches or corrosion Cracks 0005 0008 0005 0005 None Allowed None Allowed Not Repair...

Page 267: ...6 23 DU Washer Flatness Thickness 090 to 093 005 003 Not Repairable Not Repairable Replace Washer Replace Washer 28 14117 24 U Block Bore Dia 2 4988 to 2 4996 Bearing Surface O D 1 7488 to 1 7494 Bearing Surfaces concentric Threads crossed or missing Nicks scratches or corrosion Cracks 0002 0002 001 FIM None Allowed None allowed at the radius of the bearing spindle None Allowed Not Repairable Not ...

Page 268: ... scratches Radial Scores None Allowed 0015 0005 011 deep None Allowed Not Repairable Not Repairable Not Repairable 011 deep Not Repairable Replace Pin Replace Pin Replace Pin Blend and polish out smooth Replace Pin 28 14233 3 Fig 9 4 Item 3 Flapping Pin O D 1 7488 to 1 7494 0005 Not Repairable Replace Pin Inspect the remainder of the flapping pin following the inspection criteria listed for the 2 ...

Page 269: ...before installing a new nylatron strap 8 Remove O ring 12 and DU washer 11 from spindle 9 Remove retainer ring 10 from groove in main rotor spindle 3 10 Remove the hinge pin alignment roll pin from ear of spindle by tapping from the inside out with a small punch do not drive through 11 Install press tool between seal 6 and bearing 7 on spindle 12 Place in hydraulic press and press bearings 7 and 9...

Page 270: ... Threads crossed or missing Nicks scratches or corrosion Cracks 002 0003 0003 002 0005 None Allowed None Allowed None Allowed Not Repairable Not Repairable Not Repairable Not Repairable Not Repairable Not Repairable 010 deep Not Repairable Replace Spindle Replace Spindle Replace Spindle Replace Spindle Replace Spindle Replace Spindle Blend and polish out smooth Replace Spindle 28 14231 1 4 Up Stop...

Page 271: ...to 2 0000 Ratcheting or roughness No Tolerance Allowed No Tolerance Allowed None Allowed Not Repairable Not Repairable Not Repairable Replace Bearing Replace Bearing Replace Bearing 28 14313 11 DU Washer Thickness 090 to 093 003 Not Repairable Replace Washer 28 14279 13 Blade Grip Blade retention bolt bore Dia 875 to 876 Large bearing bore Dia 3 2512 to 3 2522 Small bearing bore Dia 2 7511 to 2 75...

Page 272: ...for flatness Threads rolled or missing 0015 None Allowed Not Repairable Not Repairable Replace Nut Replace Nut 28 14007 19 Blade Retention Bolt O D 8738 to 8745 0002 Not Repairable Replace Bolt Note Lamiflex bearings that are found swelled from grease contamination should be cleaned with denatured alcohol and checked for delamination If the bearing is swelled beyond the limits 790 thick they may s...

Page 273: ...64 to 566 Retention bolt hole Dia 2 places 3745 to 3750 Nicks scratches or corrosion Cracks 001 0005 0002 None Allowed None Allowed Not Repairable Not Repairable Not Repairable 010 deep Not Repairable Replace Link Replace Link Replace Link Blend and polish out smooth Replace Link 28 14278 21 Pitch Arm Pitch change link bolt and mount bolt hole Dia 5 places 312 to 315 Nicks scratches or corrosion C...

Page 274: ...he bearings and the spacer to create a zero tolerance fit 4 Grease the bearings prior to installation NOTE Use an arbor press to install the flapping bearings if the main rotor hub is disassembled If the main rotor hub is assembled use the Universal Block Bearing Tool T 0151 1 to install the flapping bearing Refer to Figure 9 7a b for the use of tool T 0151 1 5 Lubricate MIL PRF 81322 the bore of ...

Page 275: ...e in the bearing 6 Apply lubrication to bearing surface and press bearing 7 onto spindle using a plastic mallet 7 Install spacer 8 on spindle 8 Lubricate MIL PRF 81322 bearing surface and press bearing 9 onto spindle using a plastic mallet NOTE Be sure bearings 7 and 9 are seated firmly against shoulders of spindle 9 Install retainer ring 10 in groove of spindle 10 Install DU washer 11 on spindle ...

Page 276: ... Improper alignment of these shims can cause wear to the inner surfaces of the main rotor blade grip Figure 9 9 19 Install the nut 16 on the spindle and tighten until finger tight 20 Install the cotter pin 17 after the nut 16 has been properly shimmed and torqued Bend the cotter pin ends to secure CAUTION To prevent lamiflex bearing damage do not over rotate the grip with the pitch change links di...

Page 277: ...latron Strap 16 Retaining Nut 6 Seal 17 Cotter Pin 7 Bearing 18 Dust Cover 8 Spacer 19 Blade Retention Pin 9 Bearing 20 Drag Link 10 Retaining Ring 21 Pitch Horn 11 DU Washer Figure 9 8 Retention Assembly UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 278: ...NUAL Rev 7 MM 9 24 Aug 22 16 Figure 9 9 Lamiflex Bearing Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 279: ...f the U blocks down 3 places 4 Place the spacer 16 on the lower hub plate and align the bolt holes NOTE Ensure the DU washers are seated in the recessed areas of the upper hub plate 5 Lubricate the bearing bores of the upper hub plate and install the upper hub plate onto the U blocks NOTE The dowel pins must be installed until slightly recessed from face of hub plate surface 6 Lubricate the dowel ...

Page 280: ... hub assembly on a stand with lower end of U blocks up b Install DU washer 7 into recess of hub plate with chamfer in board toward hub plate c Install approximately 0 025 shims 8 and lower U block nut 9 Using tool T 0003 torque nut to 50 ft lbs 67 8 Nm d Rotate U block to one of the stops and install a hinge pin partially into bearing until it extends 4 75 in 12 1 cm e Attach a spring scale to hea...

Page 281: ...orqued to 20 ft lbs 27 1 Nm d Bend tab from lock washer 6 into slot in nut 5 to secure nut after torque is completed e Install dust cover 4 on nut and secure with screws and washers f Repeat steps a through e on each U block 15 Install grease fittings 19 into upper and lower hub plates 6 places UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order a...

Page 282: ...retention assemblies after the flapping bearings have been shimmed The Flapping Hinge Pin P N 28 14233 3 is manufactured to closer tolerances for bearing fit and will improve service life Flapping Hinge Pin P N 28 14233 1 is an acceptable alternate and serviceable pins may be reinstalled 5 Twist the grip slightly to allow the hinge pin 3 to be installed do not over twist to avoid damaging the lami...

Page 283: ...ion at 150 ft lbs 203 4 Nm Remove one shim and verify the flapping bearing moves freely 10 Secure the nut by bending one of the tabs on the lockwasher 4 into a slot in the nut 11 Lubricate the retention assembly para 4 28 12 Install the main rotor damper para H connect the pitch change link to the pitch change bellcrank and the pitch horn and install the main rotor blade para 9 13 NOTE Paragraph G...

Page 284: ...NTENANCE MANUAL Rev 7 MM 9 30 Aug 22 16 Figure 9 10 Deleted UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 285: ...r pin hole Install cotter pin 9 Torque inboard damper bolt to 190 in lbs 21 5 Nm 10 Install washer and locknut on center walking beam bolt Torque nut and install cotter pin I Main Rotor Hub Installation See Figure 9 1 1 Locate the spline with phasing mark at top of main rotor shaft and mark it with a black felt marker for alignment ease Apply No Lok anti seize compound to the rest of the rotor sha...

Page 286: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 287: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 288: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 316: ...ion coating is only required if the bare metal is exposed on the main rotor blade WARNING Use the proper protective equipment when working with the metal prep Observe the precautionary information and instructions provided with the metal prep 4 Treat the repaired area of the blade with a metal prep Flush thoroughly with fresh water and allow to dry WARNING Use the proper protective equipment when ...

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Page 318: ...y 180 200 F 82 93 C to evacuate any residual moisture 4 Apply corrosion inhibitor and allow to dry for 30 minutes 5 Wipe the area with denatured alcohol Extreme Simple Green or equivalent 6 Seal the area with Hysol Type EA 9309 2NA epoxy sealant 7 Refinish the area in accordance with paragraph 9 10 A above or paragraph 9 11 depending on the paint condition of the rest of the blade 8 Enter into the...

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Page 329: ... good coverage 1 Apply two coats to the spar and feather the coats past the spar to skin bond lines Apply two coats to the trailing edge straight on Apply the third coat to the whole blade 2 The application is the same for the tail rotor blades except that the whole blade gets all three coats I Paint the finish coat with any good quality flat or satin finish polyurethane paint CAUTION Refinishing ...

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Page 343: ...lid link barrel or rod end if cracked or damage exceeds 0 010 inch 0 25 mm deep Replace the rod end if its axial play is exceeds 0 005 inch 0 13 mm NOTE Steps 3 through 6 and 10 apply to the barrel type pitch change links only 3 Install lock nuts on rod ends 4 Apply VC 3 Loctite to threads of rod ends 5 Turn right hand rod end into barrel until threads completely cover the witness hole in the barr...

Page 344: ...re 10 2 and Figure 10 3 9 Adjust length of assembly by rotating barrel until pitch link assembly measures 4 260 inch 0 005 inch 10 82 cm 0 13 mm Holding barrel with wrench tighten lock nuts in place Recheck length of assembly to be sure it is still 4 260 inch 0 005 inch 10 82 cm 0 13 mm CAUTION Using a piece of 0 025 safety wire insert wire in witness hole of barrel to be sure right hand thread ro...

Page 345: ...rper Washer 3 Spacer 9 Spacer 4 Pitch Change Link Rod End 10 Spacer 5 Washer 11 O ring 6 Nut 12 Pitch Change Link 28 16391 3 shown Figure 10 3 P N 28 16391 3 Pitch Change Link Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 346: ...UAL Rev 6 MM 10 14 2 Apr 7 15 Figure 10 4 Tail Rotor Pitch Change Link UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 357: ... SERIES MAINTENANCE MANUAL MM 10 25 Figure 10 11 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 358: ...d seal 4 2 Remove cotter pins 14 from retainer 13 3 Place pitch link retainer 13 in small arbor press and press dowel pin 12 through retainer and pitch control bearing 5 4 Rotate retainer and repeat on opposite pin 5 Gently press pitch control bearing 5 through pitch link retainer 13 wave spring washers 11 and bearing 9 CAUTION Use a press tool that exactly fits the bronze pitch control bearing or...

Page 359: ...ev 7 MM 10 27 Aug 22 16 Figure 10 12 Tail Rotor Slider Assembly Figure 10 13 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 360: ...lend smooth Brush on iridite finish 28 16394 Pitch Control Bearing Bronze O D Bore Keyway width Dowel pin holes Distortion of bore 1 3781 1 3777 dia 1 079 1 081 dia 1875 1895 2450 2480 None allowed Not repairable Not repairable Not repairable Not repairable Not repairable Replace bearing Replace bearing Replace bearing Replace bearing Replace bearing T 533 023 TS 023 Seal Visual for cuts or tears ...

Page 361: ... ECD016 11 Bearing Bearing O D Bore Axial movement of inner bearing to outer race Rotate to check bearing smoothness 2 6772 0000 0005 1 3780 0000 0005 002 No ratchety feeling Not repairable Not repairable Not repairable Not repairable Replace bearing Replace bearing Replace bearing Replace bearing N5002 268 PP Retaining Ring Check for flatness No distortion Not repairable Replace ring W1819 020 Wa...

Page 362: ...s cooled push the alignment pins into the inside of the bushing to remove NOTE If pin holes do not completely line up gently tap ear of pitch link retainer with plastic mallet until holes line up 6 Press dowel pin 11 into pitch link retainer 12 Rotate retainer and repeat NOTE Seat dowel pins to 0 01 inch below surface of pitch link retainer Pins must not extend through pitch control bearing 5 7 In...

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Page 373: ...ANCE MANUAL Rev 7 MM 10 41 Aug 22 16 Figure 10 21 Figure 10 22 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 374: ...driveshaft on tailcone 6 Secure driveshaft couplings to gearbox couplings using an aluminum block 235 inch thick between couplings See Figure 10 22 7 Mark location of forward coupling on driveshaft using a felt marker Mark location of pillow blocks on driveshaft 8 Remove driveshaft from tailcone 9 Remove forward coupling from driveshaft 10 Add 7 8 from mark on driveshaft and mark a new line for en...

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Page 377: ...lcone NOTE Stabilizer removal is not required on 280F models c Remove cotter pins from aft cable guide pulley d Remove pivot hardware from cable links at aft control brackets See item A of Figure 10 25 e Cut tail rotor cable aft of the turnbuckle in engine compartment f Attach a string to the forward end of the cable and pull the cable out through the aft end of tailcone NOTE String will follow ro...

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Page 380: ... inboard cable first CAUTION Turnbuckles may not have more than three threads showing at each end n Install safety clips to secure turnbuckles o Replace floor panels and seat deck in cabin p Check complete rigging of tail rotor See Section 10 1 Rigging Procedure q Cycle tail rotor pedals to check for binding UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructi...

Page 381: ...CE MANUAL Rev 7 MM 10 49 Aug 22 16 Figure 10 25 Tail Rotor Cables UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 382: ...NANCE MANUAL Rev 7 MM 10 50 Aug 22 16 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 403: ... sufficient depth to leave the cord exposed NOTE Do not reverse belt to perform this inspection Unnecessary damage may result 4 The belt should be replaced a Whenever it has been determined that cord failure exists b Whenever edge damage goes beyond the first V groove c When missing pieces of the V area become large enough to cause vibration in the drive system 5 Reference Photographs A B and C ar...

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Page 407: ... gearbox mount hardware 4 places Torque bolts NOTE Gearbox mount bolt torque is 240 in lbs 27 1 Nm Torque seal should be applied to the installed hardware for slippage indication NOTE NEW hardware must be used when re installing a main rotor gearbox as the self locking feature of the recommended nuts precludes re use 7 Install jackstrut and pulley assembly idler assembly and drive belt 8 Connect t...

Page 408: ...t when power is cut back Overrunning clutch lockup Replace clutch Erratic needle movement engine tach seems to climb Clutch slipping Internal clutch malfunction Replace clutch Worn pulley grooves Replace clutch Clutch end play exceeding 050 inch Internal wear of clutch Replace clutch Excessive noise on run down Internal wear Replace clutch Upper pulley TIR exceeding 009 inch Check while holding pu...

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Page 414: ...n 51 mm long and 1 1 4 in 32 mm wide d Wrap shim around key and with chamfered side of key down tap key and shim into pinion keyway e Using a razor knife trim shim stock along sides of key flush with pinion Key must be secure in pinion NOTE Do not allow grease to contaminate the races between the MRGB and the clutch and the clutch and upper jackstrut bearing 2 Apply AeroShell 22 compound to the bo...

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Page 428: ...16 Item 21 Rod End Axial play of swivel ball 007 clearance Not repairable Replace rod end 28 132009 11 Fig 11 16 Item 22 Spacer Bore 500 505 Width 090 None allowed 005 Not repairable Not repairable Replace spacer Replace spacer 28 132006 11 Fig 11 16 Item 23 Spacer Lgth 765 785 O D 4935 4965 None allowed 0003 Not repairable Not repairable Replace spacer Replace spacer UNCONTROLLED COPY WHEN DOWNLO...

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Page 434: ...pulley assembly on idler support shaft 3 Install idler support strap 8 between idler shaft and pylon Install mounting hardware at points 1 and 3 and partially tighten see Fig 11 8 4 Install spacer 22 in rod end 21 and place spacers 22 on each side of rod end 5 Insert rod end with spacers into over center bellcrank and install mount hardware partially tighten torque after belt tension is rigged 6 R...

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Page 447: ...pring 6 over shaft 7 and seat on retainer 7 Press bushing 15 into end cap 4 8 Install piston 3 through end cap and bushing 9 Turn piston onto shaft 7 and compress spring until unit will slide into housing 13 without bottoming against retainer 16 10 Apply grease to spring and to wall of housing 13 and insert spring assembly into housing assembly Use AeroShell 22 grease 11 Insert screws 12 through w...

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Page 533: ...ase to prevent oil leakage 6 Oil outlet CAUTION Do not overtorque fitting 140 160 in lb max 20 less if engine is hot Case may crack 7 Turbo mount hole must be threaded to receive mount bolt 8 Scavenge pump and piggy back fuel pump installation 9 Check engine sump for a machined flat and tapped hole to receive turbo mount Figure 13 1 Engine Accessory Section UNCONTROLLED COPY WHEN DOWNLOADED OR PRI...

Page 534: ...racks and holes d Inspect fire curtain for general condition Repair or replace as necessary see page MM 13 62 paragraph D e Inspect mounts for checks cracks deformity and age hardening Replace as required f Check electrical panel for security and condition of wiring and clean ground connections g Clean main fuel sump screen and replace filter as required h Check oil cooler for cracks damaged fins ...

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Page 536: ...ly machined section of the nut may not align in the correct position it will also need to be machined NOTE Items 1 3 5 6 and 7 must be accomplished prior to engine installation If not engine may have to be removed to perform h Remove fuel pump transfer scavenge pump and bolts and install fuel and scavenge pump i Check security of oil filter j Check condition and security of magneto Be sure fuel pr...

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Page 538: ...f engine 10 Install ignition wires to engine through baffling 11 Install static air manifolds on baffling and safety wire screws in pairs 12 Connect static air lines to nozzles 13 Install oil filler tube 14 Loosely install fan shroud and mount brackets 15 Replace fan shroud foam rubber air seal if required 16 Temporarily install fan to align shroud Use small wood wedges or similar shims around the...

Page 539: ...er between the shroud and the pylon to move the shroud If the shroud contacts the static line or the clamp that secures the line to the pylon the clamp on the pylon should be relocated so there is no interference 32 Connect fuel and air lines to injector 33 Install inlet adapter to injector and safety wire 34 Install turbocharger and connect induction tube oil lines and controls 35 Connect manifol...

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Page 541: ...stegate and or turbocharger depending on engine power requirements B Exhaust Manifold Removal See Figure 13 3 1 Disconnect exhaust gas temperature EGT probe 1 from exhaust manifold 2 Remove ducting from the heater muff 2 3 Loosen turbocharger exhaust inlet clamp 3 and slide it down on the exhaust tube 4 Remove exhaust inlet gasket 5 Disconnect linkage 4 at the wastegate 6 Remove clamp from turboch...

Page 542: ... muff sleeve on left half of manifold over right side manifold 4 Install left side manifold section to engine with new gaskets and hardware DO NOT TORQUE 5 Connect exhaust manifold to turbocharger inlet 3 a Install new gasket b Slide collar up and rotate for proper alignment c Install turbocharger inlet clamp 6 Install wastegate assembly 6 7 Install exhaust outlet shims and clamp 5 8 Check all att...

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Page 544: ... Rev 7 MM 13 22 Aug 22 16 Figure 13 3 Engine Exhaust System and Wastegate UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 545: ...the airflow forces to control fuel flow to the engine Fuel distribution to the individual cylinders is obtained by the use of a fuel flow divider and fuel injection nozzles It is suggested that all adjustments to the RSA 5 fuel injection system be performed with the use of the Operation and Service Manual Form 15 338C published by the Bendix Corporation Precision Airmotive B Fuel Injector System T...

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Page 555: ...MANUAL Rev 7 MM 13 33 Aug 22 16 Figure 13 5 Fuel Servo Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 560: ...MANUAL Rev 7 MM 13 38 Aug 22 16 Figure 13 6 Mixture Control Rigging UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 562: ...ure control incorporates a contoured needle that is moved in or out of an orifice by a bellows assembly The sealed bellows which reacts to changes in air density is filled with helium gas and a small quantity of inert oil to help damp vibration Under high density conditions the bellows is contracted and positions the needle in the orifice so that the effect of impact pressure on venturi throat pre...

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Page 570: ...13 9 1 Install a new gasket between the turbo inlet adapter and the turbocharger and secure adapter properly oriented to the turbocharger Torque the screws to 35 in lbs 4 0 Nm Safety wire screws NOTE Replace slotted head screws with cap screws P N NAS1352 3H8P 2 Install the lower outlet oil elbow and flexible outlet line to the turbocharger on the bench Torque and safety wire 3 Install inlet oil e...

Page 571: ...required torque and resafety the lower engine turbocharger mount bracket bolts 11 Torque injector outlet attaching bolts If required torque turbo center divider clamps and safety 12 Connect oil inlet and outlet lines NOTE Be sure that check valve located in the oil inlet line has arrow pointing toward turbocharger 13 Inspect all areas prior to closure of the engine compartment and flight check E T...

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Page 583: ...e belt and starter ring gear l Check shroud foam tape and replace if necessary m Install shim and fan assembly n Install drive pulley and jack strut o Install idler pulley assembly p Check engine oil level and replace oil removed with oil cooler q Run engine to check fan clearance and belt tracking 3 Foam Tape Installation a Remove all tape from the fan shroud and check fan blade to shroud clearan...

Page 584: ...ting hole b Drill 0 015 inch diameter hole in center of both patches c Coat one side of each patch with fire barrier sealant CP 25WB 3M or equivalent d Place one patch of each side of fabric hole with fire barrier sealant CP 25WB 3M or equivalent against the fabric e Fasten patches over the hole with 1 AN525 6R6 screw 1 AN960 6L washer and 1 AN364 632 nut 4 Areas of worn fabric around pylon tubes ...

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Page 593: ...ANUAL Rev 5 MM 13 71 Nov 5 13 Figure 13 16 Ignition Wire Installation UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 599: ...4 180 lbs or 30 gallons Full 240 lbs or 40 gallons NOTE Each tank contains one gallon of unusable fuel 4 Fuel Level Sending Unit a Sending Unit Removal See Fig 13 19 1 Remove three screws 2 attaching sending unit cover to top of right fuel tank 2 Remove cover 3 and spacers 4 3 Clean sealant from cover and its mounting location 4 Inspect the fuel transmitter for condition and corrosion Inspect the ...

Page 600: ...r equivalent around recess to act as a seal when cover is installed 8 Install cover 3 spacers 4 and screws 2 Secure screws 5 Fuel Tank Repairs a Drain fuel from tanks b Remove leaking tank s from aircraft c Repair seepage of fuel through fiberglass tank 1 Remove fuel level sending unit right tank and all fittings CAUTION Carefully remove fittings that are bonded in to prevent damage to scupper bag...

Page 601: ...ft d Repair leak s around tank cover seam 1 Drill out rivets in area of leak 2 Remove old fuel tank sealant from between tank and cover by scraping 3 Install a new coating of PR1440 B 2 fuel tank sealant 4 Drill out rivet holes and install next size larger diameter rivets 5 Allow PR1440 B 2 to cure tack free 6 Coat interior of tank in area of repair with slushing compound CAUTION Care must be take...

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Page 623: ...MANUAL Rev 5 MM 13 101 Nov 5 13 Figure 13 24 Aft Cable Attach Point UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 624: ...NCE MANUAL MM 13 102 Figure 13 25 Correlator Idle Stop Position UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 625: ...UAL Rev 5 MM 13 103 Nov 5 13 Figure 13 26 Fuel Servo Throttle Bellcrank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 626: ...ENANCE MANUAL MM 13 104 Figure 13 27 Override Stop Adjustment UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 627: ...v 5 MM 13 105 Nov 5 13 Figure 13 28 Fuel Servo with Tool No T 0113 Installed UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 628: ...MANUAL MM 13 106 Figure 13 29 Correlator Full Throttle Stop Position UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 629: ...L Rev 5 MM 13 107 Nov 5 13 Figure 13 30 Fuel Servo Full Throttle Position UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 630: ...NANCE MANUAL Rev 5 MM 13 108 Nov 5 13 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 635: ...nd 280F Series Maintenance Manual 15 1 INTRODUCTION This maintenance manual supplement sets forth the recommendations and procedures for maintaining and servicing the Model 280FX and 1986 F 28F helicopter manufactured by the Enstrom Helicopter Corporation This Supplement must be used in conjunction with the Model F 28F and 280F Series Maintenance Manual The procedures in this manual supersede any ...

Page 636: ... MANUAL SUPPLEMENT Rev 8 MM 15 2 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 637: ...CE MANUAL SUPPLEMENT Rev 8 MM 16 1 Sep 20 17 SECTION 16 RESERVED UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 638: ... MANUAL SUPPLEMENT Rev 8 MM 16 2 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 639: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 649: ...r supplies are located under the floor on either side of the cabin as shown in Figure 21 1 21 3 Annunciator Panel All of the warning and caution lights for 280FX helicopters are contained in an annunciator panel which is located at the top of the instrument panel On early production helicopters the warning lights include LOW ROTOR RPM CLUTCH ENGAGE and LOW FUEL PRESS the caution lights include OVE...

Page 650: ...ENT Rev 4 MM 21 2 Jun 21 12 Anti Collision and Navigation Light System Figure 21 1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 651: ...st be found and corrected before the aircraft is returned to service Press to test warning indicator on F 28F C Low Fuel Pressure Warning Circuit The low fuel pressure warning circuit comprises a pressure switch in the fuel line between the electric boost pump and the engine driven fuel pump which activates a red light in the annunciator panel If the pressure in this fuel line drops below 15 psi t...

Page 652: ... see Diagram 21 4 for RPM adjustment on low rotor indicator see Figure 21 2 Press to test warning indicator on F 28F E Hi Lo Rotor RPM Circuit F 28F S N 831 and subsequent and 280FX S N 2136 and subsequent are equipped with a Hi Lo Rotor RPM Circuit Refer to paragraph 21 7 for maintenance procedures F Overboost Circuit The overboost circuit consists of a pressure switch in the intake manifold whic...

Page 653: ... 21 12 Low Rotor RPM Indicator Adjustment F 28F S N 830 and prior 280FX S N 2136 and prior Figure 21 2 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 654: ... N 2148 and subsequent are equipped with LED position lights Lamp burned out Replace lamp or assembly as applicable Open circuit Check all connections and continuity of wiring harness Annunciator panel does not illuminate when press to test is pressed and panel light switch is off Master off Turn master on Circuit breaker tripped Reset Inst circuit breaker Open circuit Check wiring harness connect...

Page 655: ... connections and continuity of wiring harness ROTOR RPM light does not extinguish Open circuit Check connections and continuity of wiring between the signal conditioner and the magnetic sensor Magnetic sensor improperly positioned Remove the magnetic sensor inspection plug located on the front of the main rotor transmission Ensure the gap between the ring gear and the magnetic sensor is between 0 ...

Page 656: ...be LED Left and right position Complete assembly 1 Whelen N A 01 0790340 03 green 1 N A 01 0790340 04 red Tail navigation 2 Whelen 34 0412070 63 34 0428070 64 Annunciator Panel 12 G E 330 MS25237 330 327 MS25237 327 2 lamps per indicator 21 6 Ampere Load Conditions NOTE Table 21 1 and Table 21 2 provide the ampere load conditions for earlier F 28F and 280FX production and are not to be referenced ...

Page 657: ...1 0 1 0 1 0 1 0 1 0 Anticollision Lights 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 Navigation Lights 8 2 8 2 8 2 8 2 8 2 8 2 8 2 Panel Lights 2 0 2 0 2 0 2 0 2 0 2 0 2 0 Forward Landing Light5 20 8 20 8 Aft Landing Light5 3 14 3 14 TOTAL 15 44 27 44 21 44 25 64 37 64 31 64 61 58 49 53 NOTES 1 Flight condition A is normal day cruise 2 Flight condition B is normal night cruise 3 Device subject...

Page 658: ...3 0 3 0 3 0 3 0 3 0 3 0 3 0 3 0 3 0 3 Instrument Cluster 0 07 0 07 0 07 0 07 0 07 0 07 0 07 0 07 0 07 0 07 0 07 0 07 Master Relay 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 Anti Collision 3 5 3 5 3 5 3 5 3 5 3 5 3 5 3 5 3 5 3 5 3 5 3 5 Panel Lights 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Forward Landing Light 8 93 8 93 Aft Landing Light 8 93 8 93 Landing Light Relay 0 11 0 11 TOTAL 7 12 11 87 9 12 11 34 ...

Page 659: ...one when the collective controls are on the down stop The annunciator panel press to test switch S25 will illuminate the ROTOR RPM warning light for test purposes when the switch S25 is pressed A Signal Conditioning Unit The signal conditioning unit located behind the passenger s back cushion reads the signal from the magnetic pickup and activates the ROTOR RPM warning light and audio horn and ton...

Page 660: ...nal conditioning unit 3 Replace the seatback access panel and back cushions F Functional Test Hi Lo Rotor Rpm Warning System 1 Apply electrical power to the aircraft Check the CLUTCH ENGAGE light is illuminated and the ROTOR RPM light is not illuminated 2 Engage the belt clutch Check the ROTOR RPM light is illuminated and the CLUTCH ENGAGE light is not illuminated 3 Push the TEST button adjacent t...

Page 661: ...d allow the rotor RPM to build to the upper red line 385 RPM CAUTION Rotor RPM can build very quickly in autorotation Use care when approaching the upper red line NOTE The aircraft will have to be moderately heavy to achieve a high enough autorotation RPM An accelerated maneuver such as a turn or flare may also be required to increase the RPM 11 Check that the ROTOR RPM warning light illuminates a...

Page 662: ...S N 830 and prior and 280FX S N 2135 and prior Diagram 21 5 24 Volt Power Distribution F 28F S N 831 and subsequent and 280FX S N 2136 and subsequent Note Sheet 6 EDM 700 applicable to F 28F S N 831 and subsequent and 280FX S N 2140 and subsequent Note Sheet 7 LED Position Lights applicable to F 28F S N 833 and subsequent and 280FX S N 2148 and subsequent UNCONTROLLED COPY WHEN DOWNLOADED OR PRINT...

Page 663: ...NANCE MANUAL SUPPLEMENT Rev 4 MM 21 15 Jun 21 12 Diagram 21 1 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 664: ...NANCE MANUAL SUPPLEMENT Rev 4 MM 21 16 Jun 21 12 Diagram 21 2 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 665: ...ANUAL SUPPLEMENT Diagram 21 3 Rev 4 Jun 21 12 MM 21 17 MM 21 18 Blank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 666: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 667: ...21 19 Nov 5 13 Annunciator Panel Schematic F 28F S N 830 and prior 280FX S N 2135 Diagram 21 4 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 668: ...MANUAL SUPPLEMENT Rev 4 MM 21 20 Jun 21 12 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 669: ...tem Schematic F 28F S N 831 and subsequent 280FX S N 2136 and subsequent Sheet 1 Rev 8 Sep 20 17 MM 21 21 MM 21 22 Blank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 670: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 671: ...tem Schematic F 28F S N 831 and subsequent 280FX S N 2136 and subsequent Sheet 2 Rev 8 Sep 20 17 MM 21 23 MM 21 24 Blank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 672: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 673: ...tem Schematic F 28F S N 831 and subsequent 280FX S N 2136 and subsequent Sheet 3 Rev 8 Sep 20 17 MM 21 25 MM 21 26 Blank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 674: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 675: ...ystem Schematic Cyclic Grip F 28F S N 831 and subsequent 280FX S N 2136 and subsequent Sheet 4 Rev 8 MM 21 27 Sep 20 17 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 676: ... 24 Volt Electrical System Schematic Trim Switch Modules F 28F S N 831 and subsequent 280FX S N 2136 and subsequent Sheet 5 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 677: ...Schematic EDM 700 F 28F S N 831 and subsequent 280FX S N 2140 and subsequent Sheet 6 Rev 8 Sep 20 17 MM 21 29 MM 21 30 Blank UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 678: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 679: ...n Light Schematic F 28F S N 833 and subsequent 280FX S N 2148 and subsequent Sheet 7 Rev 8 MM 21 31 Sep 20 17 UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 680: ...MANUAL SUPPLEMENT Rev 8 MM 21 32 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 681: ...CE MANUAL SUPPLEMENT Rev 8 MM 22 1 Sep 20 17 SECTION 22 RESERVED UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 682: ... MANUAL SUPPLEMENT Rev 8 MM 22 2 Sep 20 17 INTENTIONALLY LEFT BLANK UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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Page 685: ...GT is synonymous with the term TIT if the aircraft is equipped with the analog indicator Later production F 28F S N 830 and prior and 280FX S N 2139 and prior are equipped with the Graphic Engine Monitor GEM Model 603 or Model 610 Current production F 28F S N 831 and subsequent and 280FX S N 2140 and subsequent are equipped with the Engine Data Management EDM Model EDM 700 The GEM and EDM models d...

Page 686: ...defined in Table 24 1 The operator may choose to reduce these to provide additional margins or increase engine life Lycoming and various industry groups have additional guidance NOTE Limits will reset to factory defaults when the display is switched between Fahrenheit and Celsius Table 24 1 EDM 700 Recommended Alarm Limit Values Parameter Description Recommended Limit CHT Cylinder head temperature...

Page 687: ...s required on indicated cylinder Rising EGT readings on all cylinders EDM 700 GEM 603 610 NOTE GEM 603 610 display will blink when this occurs WARNING This is a serious indication and can cause abrupt engine failure if proper steps are not taken Magneto out of time or faulty Perform a magneto check on the ground RPM drop on both magnetos should be excessive Check timing If correct overhaul or repl...

Page 688: ...reading in one cylinder continually EDM 700 GEM 603 610 Defective or blown exhaust gasket Cracked or loose exhaust system Inspect exhaust system and correct as required Intake valve not opening completely causing low compression Perform a compression check Plugged fuel nozzle Clean nozzle 1 2 3 4 T CHT 450 350 250 1 2 3 4 T CHT 450 350 250 EGT CHT o 5 o 4 o 3 1 2 3 4 EGT CHT o 5 o 4 o 3 1 2 3 4 UN...

Page 689: ...plug or ignition wire on each mag is defective the single mag check would indicate an equal rpm drop on each Such a double failure would go undetected The engine monitor will not only identify the problem but pinpoint the affected cylinder Mixture check The engine monitor displays a uniform EGT rise of all cylinders during mixture control check An abnormally large exhaust gas temperature different...

Page 690: ...h 8 Engine Oil Temperature Indicator 3 Manifold Fuel Pressure Indicator 9 Cylinder Head Temperature Indicator 4 Fuel Quantity Indicator 10 Inclinometer 5 Main Rotor Gearbox Temperature 11 Altimeter Indicator 12 Engine Monitor 13 Annunciator Panel Figure 24 1 Instrument Panel Layout UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original ma...

Page 691: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 692: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 693: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

Page 694: ...UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED Visit www enstromhelicopter com for instructions to order an original manual and to register for email notification of updates ...

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