Bell OH-58 C Technical Manual Download Page 85

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55
-1520

-22

-BD

Table

4-5.

Damage

Limits

Forward

Fuse

lage

—

Condition II (Cont )

DAMAGE LIMITS

LOCATION

CAP / FLANGE

SKIN / WEB

COMPONENT /
MEMBER

ELEMENT

CD’

CL’

WL’

NOTES /

CAUTIONS

(D’=N x CL)

(D’=N x WL)

Center Post

73.00-
87.85

24.48-

72.00

3.00L

3.00R

Side Webs and
Doublers

4.50

74.52-
81.30

54.50-
72.00

3.00L
3.00R

Front Web

2.50

80.00-
87.85

62.00-
72.00

3.00L-
3.00R

Splices

0.75

1.50

73.00-
87.85

20.00-
72.00

3.00L-
3.00R

Stiffeners

0.75

1.50

Passenger Seat

96.44-
114.57

29.92-
31.42

24.14L-
24.14R

Honeycomb Seat
Panel

10.00

No Damage

Within 3” of Gun

Mount (If Used)

96.44-
114.76

24.70-
29.92

23.08L&R Honeycomb Side

Panels

2.00

96.44

20.00-
29.92

23.08L-
23.08R

Honeycomb Front
Panel

4.5

96.44-
114.76

20.00-
29.92

23.08L-
23.08R

Angles, Side, Front,
Top, bottom

0.60

1.20

Gun Mounts

103.76

30.25

0.00 &
23.00L

Fittings and
Fasteners

No Damage Permitted (If Used)

Depression Stop
Attachment

104.55

30.25

5.85L

Honeycomb Panel

No Damage Permitted Within 1-1/2”

Radius of Attachments

Passenger Seat
Back Bulkhead

114.79-
122.20

31.42-
72.00

Flanges, Angles,
Caps, Splices, Clips

0.50

1.00

117.90-
122.20

48.25-
72.00

Web

1.40

115.10-
117.70

35.39-
49.98

17.80L-
17.80R

Honeycomb Door
Assembly

6.00

114.76-
117.70

31.42-
49.98

Honeycomb Panel
Assembly

2.00

-41

AIRFRAME

Summary of Contents for OH-58 C

Page 1: ...R PLANT CHAPTER 7 ROTORS CHAPTER 8 DRIVE TRAIN SYSTEM CHAPTER 9 HYDRAULIC SYSTEM CHAPTER 10 INSTRUMENT SYSTEMS CHAPTER 11 ELECTRICAL SYSTEM CHAPTER 12 FUEL SYSTEM CHAPTER 13 FLIGHT CONTROLS CHAPTER 14...

Page 2: ...ANDER AND SHALL BE REPAIRED BY STANDARD MAINTENANCE PROCEDURES AS SOON AS PRACTICABLE AFTER THE MISSION IS COMPLETED BDAR TECHNIQUES IN THIS MANUAL PERTAIN to the following helicopters OH 58A Helicopt...

Page 3: ...ed representative EXPLOSIVES Battle damaged areas should be inspected for unexploded ordnance before attempting repairs Disposal of unexploded ordnance should be accomplished by qualified personnel AR...

Page 4: ...equipment and who is competent in administering first aid When the technician is aided by operators he must warn them about dangerous areas Whenever the nature of the operation permits keep one hand...

Page 5: ...l i c o p t e r m u s t b e e l e c t r i c a l l y g r o u n d e d p r i o r t o d e f u e l i n g F u e l l i n e a n d t a n k r e p a i r s o f t e n i n v o l v e h a n d l i n g o f h i g h l y...

Page 6: ...as aviator helmet or ear plugs are required to be worn RADIOACTIVE MATERIALS Self luminous dials and ignition units may contain radioactive materials If such an instrument or unit is broken or becomes...

Page 7: ...sert pages as indicated below New or changed text material is indicated by a vertical bar in the margin An illustration change is indicated by a miniature pointing hand Remove Pages Insert Pages A B b...

Page 8: ......

Page 9: ...PAGES IN THIS PUBLICATION IS 762 CONSISTING OF THE FOLLOWING Page Change Page Change No No No No Cover 0 A through d 0 i 1 ii through ix 0 x blank 0 1 1 through 1 5 0 1 6 1 1 7 through 1 11 0 1 12 bla...

Page 10: ......

Page 11: ...s CHAPTER 2 ASSESSING BATTLEFIELD DAMAGE Section I Introduction Section II General Fault Assessment Table CHAPTER 3 GENERAL REPAIRS CHAPTER 4 AIRFRAME Section I Introduction Section II Expedient Struc...

Page 12: ...SYSTEM Section I Introduction Section II Electrical and Avionics Wiring Damage CHAPTER 12 FUEL SYSTEMS Section I Introduction Section II Lines and Hoses Section III Fuel Cell Damage CHAPTER 13 FLIGHT...

Page 13: ...S 1 INDEX 1 LIST OF ILLUSTRATIONS Title DA Form 2408 13 DA Form 2408 18 Damage Assessment Markings Sheet 1 of 3 Aircraft Sections DA Form 2404 Evaluating Damage to Angles Channels and Z Angles Damaged...

Page 14: ...late Installation Double Check Valve System Possible Alternatives Wood Plug Sealant for Small Holes Repair Using Screw Washer and Gasket Hose Assembly Sealant Nut and Bolt Sheet Metal with Sealant and...

Page 15: ...ield Terminator Repair Nickel Plated Shield Terminator Preparation Nickel Plated Shield Terminator Repair Terminal Lug Repair Self Clinching Cable Strap Self Clinching Cable Strap and Tool Tie Tape Re...

Page 16: ...ating System A C Heating and Ventilating System Bleed Air A Model Heating and Ventilating System Bleed Air C Model Combustion Heater Shroud Heater System Schematic Bleed Air Line Installation Bleed Li...

Page 17: ...em Assessment Procedures Flight Control System Assessment Procedures Nominal Tube Splice Sizes Bolt Drill Sizes for Control Tube Repairs Assessment Procedures Essential Spare Parts Spare and Repair Pa...

Page 18: ...r detailed repair procedures of the major functional groups The major functional groups correspond with the functional groups of the 23 series manuals that are employed in routine repairs to the helic...

Page 19: ...procedures so as not to further damage and or jeopardize either personnel or the equipment during or subsequent to the BDAR action Ensure all documentation is completed as directed in this manual and...

Page 20: ......

Page 21: ...ible types of combat damage and failure modes cannot be pre dicted nor are all effective field expedient repairs known This TM pro vides guidelines for assessing and repairing battlefield failures of...

Page 22: ...d equipment 3 Repair using parts that serve a noncritical function elsewhere on the same equipment for the purpose of restoring a critical function 4 Bypassing of noncritical com ponents in order to r...

Page 23: ...ity of a battle damaged helicopter to retrieve itself fly out from a battlefield environment It usually will involve flying with degraded flight status and with restrictions and limitations placed on...

Page 24: ...he minimum functional combat capability MFCC criteria for the OH 58 is as follows a Flight Capability for Mission Completion Helicopter s flight charac teristics degraded to a minimum of combat capabl...

Page 25: ...orm 2408 18 as per DA PAM 738 751 See Figures 1 1 1 2 b Recording of BDAR repairs and the use of status symbols as defined in DA PAM 738 751 will be completed as soon as practical to indicate any limi...

Page 26: ...include a statement that a temporary repair has been made 2 If the temporary repair limits the capability of the aircraft the following entry will be made on DA Form 2408 13 a Place a circled red X in...

Page 27: ...Quarts 13 14 15 SERVICED ANTl SERV 0XYGEN ICING TOTAL ADDED TOTAL GRADE ADDED ADDED TOTAL FLUID IN GRADE N0 1 IN TANKS N0 2 ENG APU TANKS ENG TANKS Gals BY STATION 1 2 3 4 5 6 7 TOTAL 16 STATUS 17 FA...

Page 28: ...OF PAGES 5 ITEM TO BE INSPECTED 6 REEFERENCE 7 FREQUENCY 8 NEXT DUE DA FORM 2404 18 1 JAN 64 EQUIPMENT INSPECTION LIST For use of this form see TM 38 750 the proponent agency is DCSLOG TM 55 1520 228...

Page 29: ...es or crosshatch between the two circular lines STRINGER REPAIR Place an X to the left and right of the circle FRAME REPAIR Place an X above and below the circle TO INDICATE DAMAGE TO SYSTEMS REQUIRIN...

Page 30: ...e conditions Continual assessment or reinspection is required after each sortie Instruction markings for system are in two parts 1 Repair instruction markings and meanings are shown on this sheet and...

Page 31: ...Electrical AV Avionics Flt Cont Flight Control Main Rotor Main Rotor Group Tail Rotor Tail Rotor Group Air Pneumatic Air Cond Air Conditioning BL Air Bleed Air System BLC Boundary Layer Control N2 Nit...

Page 32: ......

Page 33: ...icopter location can have a considerable effect on the assessment The following appraisal shall be accomplished 1 If possible and time permits inspect and check the helicopter using operator s check l...

Page 34: ...TM 55 1520 228 BD ASSESSING BATTLEFIELD DAMAGE Table 2 1 General Decision Logic SEE TM 55 1520 328 25 2 2...

Page 35: ...t The BDAR assessment procedure will refer you to a guide fix in this manual a stan dard TM 55 1520 228 23 repair if it is feasible or a higher AVIM level of repair if extent of damage time con strain...

Page 36: ...TM 55 1520 228 BD ASSESSING BATTLEFIELD DAMAGE Table 2 2 General Assessment Cont 2 4...

Page 37: ...TM 55 1520 228 BD ASSESSING BATTLEFIELD DAMAGE Table 2 2 General Assessment Cont 2 5...

Page 38: ...TM 55 1520 228 BD ASSESSING BATTLEFIELD DAMAGE Table 2 2 General Assessment Cont 2 6...

Page 39: ...Table 2 2 General Assessment Cont TM 55 1520 228 BD ASSESSING BATTLEFIELD DAMAGE 2 7...

Page 40: ...I 2 8 TM 55 1520 228 BD ASSESSING BATTLEFIED DAMAGE Table 2 2 General Assessment Cont...

Page 41: ...TM 55 1520 228 BD ASSESSING BATTLEFIELD DAMAGE Table 2 2 General Assessment Cont I 2 9 2 10 Blank...

Page 42: ......

Page 43: ...OF THE COMMANDER AUTHORIZED TRAINING FIXES ARE LISTED IN APPENDIX E IN EITHER CASE DANAGES SHALL BE REPAIRED BY STANDARD PROCEDURES AS SOON AS PRACTICABLE No general repairs have been identified Chapt...

Page 44: ......

Page 45: ...ture No amount of structural damage to secondary struc tures will restrict combat capability from a structural point of view however secondary structure may be required for aerodynamic reasons or to a...

Page 46: ...TM 55 1520 228 BD AIRFRAME 4 2 Table 4 1 Aircraft Structure Damage Assessment Prodecures...

Page 47: ...TM 55 1520 228 BD AIRFRAME Figure 4 1 Aircraft Sections 4 3...

Page 48: ...y impact or penetration in regions away from the site of primary damage 2 Inspect for small and large cracks caused by projectile damage Small cracks will enlarge under con tinued loading particularly...

Page 49: ...pecting for broken and missing fasteners Inspect fasteners for security shear pull through tear out and elongated fastener holes Where possible inspect fasteners from both sides h Inspecting for Delam...

Page 50: ...TM 55 1520 228 BD AIRFRAME Figure 4 2 DA Form 2404 4 6...

Page 51: ...damages In Figure 4 4 the length of the flat tened cross section of the angle is a b CD is the depth of the damage into the flattened cross section The length of the remaining effective cross section...

Page 52: ...TM 55 1520 228 BD AIRFRAME Figure 4 3 Evaluating Damage to Angles Channels and Z Angles 4 8...

Page 53: ...TM 55 1520 228 BD AIRFRAME Figure 4 4 Damaged Cross Section 4 9...

Page 54: ...TM 55 1520 228 BD AIRFRAME Figure 4 5 Measuring Skin Panel Damage 4 10 IMPORTANT MEASURED LATERAL DAMAGE MUST INCLUDE ALL RADIATED CRACKS...

Page 55: ...TM 55 1520 228 BD AIRFRAME Figure 4 6 Measuring Damage in Webs and Panels 4 11...

Page 56: ...4 7 are designated for a given condition as follows CD Allowable depth of damage CL Allowable length width of damage A Allowable area of damage D Minimum allowable distance between damages WL Allowabl...

Page 57: ...TM 55 1520 228 BD AIRFRAME Figure 4 7 Measuring Damage in Honeycomb Sandwich Panels 4 13...

Page 58: ...sible Self recovery is preferable to disassembly and boxing an aircraft for transportation As time permits proceed as follows 1 Mark all visible cracks and the extent of other structural damage with c...

Page 59: ...ircraft to condition 1 a determine the required repairs for all damaged structural elements that are below condition 1 b Repairs on damaged struc tural elements that are better than condition 1 may be...

Page 60: ...is a full mono coque structure utilizing a tapered cir cular section of aluminum alloy skin Redistribution in the forward end which is required to transfer loads from the monocoque structure to the f...

Page 61: ...TM 55 1520 228 BD AIRFRAME Figure 4 8 OH 58 Helicopter 4 17...

Page 62: ...ED CENTER TAILROTOR BEARING HANGER TANGENCY POINT CONTOURS IN BOOM STATIONS ARE CIRCLES RADIUS AT 31 87 IS 7 3555 RADIUS AT 182 405 IS 3 286 TAPER OF BOOM IS 0 02703 PER INCH BOOM STATION IS 90 TO HOR...

Page 63: ...TM 55 1520 228 BD AIRFRAME Figure 4 10 Cockpit 4 19...

Page 64: ...TM 55 1520 228 BD AIRFRAME Figure 4 11 Fuselage Pylon Support Structure Sheet 1 of 5 4 20...

Page 65: ...TM 55 1520 228 BD AIRFRAME Figure 4 11 Fuselage Pylon Support Structure Sheet 2 of 5 4 21...

Page 66: ...TM 55 1520 228 BD AIRFRAME Figure 4 11 Fuselage Pylon Support Structure Sheet 3 of 5 4 22...

Page 67: ...TM 55 1520 228 BD AIRFRAME FS130 FUSELAGE STA 130 BULKHEAD FS117 71 WL 21 00 Figure 4 11 Fuselage Pylon Support Structure Sheet 4 of 5 4 23...

Page 68: ...TM 55 1520 228 BD AIRFRAME Figure 4 11 Fuselage Pylon Support Structure Sheet 5 of 5 4 24...

Page 69: ...TM 55 1520 228 BD AIRFRAME Figure 4 12 Upper and Lower Shell Structure 4 25...

Page 70: ...TM 55 1520 228 BD AIRFRAME Figure 4 13 Aft Fuselage Structure 4 26...

Page 71: ...TM 55 1520 228 BD AIRFRAME Figure 4 14 Tail Boom 4 27...

Page 72: ...TM 55 1520 228 BD AIRFRAME Figure 4 15 Cowling and Firewalls 4 28...

Page 73: ...onent to other major components are sheared pulled through or missing at one or more locations 4 Three or more fasteners next to each other which join a cap longeron and stringer to the web are sheare...

Page 74: ...personnel cargo or equipment for which it was designed 3 The panel is on the outside of the aircraft where it is exposed to aerodynamic forces and the damage is 4 30 oriented so as to produce peeling...

Page 75: ...10 65 Section 73 04 30 29 17 31L R Pilot s Copilot s 73 04 30 29 Collective 21 00 Jackshaft 73 04 30 29 Pedestal 55 14 20 00 5 06R Structure 73 04 30 17 3 06L age Limits Forward Fuselage Condition I D...

Page 76: ...0 25 0 50 10 73 00 87 85 27 48 72 00 3 00L 3 00R Side Webs and Doublers 2 25 5 74 52 81 30 54 50 72 00 3 00L 3 00R Web Front 0 80 00 87 85 62 00 72 00 3 00L 3 00R Splices 0 73 00 87 85 20 00 72 00 3...

Page 77: ...1 50 1 50 5 5 Bulkhead FS130 Upper 130 51 72 72 00 Inboard Outboard Frame Caps 0 30 0 60 10 130 51 72 72 00 Frame Webs 2 40 5 130 51 72 72 00 Clips Splices Supports Flanges 0 30 0 60 10 Bulkhead FS13...

Page 78: ...s No Damage Allowed 120 90 67 92 71 96 3 00L 3 00R Bulkhead Skin and Doubler 2 00 5 80 46 130 00 67 92 3 00L 3 00R Bottom Skin and Access Cover 0 75 5 Lower Cabin Shell 73 18 113 00 20 00 25 25 18 40L...

Page 79: ...L R Cross Tube Aft Strap 0 31 0 62 73 00 18 30 13 30L R Cross Tube Forward Strap 0 10 0 20 73 00 130 00 18 30 20 75 13 30L R 10 25L R Back Up Supports No Damage Allowed 73 00 130 00 18 30 20 75 13 30L...

Page 80: ...5 61 76 Tail Boom Attach Fittings No Damage Allowed Lower Longeron 130 00 192 84 29 40 44 50 22 50 1 10L R Angle No Damage Allowed 130 00 29 40 Splice No Damage Allowed Aft Fuselage 130 00 206 35 Lowe...

Page 81: ...130 00 167 00 71 74 14 12L 14 12R Doublers Splices Vertical Stiffeners 0 75 1 50 10 Canted Web 130 00 192 84 51 67 59 98 25 00L R 7 00L R Stiffeners 1 15 2 30 10 130 00 192 84 51 67 59 98 15 00L R 7 0...

Page 82: ...L R Fitting No Damage Allowed 4 38 Table 4 4 Damage Limits Tail Boom and Landing Gear Condition I DAMAGE LIMITS LOCATION CAP FLANGE SKIN WEB COMPONENT MEMBER BS WL BL ELEMENT CD CL N WL N NOTES CAUTIO...

Page 83: ...MEMBER FS WL BL ELEMENT CD CL N WL N NOTES CAUTIONS D N x CL D N x WL Fin Fin to Antenna Attaching Flanges 1 20 2 40 10 Fin to Boom Inserts No Damage Within 3 of Inserts Tail Skid Tube Fitting No Dam...

Page 84: ...ter Bulkhead Section 73 04 30 29 54 89 Web 12 00 5 73 04 21 00 30 29 10 64 17 31L R Vertical Stiffeners 2 20 4 40 Pilot s Copilot s Seat 73 04 30 29 Aft Attachment Angle 0 70 1 40 5 Collective Jacksha...

Page 85: ...No Damage Within 3 of Gun Mount If Used 96 44 114 76 24 70 29 92 23 08L R Honeycomb Side Panels 2 00 5 96 44 20 00 29 92 23 08L 23 08R Honeycomb Front Panel 4 5 5 96 44 114 76 20 00 29 92 23 08L 23 0...

Page 86: ...0 00 50 04 69 00 20 55L R Inner Skin and Doublers 5 30 5 117 71 130 00 50 04 67 20 25 25L Outer Skin 7 50 5 117 71 130 00 50 04 67 20 25 25R Outer Skin and Door Panel 7 50 5 117 71 130 00 50 00 72 00...

Page 87: ...00 130 00 20 00 54 65 Honeycomb Panel 10 00 5 No Damage Within 3 Radius of Inserts 96 44 20 00 Splice 1 50 3 00 5 36 00 130 00 20 00 54 65 Frames Angles Stiffeners 0 75 1 50 5 Upper Cabin Roof Shell 5...

Page 88: ...50L Fitting No Damage Allowed Anti Torque Support Fittings 78 95 23 83 3 06L Fitting No Damage Allowed 4 44 Table 4 6 Damage Limits Aft Fuselage Condition II DAMAGE LIMITS LOCATION CAP FLANGE SKIN WE...

Page 89: ...2 205 76 72 00 8 33L 8 33R Skin 3 75 5 Oil Cooler 167 00 179 92 72 00 10 18L 10 18R Honeycomb Support Panel 3 00 5 No Damage Within 2 of Inserts 171 50 72 00 0 Pan Drain No Damage Allowed Anti Torque...

Page 90: ...34 46 Inserts Damage Limited to Two Inserts to Each Group of Four 130 00 167 00 29 47 34 46 Honeycomb 15 0 5 No Damage Within 2 of Effective Inserts Bulkheads 142 154 167 179 192 Frame Section 1 10 2...

Page 91: ...182 40 31 87 42 59 79 82 98 29 116 84 150 22 Bulkheads 1 00 2 00 5 174 10 182 40 Bulkheads 1 05 2 10 5 174 10 182 40 Fin Supports 0 50 1 00 5 174 10 182 40 Gearbox Mounting Plate No Damage Allowed 17...

Page 92: ...verstress such as buckling and misalignment 2 Fasteners securing the fire wall to the upper deck structure are sheared stripped pulled through or missing at three or more adjoining loca tions 3 Twenty...

Page 93: ...ained damage in multiple locations It is essential that damage to an individual structural item not be considered by itself Suit able repair will often depend on the condition of the adjacent structur...

Page 94: ...4 50 Table 4 8 Metal Substitution Chart TM 55 1520 228 BD AIRFRAME...

Page 95: ...ctural stiffness should be sufficient to assure loads are properly distributed and to avoid serious vibrations Use shims to avoid joggles Avoid hand formed and fitted parts Where a stringer stiffener...

Page 96: ...TM 55 1520 228 BD AIRFRAME Figure 4 16 Typical Former Repair Sheet 1 of 2 4 52...

Page 97: ...TM 55 1520 228 BD AIRFRAME Figure 4 16 Typical Former Repair Sheet 2 of 2 4 53...

Page 98: ...nger to match existing holes Attempt to interpitch new fasteners within the existing rivet pattern if the area is inaccessible for back drilling 5 Rivet the substitute stiffener stringer in place Figu...

Page 99: ...its and will require repair A patch plate can often be used to repair the damage LIMITATIONS None Condition 1 Inspect after every flight for damage growth PERSONNEL TIME REQUIRED 2 Soldiers 2 Hours MA...

Page 100: ...TM 55 1520 228 BD AIRFRAME Figure 4 19 Typical Patch Plate Repair 4 56...

Page 101: ...be at least that of the damaged cap or longeron Refer to Table 4 8 for substitute materials to use on repair if a longeron or cap section is not available Skin Patch Blind Rivets item 41 Appx C PROCE...

Page 102: ...TM 55 1520 228 BD AIRFRAME Figure 4 20 Expedient Cap Longeron Repair 4 58...

Page 103: ...ortion of damaged stringers The strap should be long enough to overlap both ends of the damaged bulkhead or frame flange by six rivets on each end In the areas where the repair strap will overlap on t...

Page 104: ...TM 55 1520 228 BD AIRFRAME Figure 4 21 Repair of Damaged Bulkhead Flange 4 60...

Page 105: ...TM 55 1520 228 BD AIRFRAME Figure 4 22 Typical Combination Repair Sheet 1 of 2 4 61...

Page 106: ...TM 55 1520 228 BD AIRFRAME Figure 4 22 Typical Combination Repair Sheet 2 of 2 4 62...

Page 107: ...Remove ragged edges Figure 4 23 2 Apply tape over repair to keep out moisture 3 Record BDAR action taken When mission is complete as soon as practical repair the equipment system using standard mainte...

Page 108: ...d Honeycomb Core Panel 2 8 Inch Damage One Skin and Core MAKE PATCH FROM 2024 T3 OR 7075 T6 ALCLAD ALUMINUM 1 8 CHERRY RIVET 2 DIA EDGE DISTANCE 4 DIA RIVET SPACING THRU ONE SKIN ONLY PATCH REPAIR PAT...

Page 109: ...ins and Core LIMITATIONS None PERSONNEL TIME REQUIRED 1 Soldier 2 Hours MATERIALS TOOLS REQUIRED 2 Patch Plates Cherry Rivets PROCEDURAL STEPS 1 Remove damaged skin and core Figure 4 28 Clean top and...

Page 110: ...TM 55 1520 228 BD AIRFRAME Figure 4 26 Damage Repair Accessible One Side Only Figure 4 27 Patch Plates One Side Accessible Repair 4 66...

Page 111: ...TM 55 1520 228 BD AIRFRAME Figure 4 28 Damage Over Repair of Honeycomb Core Panel 8 Inches Both Skins and Core 4 67...

Page 112: ...to 3 4 inch spacing 3 8 inch edge distance along both sides of any crack and along the sides of the hole 3 Lace safety wire with needle nose pliers through holes and across cracks and over hole formin...

Page 113: ...TM 55 1520 228 BD AIRFRAME Figure 4 29 Fracture Lacing With Safety Wire 4 69...

Page 114: ...contour of tail boom The patch must extend a minimum of 3 inches forward and aft and 1 inch above and below the damaged area Figure 4 30 3 Sand surfaces lightly to remove all surface finish Clean are...

Page 115: ...PROCEDURE INDEX PARA Hard Landings Sudden Stops 5 6 Skid Damage 5 7 Section II SKID TUBE 5 5 GENERAL INFORMATION a In battle conditions part of the skid tube may sustain various amounts of damage whi...

Page 116: ...TM 55 1520 228 BD ALIGHTING GEAR Figure 5 1 Landing Gear and Support Installation Figure 5 2 Skid Tube Damage Zones 5 2...

Page 117: ...TM 55 1520 228 BD ALIGHTING GEAR Table 5 1 Assessment Procedure Logic 5 3...

Page 118: ...ected This will most likely go beyond scope of BDAR Section III SKID DAMAGE 5 7 SKID DAMAGE GENERAL INFORMATION Landing skids may be damaged by wear or enemy fire If time is available repair can be pe...

Page 119: ...TM 55 1520 228 BD ALIGHTING GEAR Figure 5 3 Skid Repair Figure 5 4 Clamp Repair 5 5...

Page 120: ...TM 55 1520 228 BD ALIGHTING GEAR Figure 5 5 Fabricated Clamp 5 6...

Page 121: ...alve Inoperative 6 5 Double Check Valve Inoperative 6 6 Oil Tank Punctured 6 7 Oil Lines Rigid Type Repair 9 7 Fuel Oil Pneumatic Line Repair Section II COMPONENT EXPEDIENT FIXES This section has vari...

Page 122: ...TM 55 1520 228 BD POWER PLANT Figure 6 1 T63 Series Engine 6 2...

Page 123: ...POWER PLANT Table 6 1 Engine BDAR Assessment Logic 6 3...

Page 124: ...wly b Monitor TOT and N1 gauges for possible stall readings NOTE Stall usually occurs between 65 percent and 75 percent N1 c If stall is present TOT will rise rapidly and N1 RPMs will fluctuate betwee...

Page 125: ...the pilot must be made aware that if any component of the system is removed or bypassed any input will result in erratic engine response At all times the integrity of all fuel control lines must be m...

Page 126: ...RIALS TOOLS REQUIRED Flex Line Tubing ID 0 25 in Length 12 in rein No 4 Fittings 1 Refer to Figure 6 3 b to establish bypass configuration 2 Disconnect clamp from flexible hose and extend flexible hos...

Page 127: ...TM 55 1520 228 BD POWER PLANT Figure 6 3 Double Check Valve System Possible Alternatives 6 7...

Page 128: ...ean area around crack with solvent to remove the oil 2 Seal crack with tape 3 Replenish oil supply 4 Record BDAR action taken When mission is complete as soon as practical repair the equipment system...

Page 129: ...hole 2 Pierce a small hole in the center of the gasket material 3 Using the sheet metal screw and washer screw the gasket material through the pierced hole and through the small hole on the oil tank...

Page 130: ...se assembly about half way through hole Tighten nut on bolt expand hose to seal hole If necessary remove oil tank plate to allow a wrench or pliers inside of oil tank to hold nut while turning bolt 4...

Page 131: ...item 20 Appx C PROCEDURAL STEPS 2 If sealant is to be used clean area around hole with solvent so sealant will stick 3 Put sealant or gasket material over hole Put sheet metal plate over hole and sec...

Page 132: ...TM 55 1520 228 BD POWER PLANT I Figure 6 8 Sheet Metal Plate with Sealant and or Cherry Rivets 6 12...

Page 133: ...rotor is driven by the tail rotor gearbox and provides for directional control See Figures 7 1 and 7 2 for system configuration Assessment proce dures are found in Table 7 1 Section II REPAIRS 7 5 GEN...

Page 134: ...Latch 2 Lever 11 Blade Assy 3 Idler Link 12 Retaining Bolt 4 Swashplate Assy 13 Grip 5 Link 14 Mast Nut 6 Collective Lever 15 Hub Assy Oil Lubricated shown 7 Inner Ring 16 Pitch Horn 8 Outer Ring 17...

Page 135: ...1 Hub 2 Pitch Horn 3 Blade 4 Tail Rotor Gearbox TM 55 1520 228 BD ROTORS Figure 7 2 Tail Rotor System 7 3...

Page 136: ...TM 55 1520 228 BD ROTORS Table 7 1 Assessment Procedures 7 4...

Page 137: ...TM 55 1520 228 BD ROTORS Figure 7 3 Rotor Blades Damage Sensitive Areas 7 5...

Page 138: ...r Inspection of repaired area after each flight would be required PERSONNEL TIME REQUIRED 2 Soldiers 1 Hour MATERIALS TOOLS REQUIRED Army Green Tape Maximum Width Available 3 Inches Minimum or Alumini...

Page 139: ...TM 55 1520 228 BD ROTORS Figure 7 4 Rotor Blade Repair Application of Tape 7 7...

Page 140: ...When entire blade and over the repaired area mission is complete as soon as practical repair the equipment system 9 Wrap exact number of tape wraps on using standard maintenance procedures opposite s...

Page 141: ...mitter Leak 8 7 Low Pressure Sensing Switch 8 8 Oil Hoses and Lines Leaks or Restrictions 8 9 Transmission Bullet Damage 8 10 Tail Rotor Gearbox Bullet Damage 8 11 Section 11 REPAIR 8 5 SENSITIVITY OF...

Page 142: ...ler Driveshaft 14 Coupling Main Driveshaft Oil Cooling Blower and 15 Splined Adapter Shaft Assy 16 Oil Filter Assy Aft Short Tail Rotor Driveshaft 17 Tail Rotor Driveshaft Long Tail Rotor Driveshaft S...

Page 143: ...TM 55 1520 228 BD DRIVE TRAIN SYSTEM 8 3 Figure 8 1 Drive Train System Sheet 2 of 4...

Page 144: ...TM 55 1520 228 BD DRIVE TRAIN SYSTEM Figure 8 1 Drive Train System Sheet 3 of 4 8 4...

Page 145: ...TM 55 1520 228 BD DRIVE TRAIN SYSTEM Figure 8 1 Drive Train System Sheet 4 of 4 8 5...

Page 146: ...TM 55 1520 228 BD DRIVE TRAIN SYSTEM Table 8 1 Drive Train System BDAR Assessment Procedures 8 6...

Page 147: ...ot in a bend portion of duct routing a repair can be applied as shown at either repair B C or D If area to be repaired is in a bend portion of duct routing a repair can be applied as shown at either r...

Page 148: ...Assy Transfer Tube 11 Filter Bypass Valve Nozzle Jet 12 Oil Temperature Switch Pressure Regulating Valve 13 Oil Pump Hoses and Lines 14 Chip Detector Oil Pressure Transmitter 15 Chip Detector P l u g...

Page 149: ...TM 55 1520 228 BD DRIVE TRAIN SYSTEM Figure 8 3 Flex Duct Repair Sheet 1 of 2 8 9...

Page 150: ...TM 55 1520 228 BD DRIVE TRAIN SYSTEM Figure 8 3 Flex Duct Repair Sheet 2 of 2 8 10...

Page 151: ...Record BDAR action taken When mission is complete as soon as practical repair the equipment system using standard maintenance procedures 8 9 OIL HOSES AND LINES LEAK OR RESTRICTION CRIMP GENERAL INFOR...

Page 152: ...am bind or lose lubricant repair may be deferred LIMITATIONS Small oil loss can be tolerated If aircraft is run for an extended period of time with little or no oil gearbox will jam PERSONNEL TIME REQ...

Page 153: ...tallation They may be routed along any convenient path as long as they do not interfere with personnel or with operating equipment Long lines and hoses should be clamped to hard sup ports at convenien...

Page 154: ...ve 9 Hydraulic Pump 10 Case Drain Hose 11 Solenoid Valve 12 Hose Return 13 Hose Return 14 15 16 17 18 19 20 21 22 23 24 25 Hose Pressure Hose Pressure Hose Pressure Hose Return pressure Switch Relief...

Page 155: ...0 4 Quick Disconnects 11 5 Pump 12 6 Check Valve 13 7 Filter Filter Bypass Valve Relief Valve Solenoid Valve Pressure Switch Servo Actuator Cyclic Servo Actuator Collective TM 55 1520 228 BD HYDRAULIC...

Page 156: ...TM 55 1520 228 BD HYDRAULIC Table 9 1 Assessment Logic Figure 9 3 Two Part Fitting 9 4...

Page 157: ...TM 55 1520 228 BD HYDRAULIC Figure 9 4 Four Part Fitting Figure 9 5 Using Tube Cutter 9 5...

Page 158: ...INFORMATION Aluminum tubing is subject to damage by projectiles and fragments Replacement with original replacement parts is desirable but not essential In BDAR tubing and hose AN and MS fittings and...

Page 159: ...TM 55 1520 228 BD HYDRAULIC SECTION A A Figure 9 6 Properly Burred Tubing Figure 9 7 Damaged Tube Section 9 7...

Page 160: ...TM 55 1520 228 BD HYDRAULIC Figure 9 8 Splice Repair Assembly Figure 9 9 Repair Fitting and Tube Installation 9 8...

Page 161: ...on the OH 58 are braided wire covered rubber hose Repair of damage or wear to the wire braids is deferrable for one more flight provided the rubber inner hose is not leaking under pressure Inspect aft...

Page 162: ...TM 55 1520 228 BD HYDRAULIC Figure 9 10 Damaged Tube Section Complex Bends Figure 9 11 Splice Adapter Assembly Installation 9 10...

Page 163: ...re braid cover and the inner rubber hose Force onto hose until the edge of the sleeve is even with the end of the rubber hose 5 Reem inside end of Teflon hose with a square tool or a wooden plug so th...

Page 164: ...TM 55 1520 228 BD Figure 9 12 Installation of Socket and Sleeve Figure 9 13 Assembly of MS Fitting 9 12...

Page 165: ...dent primarily on the resilience of the o rings When moving parts are involved minor seepage may be normal and acceptable A moist surface found on moving parts of a hydraulic unit piston shaft is an i...

Page 166: ...ough B87 are equivalent to MS28775 426 through 460 AN6227B88 is equivalent to MS28775 425 AN6230 B1 through B25 are equivalent to MS28775 223 through 247 9 10 HYDRAULIC FLUID SUBSTITUTIONS a If the or...

Page 167: ...ILE MIL H 5606 2 3 MIL P 551O N507 9 BUNA N 65 F to 180 F 90 MIL H 83282 NAS1593 MIL R 25897 Fluoro 1 High temperature NAS1595 CL 1 77 545 Elastomer 20 F to 400 F 70 fluid resistant NAS1594 MIL R 2589...

Page 168: ...2 N103 7 BUNA N 65 F to 225 F 70 pneumatic service Mineral oil hydraulic fluids alkalies gasolines NITRILE diesel oils 2 3 SB715BE1 E3 F1 N109 7 BUNA N 30 F to 250 F 70 pneumatics AN1239XX Petroleum b...

Page 169: ...pneu NITRILE matics High extru 2 3 SB915B E1 E3 N183 9 BUNA N 30 F to 250 F 90 sion resistance Mineral oil NITRILE hydraulic fluids 2 3 SB915B E1 E3 N552 9 BUNA N 30 F to 250 F 90 pneumatics Air gase...

Page 170: ......

Page 171: ...COMBAT OR FOR TRAINING AT THE DISCRETION OF THE COMMANDER AUTHORIZED TRAINING FIXES ARE LISTED IN APPENDIX E IN EITHER CASE DAMAGES SHALL BE REPAIRED BY STANDARD PROCEDURES AS SOON AS PRACTICABLE The...

Page 172: ......

Page 173: ...the major components cable routes and wiring terminations for the more complex avionics systems b Circuit Function The unit number and circuit designation letter INTRODUCTION It is used to distinguis...

Page 174: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Table 11 1 Electrical and Avionics Assessment Logic Figure 11 1 Circuit Identification 11 2...

Page 175: ...RUMENT Tailpipe temperature Fuel flow Fuel quantity Fuel capacity Oil temperature Oil pressure Manifold pressure Fuel pressure Engine oil quantity Tachometer Warning F FLIGHT INSTRUMENT Bank and turn...

Page 176: ...SSIGNED O In order to avoid confusion with the numeral zero the letter O shall not be used for circuit or cable identi fication P DC POWER Q FUEL AND OIL Fuel valves Fuel booster pump motor Moisture c...

Page 177: ...devices U MISCELLANEOUS ELECTRONIC Electronic wiring for which no R S or T designation has been assigned by the procuring activity shall have the circuit function letter U assigned Examples of wiring...

Page 178: ...1 18 Component Bridging 11 19 Connector Repair 11 20 Circuit Protection Device Repair 11 21 Bus Bars 11 22 Battery Repair BB 476 A 11 23 Damaged or Defective Power Relays 11 24 Substitute Emergency An...

Page 179: ...use of wiring repair tools and materials 11 5 SPLICING UNSHIELDED WIRES GENERAL INFORMATION This procedure provides for repairing damaged unshielded wires WARNING Do not be misled by the term low vol...

Page 180: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 2 Crimp Splice 11 8...

Page 181: ...DAR action taken When mission is complete as soon as practical repair the equipment system using standard maintenance procedures OPTION 3 Split Bolt Splice Connectors LIMITATIONS Only to be used on wi...

Page 182: ...equipment system using standard maintenance procedures OPTION 4 Twist Wire LIMITATIONS This is a temporary type repair PERSONNEL TIME 1 Soldier 10 Minutes MATERIALS TOOLS REQUIRED Tape Electrical ite...

Page 183: ...flight only PERSONNEL TIME REQUIRED 1 Soldier 10 Minutes MATERIALS TOOLS REQUIRED Cylindrical metal casing such as ball point pen refills expended cartridges etc Insulation Sleeve or Tape item 10 Appx...

Page 184: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 5 Replacement Section Twist Wire Repair Figure 11 6 Metal Casing Splice Repair 11 12...

Page 185: ...erminal lugs together as shown in Figure 11 7 7 Slide the insulating sleeve over the splice so that the ends of the insu lating sleeve extend at least 3 4 of an inch beyond the ends of each terminal l...

Page 186: ...e two wire ends together so that the strands interlink 7 Secure with screw clamp control cable clamp safety wire or other suitable means Figure 11 9 8 Insulate with tape or insulation sleeve 9 Record...

Page 187: ...with nylon braid or some other means CAUTION Make sure aircraft power is off Disconnect battery before touching wires OPTION 1 Heat Shrinkable Repair Tape LIMITATIONS This is a temporary repair PERSON...

Page 188: ...move damaged insulation and examine to insure center conductor is not damaged 2 Prepare a transparent sleeve of flexible tubing 1 1 2 times the outside diameter of the wire and 2 inches longer than th...

Page 189: ...m pound over the exposed center conductor 3 Allow time to dry If compound coating does not seem to be sufficient apply additional layers as needed 4 Record BDAR action taken When mission is complete a...

Page 190: ...et at 900 F Keep hot air away from shield sleeve 5 Center and shrink the shield over the splice area so that the solder melts and flows Shield sleeve braid must overlap cable braid at both ends Refer...

Page 191: ...nt splice or by using one of the splicing procedures in paragraph 11 9 6 Push the free end of the grounding wire into the uncrimped grounding sheath connector Crimp securely Figure 11 15 7 If an insul...

Page 192: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 15 Shielded Cable Repair 11 20...

Page 193: ...cable TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Shielding must be long enough to overlap the shielding on both sides of the cable being repaired after the center conduc tor is repaired Shieldi...

Page 194: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM PIGTAILS STEP A STEP B Figure 11 16 Pigtail Method Repair 11 22...

Page 195: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 17 Substitute Shielded Braid Repair 11 23...

Page 196: ...TIONS This is a temporary repair PERSONNEL TIME REQUIRED 1 Soldier 15 Minutes MATERIALS TOOLS REQUIRED Shield Terminator item 10 Appx B Reflector Heat Gun Heat Source Stripper or Knife Insulating Slee...

Page 197: ...fe Insulating Sleeve item 10 Appx B PROCEDURAL STEPS 1 Prepare cable Figure 11 20 for repair Refer to 2 Position ground lead and shield ter minator as shown in Figure 11 21 3 Heat shield terminator un...

Page 198: ...Record BDAR action taken When mission is complete as soon as practical repair the equipment system using standard maintenance procedures 11 13 TERMINAL LUGS GENERAL INFORMATION Terminal lugs are provi...

Page 199: ...1 Self Clinching Cable Straps LIMITATIONS These straps are not to be used under the following conditions In temperature environments which exceed 85 C 185 F On coaxial cables or bundles con taining c...

Page 200: ...all broken straps and strap ends that were cut off Figure 11 24 Self Clinching Cable Strap and Tool OPTION 2 Tie Tape LIMITATIONS 1 Do not use ties on that part of a wire group or bundle located insi...

Page 201: ...tring can cut into or deform insulation 2 Space ties at 12 inches or less 3 Record BDAR action taken When mission is complete as soon as practical repair the equipment system using standard maintenanc...

Page 202: ...URAL STEPS 1 Prepare coax cable Figure 11 26 Refer to Table 11 5 2 Slide shield sleeve inner sleeve and filler sleeve onto one of the coaxial cables in the given order 3 Splice the center conductor Us...

Page 203: ...e area so that the solder melts and flows Figure 11 29 Shield sleeve must overlap coax braid at both ends Use same reflector and tem perature Keep hot air away from tubing 6 Center and shrink the tubi...

Page 204: ...e 6 Record BDAR action taken When mission is complete as soon as practical repair the equipment system using standard maintenance procedures 11 19 COMPONENT BRIDGING GENERAL INFORMATION In most cases...

Page 205: ...acement Pins Sockets item 2 Appx B Insertion Extraction Tool item 2 Appx B Knife PROCEDURAL STEPS 1 Solder or crimp wires to pin sockets Figure 11 33 2 Insert the pins sockets into the connector TM 55...

Page 206: ...URAL STEPS 1 Obtain a replacement connector with a pigtail Replacement may be obtained from a crash damaged aircraft Cut pigtail so that splices can be staggered Figure 11 34 2 Remove damaged connecto...

Page 207: ...DAR Repair LIMITATIONS None LIMITATIONS Emergency repair PERSONNEL TIME REQUIRED 1 Soldier 20 Minutes MATERIALS TOOLS REQUIRED Salvaged Circuit Breaker Electrical Tape item 49 Appx C PROCEDURAL STEPS...

Page 208: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 35 Circuit Breakers 11 36...

Page 209: ...e 11 37 Slip 1 inch piece of insulation over side Pull tight against the piece of insulation and twist tight Insulate bare end of terminal lugs on both sides of 1 inch piece of insulation with tape Us...

Page 210: ...p around the repair and tie with string 6 Same lengthen repair procedure bus bars Figure can be used to 11 39 7 Record BDAR action taken When mission is complete as soon as practical repair the equipm...

Page 211: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 39 Lengthening Bus Bars 11 39 Figure 11 38 Splicing Bus Bars...

Page 212: ...dily injury and equip ment damage may result if any metal tools or parts accidentally cause a short circuit 4 To remove bad cells use a 3 8 inch socket or equivalent to loosen and remove terminal scre...

Page 213: ...s Xl and X2 to the aircraft fuselage ground Figure 11 41 One of the two terminals should have 24 28 V dc on it when the power relay control circuit is energized No dc voltage indicates ELECTRICAL AND...

Page 214: ...practical repair the equipment system using standard maintenance procedures OPTION 2 Creating a Jumper for Damaged Power Relays CAUTION Do not jumper battery relay on an aircraft This procedure is to...

Page 215: ...NG PART DESIGNATION NUMBER FUNCTION K6 MS24183D1 Relay BATTERY K1 MS24183D1 Relay External Pwr K11 3S2791G200F 9 Relay Gen Fail K12 MS24183D1 Relay Line Cont K3 MS24183D1 Relay Non Ess Bus BT1 BB 4761...

Page 216: ...tion contains expedient repair procedures to restore radio communication needed to complete the mission GENERAL INFORMATION These procedures give instructions for use of substitute and or construction...

Page 217: ...tennas may also be used as emergency transmitting anten nas by using either coax cable 1 ARC 114 102A or 1 ARC 114 103A connected to J2 TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM 7 To replace No...

Page 218: ...length of the required radiating element Remove the outer insulation and shield from the piece of coax cable and then strip a 1 inch piece of insulation from each end exposing the center conductor Fig...

Page 219: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 45 Preparation of Coax 11 47...

Page 220: ...e coax antenna by wrapping and twisting it around the plug where the coax was disconnected 9 Secure with tape to hold the antenna and coax in place inside the tail boom Replace the structural panel an...

Page 221: ...TM 55 1520 228 BD ELECTRICAL AND AVIONICS SYSTEM Figure 11 47 Installation of Field Expedient Antenna 11 49 11 50 Blank...

Page 222: ......

Page 223: ...inches b Tubing in the OH 58 fuel system is limited to the fuel vent line When damage occurs to any of the lines tubes or hoses they may be substituted with a flexible type hose from the kit c If hos...

Page 224: ...ADAPTER ON HELICOPTERS EQUIPPED WITH CLOSED CIRCUIT REFUELING PROVISIONS 1 Cover Assembly 2 Low Level Switch 3 Lower Transmitter 4 Fuel Pump 5 Fuel Shut Off Valve 6 Fuel Shut Off Cable 7 Fuel Shut Off...

Page 225: ...TM 55 1520 228 BD FUEL SYSTEMS Table 12 1 Fuel System Assessment Procedures 12 3...

Page 226: ...ch Knife PROCEDURAL STEPS 1 Defuel the fuel cell by the following procedure a Remove the fuel drain cover panel b Push or twist drain valve located under aircraft where fuel pump is located c Place a...

Page 227: ...TM 55 1520 228 BD FUEL SYSTEMS Figure 12 2 Emergency Mechanical Clamp Repair 12 5...

Page 228: ...Mix the adhesive as described below in steps 5a thru 5h refer to Figure 12 3 Wear goggles or other eye protec tion during all operations a Remove the tape band from Semkit cartridge and pull the mixi...

Page 229: ...osition until the adhesive sufficiently sets approx 30 min NOTE Allow the adhesive to cure for two hours before refueling 9 Tighten drain valve and install cover plate 10 Refuel the aircraft 11 Record...

Page 230: ...e rubber plug and insert it through the hole in the cell NOTE Retain cord to prevent loss of plug in the cell 9 Pull the plug into position and rotate it in position to smooth out the adhesive interfa...

Page 231: ...TM 55 1520 228 BD FUEL SYSTEMS Figure 12 4 Rubber Repair Plug Assembly Figure 12 5 Plug Modification for Three Plane Repair 12 9 12 10 Blank...

Page 232: ......

Page 233: ...apa bilities Refer to Table 13 1 for assessment procedures a Force Trim System If the force trim system is malfunctioning the aircraft is still fully mission capable with no limitations presented b Co...

Page 234: ...Figure 13 1 OH 58 Flight Controls Schematic 13 2 TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM...

Page 235: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM Table 13 1 Flight Control System Assessment Procedures 13 3...

Page 236: ...ize tubes Holes should go through the splicer and the damaged tube and should be positioned in a cross pattern Figure 13 7 Make sure that the original center to center length b Figure 13 6 is maintain...

Page 237: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM Figure 13 2 Collective Flight Control 13 5...

Page 238: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM Figure 13 3 Cyclic Flight Control 13 6...

Page 239: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM Figure 13 4 Flight Control Actuators 13 7...

Page 240: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM 13 8 NOTE THIS IS A CONFIGURATION OF THE OH 58A SERIES HELlCOPTER Figure 13 5 Anti Torque Controls Sheet 1 of 2...

Page 241: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM NOTE THIS IS A CONFIGURATION OF THE OH 58C SERIES HELlCOPTER Figure 13 5 Anti Torque Controls Sheet 2 of 2 13 9...

Page 242: ...TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM Refer to Figures 13 2 thru 13 5 Figure 13 6 Control Tube Dimensions Figure 13 7 Suggested Repair for Control Rods or Tubes 13 10...

Page 243: ...206 001 020 67 206 001 020 69 206 001 020 59 206 001 020 29 206 001 020 33 206 001 096 25 206 001 021 13 1 1 3 8 2 1 3 8 3 4 3 4 3 4 5 8 5 8 1 1 8 1 1 8 1 7 8 7 8 15 16 1 15 16 9 16 9 16 1 1 16 1 1 1...

Page 244: ...Figure 13 8 Control Rod with Bearing and Clevis Assemblies 13 12 TM 55 1520 228 BD FLIGHT CONTROLS SYSTEM...

Page 245: ...BD FLIGHT CONTROLS SYSTEM Figure 13 9 Flattened End of Fabricated Flight Control Figure 13 10 Corner Rounding on Fabricated Flight Control Figure 13 11 Bearing Assembly Connection of Fabricated Flight...

Page 246: ...termine the 6 Record BDAR action taken When correct distance between holes of the mission is complete as soon as flight tube Mark this distance Drill practical repair the equipment system the hole and...

Page 247: ...ng repair options OPTION 1 Splice Repair LIMITATIONS None PERSONNEL TIME REQUIRED 1 Soldier 2 Hours MATERIALS TOOLS REQUIRED Flat or Round Piece of Material Example engine cowl hold open rod Drill wit...

Page 248: ...TM 55 1520 228 BD UTILITY SYSTEMS Figure 14 1 Engine De Ice System 14 2...

Page 249: ...the instrument panel in full view of the pilot WARNING If CO indicator is noted to be dark turn off heater pull fire wall shut off open vents and land as soon as practicable 15 3 ASSESSMENT PROCEDURE...

Page 250: ...TM 55 1520 228 BD ENVIRONMENTAL CONTROL SYSTEM Figure 15 1 Bleed Air Heating and Ventilating System A C 15 2...

Page 251: ...alve Plenum Remote Sensor Fresh Air Inlet Post Plenum Air Distribution Valves 11 12 13 14 15 16 17 18 20 Windshield Defog Nozzle Plenum Drain Plenum Valve Assembly Ventilating and Defogging Blower Ram...

Page 252: ...Air Inlet 9 Center Post Duct 10 Air Distribution 11 Windshield Defog Nozzle 12 13 14 15 16 17 18 19 20 21 Plenum Drain Plenum Valve Assembly Ventilating and Defogging Blower Ram Air Intake Grill Air...

Page 253: ...13 14 Combustion Heater Plenum Fuel Shut Off Valve Fuel Pump Fuel Pressure Relief Valve Fuel Filter Heater Combustion Blower Air Scoop Igniter Plug Duct Firewall Shut Off Control Temperature Control...

Page 254: ...ng Valve 7 Firewall Shut Off Valve 8 Air Mixing Valve Control 9 Firewall Shut Off Valve 10 Control 11 Defogger Distribution Valves Cockpit Distribution Valves Cabin Distribution Valves Fan Air Intake...

Page 255: ...TM 55 1520 228 BD ENVIRONMENTAL CONTROL SYSTEM Table 15 1 Assessment Procedures 15 7...

Page 256: ...aintenance procedures LIMITATIONS Inspect after every flight 15 6 FLEXIBLE DUCT DAMAGE PERSONNEL TIME REQUIRED 1 Soldier 1 Hour MATERIALS TOOLS REQUIRED 0 016 inch Sheet Metal Minimum Sealant item 4 A...

Page 257: ...e 0 042 inch item 27 Appx C PROCEDURAL STEPS 1 Locate damaged area and remove panels and other items as necessary to gain access to the line to be repaired Refer to Figure 15 6 for locations of bleed...

Page 258: ...TM 55 1520 228 BD ENVIRONMENTAL CONTROL SYSTEM Figure 15 6 Bleed Air Line Installation 15 10...

Page 259: ...TM 55 1520 228 BD ENVIRONMENTAL CONTROL SYSTEM Figure 15 7 Bleed Line Patch Repair 15 11 15 12 Blank...

Page 260: ......

Page 261: ...OR FOR TRAINING AT THE DISCRETION OF THE COMMANDER AUTHORIZED TRAINING FIXES ARE LISTED IN APPENDIX E IN EITHER CASE DAMAGES SHALL BE REPAIRED BY STANDARD PROCEDURES AS SOON AS PRACTICABLE There are n...

Page 262: ......

Page 263: ...IN COMBAT OR FOR TRAINING AT THE DISCRETION OF THE COMMANDER AUTHORIZED TRAINING FIXES ARE LISTED IN APPENDIX E IN EITHER CASE DAMAGES SHALL BE REPAIRED BY STANDARD PROCEDURES AS SOON AS PRACTICABLE...

Page 264: ......

Page 265: ...for use by repair personnel to accomplish the instructions set forth in this TM PUBLICATION NUMBER TITLE DA PAM 738 751 Functional User s Manual for the Army Mainte nance Management Systems Aviation...

Page 266: ......

Page 267: ...s spe and durable supplies not listed in other cial tools and test equipment Several appendices Each kit contains its own special tools are contained in the BDAR inventory list and tool usage instruc...

Page 268: ...4920 01 266 7534 Fluid Line Repair Kit Special and 78286 Common Tools for Tubing and Hose 70700 20900 041 Repair Including Repair Parts 5 Not Assigned Fuel Cell Repair Kit 6 Not Assigned High Energy...

Page 269: ...Expendable Items Except Medical Class V Repair Parts Heraldic Items or CTA 8 1OO C 2 EXPLANATION OF COLUMNS and a Item Number This number is assigned to the entry in the listing and is referenced in t...

Page 270: ...4 33564 EA9340 Adhesive EX1675 B2 Pro Seal 890 B2 Adhesive General Purpose 81348 EC1300121 Adhesive Silicone Rubber 80244 MIL A 46106 Aliphatic Naphtha 81348 TTN95 Brush Stiff Fiber Bristle 80244 H B...

Page 271: ...348 QQ W 423 Lockwire Steel 0 041 81348 QQ W 423 Lubricating Oil MIL L 2104 Grade 30 15958 Lubricating Oil MIL L 23699 81349 Lubricating Oil MIL L 7808 81349 Nut Assortment 81348 FFN836 Packing Prefor...

Page 272: ...minal Quick Disconnect BX Wire Gage 16 14 MS27429 2 96906 58 5940 00 804 9185 Terminal Quick Disconnect BX Size 18 MS27429 1 96906 59 6810 00 664 0387 Trichloroethane 1 1 1 T 620 CN 81348 60 6515 00 3...

Page 273: ...junction with specification numbers to distinguish them from foreign pro ducts The identification of NATO product numbers relate directly to U S Military Specification numbers and thus are considered...

Page 274: ...06 00 206 4911 5306 00 141 4511 1005 00 832 4549 1005 00 921 6241 2925 00 444 1186 5310 00 807 1474 5310 00 844 4872 5310 00 807 1467 5310 00 807 1475 5310 00 807 1469 5340 00 921 5135 5305 00 X86 301...

Page 275: ...x x x x x VERTICAL SPEED IND 6610 00 935 4278 x x x x x x VOLTMETER INDICATOR 6625 00 003 8745 x x x x x PRESSURE ALTIMETER 6610 00 110 3368 x x x x x x x x VERTICAL SPEED INDICATOR 6610 00 029 6703...

Page 276: ...x x x x AN ARC 114 5821 00 935 5071 x x x x x RADIO SET AN ARC 115 5821 00 935 5072 x x x x x INVERTER 5841 01 140 0941 ELECTRICAL INDICATOR 6620 01 065 3740 x x x x x x HOT AIR MIXING VALVE 4810 01 0...

Page 277: ...subcomponents of the major components may be removed and substituted however the level of disassembly must be consistent wlth the field tools and skill levels available D 5 Table D 2 Spare and Repair...

Page 278: ...oint and cloud point b Some substitute fuels which alone cannot be used on the OH 58 helicopter can be blended with a primary fuel and can then be utilized for engine operation c When using substitute...

Page 279: ...T 5624 JP 5 NATO F 44 Aviation Turbine ASTM D 1655 Jet B Aviation Turbine MIL T 83133 JP 8 NATO F 34 Aviation Turbine ASTM D 1655 Jet A 1 Fuels for JP 4 EXPEDIENT FUEL Kerosene ASTM D 3699 Kerosene N...

Page 280: ...a AF Iss 3Amd 2 n a AF FRANCE AIR 3407 B AF AIR 3405 C n a AF FEDERAL REPUBLIC TL 9130 006 Iss 4 TL 9130 007 Iss 4 OF GERMANY n a AF n AF Grade JP 4 n AF ITALY AA M C 142p AA M C 143b AA M C 141d n a...

Page 281: ...ing B P A T G B P A T K Caltex Petroleum Corp Caltex Jet B Caltex Jet A 1 City Service Co CITCO A Continental Oil Co Conoco JP 4 Conoco Jet 50 Conoco Jet 60 Exxon Co U S A Exxon Turbo Fuel B Exxon A E...

Page 282: ...y Fuel Any Primary or Alternate Fuel Any Primary or Alternate Fuel Any Alternate or Primary Fuel Any Alternate Fuel Any Alternate Fuel MIL F 815 Distillate NATO F 76 Navy Distillate Dry Cleaning Solut...

Page 283: ...term performance therefore they are recommended only as a last resort c Expedient lubricants can cause one of three problems 1 They may not allow proper efficient operations because of improper viscos...

Page 284: ......

Page 285: ...ct Hose Damage HYDRAULIC SYSTEM Lines and Hoses Aluminum Tube Damage Hydraulic Hose Damage ELECTRICAL AND AVIONICS SYSTEM Splicing Unshielded Wires Damaged Wire Insulation Shielded Cable Repair Shield...

Page 286: ...AR FIXES AUTHORIZED FOR TRAINING Cont REPAIR PROCEDURE PARA NO FLIGHT CONTROL SYSTEM Tubes Flight Control 13 4 ENVIRONMENTAL CONTROL SYSTEM Rigid Plastic Ventilation Duct 15 5 Flexible Duct Damage 15...

Page 287: ...n aid to expedient repair techniques described in Chapter 11 F 2 GENERAL The actual configura tions may vary depending on particular requirements or changes incorporated through modification work orde...

Page 288: ...TM 55 1520 228 BD APPENDIX F Figure F 1 Intercom System Sheet 1 of 2 F 2...

Page 289: ...gure F 1 Intercom System Sheet 2 of 2 Table F 1 Wiring WIRE NUMBER TYPE 1 C6533A 3A22 RED 1A22 GRN 45A22 1OA22 14A22 18A22 C6533B 3A22 RED 1A22 GRN 45A22 1OA22 14A22 18A22 C6533C 3A22 RED 1A22 GRN 45A...

Page 290: ...TM 55 1520 228 BD APPENDIX F NOTE THIS UNIT IS A CONTROL PANEL ONLY IN AIRCRAFT USING AN ARC 51BX TRANSMITTER Figure F 2 UHF AM Communication System Sheet 1 of 2 F 4...

Page 291: ...2 Wiring Table UHF AM Communication System WIRE NUMBER OH 58A ARC51 124A20 125A20 128A20 RED 129A20 BLK 131A20 140A ARC116 10A22 101A 101B SAME WIRING USED FOR AN ARC 164 OH 58C ARC116 1OB22 RED 11B22...

Page 292: ...TM 55 1520 228 BD APPENDIX F Figure F 3 VHF AM Communication System and Connecting Cables Sheet 1 of 2 F 6...

Page 293: ...lug Connector Electric Connector Electric Figure F 3 VHF AM Communication System and Connecting Cables Sheet 2 of 2 Table F 3 WIRE NUMBER OH 58A ARC115 1OA22 101A 101B ARC115 101C OH 58C ARC115 1OB22...

Page 294: ...0 028 206 022 114 1 206 022 114 3 KC 59 212 KC 19 120 Filter Low Pass Board Capacitor A3 Radio Set No 1 FM Radio Set No 2 FM Control Indicator TSEC KY 28 Antenna No 2 FM Antenna R H No 1 FM Com Securi...

Page 295: ...SHIELD SHIELD COAX COAX COAX COAX COAX PR S PR S COAX COAX Wiring Table VHF FM END 1 P209 B P209 J P209 K P209 L P209 T P209 U P209 V P209 c P209 d P209 e P21O P239 J242 P211 P212 P207 P208 P315 P209...

Page 296: ...TM 55 1520 228 BD APPENDIX F Figure F 5 Gyromagnetic Compass Set AN ASN 43 and Connecting Cables Sheet 1 of 2 F 10...

Page 297: ...agnetic Compass Set AN ASN 43 and Connecting Cables Sheet 2 of 2 Table F 5 Wiring WIRE NUMBER TYPE TN1705D22 10A22 BLU 11A22 GRN 12A22 YEL 13A22 14A22 15A22 20A22 BLU 21A22 GRN 22A22 YEL SHIELD TWT S...

Page 298: ...TM 55 1520 228 BD APPENDIX F Figure F 6 Direction Finder Set AN ARN 89 Sheet 1 of 2 F 12...

Page 299: ...ce Matching 206 032 310 3 Antenna Sense AS 2108 ARN 89 Antenna Loop Direction Finder Set AN ARN 89 Sheet 2 of 2 SHIELD SHIELD SHIELD COAX COAX COAX COAX SHIELD SHIELD SHIELD SHIELD COAX COAX COAX COAX...

Page 300: ...TM 55 1520 228 BD APPENDIX F Figure F 7 Radio Receiving Set AN ARN 123 V 1 Sheet 1 of 2 F 14...

Page 301: ...TWT S 33A22 WHT TWT S 33B22 SHIELD 33A22 BLU TWT S 34A22 BLU SHIELD 33C22 34A22 WHT TWT S 35A22 WHT PR S 35A22 BLU PR S 36A22 WHT PR S 36A22 BLU PR S 38A22 WHT PR S 38A22 BLU PR S 38B22 39A22 WHT PR S...

Page 302: ...TM 55 1520 228 BD APPENDIX F Figure F 8 Radar Altimeter System AN APN 209 Sheet 1 of 2 F 16...

Page 303: ...N18 Resistor Fixed Connector Plug Electric Connector Plug Connector Plug IND RCVR Transmitter Connector Plug Antenna Connector Plug Antenna Knob Control Radar Altimeter System AN APN 209 Sheet 2 of 2...

Page 304: ...206 077 109 1 KIT 1A TSEC MT 3513 APX AT 884 APX MT 3809 APX 72 Test Set Transponder Receiver Transponder Control Transponder APX Transponder The APX 1OO V Used On The OH 58C Does Not Require The TS...

Page 305: ...SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD SHIELD COAX COAX COAX COAX COAX COAX P234 SPLICE P234 P234 P234 P234 P234 P234 P...

Page 306: ...APX1OO 5O2OA PR S PR S COAX COAX SHIELD COAX COAX COAX COAX Table IFF END 1 341OTR1P1 341OTR1P1 341OTR5P1 341OTR4P1 341OTR1P1 341OTR1P1 341OTR1P1 341OTR1P1 341OTR1P1 21 23 19 43 45 47 49 J600 J600 341...

Page 307: ...2892 APR 39 V R 1838 APR 39 AS 2890 APR 39 V CM 440 APR 39 V C 9326 APR 39 V AS 2891 APR 39 V R 1838 APR 39 V Antenna Left Spiral Indicator Radar Signal Antenna Right Spiral Antenna Left Spiral Recei...

Page 308: ...1P1 3422Z1P1 3422Z1P1 3422Z1P2 3422DS1P1 3422Z1P1 3422Z1P1 3422A1P1 TB20 TB20 3422Z1P1 3422RE1P3 3422RE2P3 3422RE2P4 3422RE1P4 3422Z1P2 3422Z1P1 3422RE1P5 3422RE2P5 3422A1P1 TB20 TB20 3422Z1P1 PIN 8 1...

Page 309: ...ght Controls System Fuel Systems Hydraulic Power Plant Rotors Utility Systems Battery Repair BDAR Characteristics Bleed Air Line Damage Blending Fuels Bus Bars Cap or Longeron Damage Cap Skin Web Doub...

Page 310: ...tion Environmental Control System Bleed Air Line Damage Flexible Duct Damage Rigid Plastic Ventilation Duct Flexible Duct Damage F Flight Controls System Subsystems and Assemblies Frame Bulkhead Skin...

Page 311: ...4 Inches Diameter Maximum Manner of Blending Fuels N O Oil Hoses and Lines Leaks or Restriction Crimp Oil Lines Rigid Type Repair Oil Pressure Transmitter Leak 0il Tank Punctured Operating Characteri...

Page 312: ...8 5 11 10 11 8 11 9 5 7 4 16 11 5 4 4 11 25 19 2 Shielded Cable Repair Segments Skid Damage Skin Stiffener Damage Splicinq Unshielded Wires Structural Damage Assessment and Repair Substitute Emergenc...

Page 313: ...TM 55 1520 228 BD INDEX INDEX Cont Paragraph U V Waiver of Precautions Window Shield Window Damage 4 21 Wire Bundle Tie Wraps 11 14 Wire Repair Segments Unshielded Wires 11 6 XYZ INDEX 5 INDEX 6 Blan...

Page 314: ......

Page 315: ...and parts creates a component The actual fit between two or more mating parts with respect to the amount of clearance or interference between them A procedure to rapidly determine what is damaged whe...

Page 316: ...metal structural elements Loss of metal resulting from overheating The smoothing of a metal surface by mechanical action without loss of material Generally found on plain bearing surfaces Surface dis...

Page 317: ...materials which are consumed by usage or which have a one time usage in depot maintenance activity The inner layer of material used to construct honeycomb structural panels Surface chemical action wh...

Page 318: ...ir technique A broad ridge or pair of ridges projecting from the edge of a structural element providing additional strength or a place for attachment FLAKING Loose particles of metal or evidence of se...

Page 319: ...ed as a protective cover A cavity with smooth bottom or sides which can occur on rolling contact surfaces A critical examination of parts to determine their use fulness or condition The joining point...

Page 320: ...nal Stock Identification Number NIIN A local break or notch in the edge of material Performance of a practical functional action A specific BDAR repair technique often non standard in nature The proce...

Page 321: ...t or skin due to overstress hostile fire Very deep scratches caused by foreign particles between surfaces that are moving or between one moving and one stationary surface Scores follow the travel dire...

Page 322: ...ent further propagation of the crack A longitudinal fore and aft structural element used in semimonocoque design which stiffens the skin Often called a stiffener As used herein the checking or operati...

Page 323: ...ates Army Chief of Staff THOMAS F SIKORA Brigadier General United States Army The Adjutant General DISTRIBUTION To be distributed in accordance with DA Form 12 31 AVUM and AVIM Maintenance requirement...

Page 324: ......

Page 325: ...8 redstone army mil Subject DA Form 2028 1 From Joe Smith 2 Unit home 3 Address 4300 Park 4 City Hometown 5 St MO 6 Zip 77777 7 Date Sent 19 OCT 93 8 Pub no 55 2840 229 23 9 Pub Title TM 10 Publicatio...

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Page 327: ...IONS EXCEPT RPSTL AND SC SM AND BLANK FORMS PUBLICATION FORM NUMBER TM 9 1005 433 24 DATE 16 Sep 2002 TITLE Organizational Direct Support And General Support Maintenance Manual for Machine Gun 50 Cali...

Page 328: ...ISTS AND SUPPLY CATALOGS SUPPLY MANUALS PUBLICATION NUMBER DATE TITLE PAGE NO COLM NO LINE NO NATIONAL STOCK NUMBER REFERENCE NO FIGURE NO ITEM NO TOTAL NO OF MAJOR ITEMS SUPPORTED RECOMMENDED ACTION...

Page 329: ...TION FORM NUMBER DATE TITLE ITEM NO PAGE NO PARA GRAPH LINE NO FIGURE NO TABLE NO RECOMMENDED CHANGES AND REASON Reference to line numbers within the paragraph or subparagraph TYPED NAME GRADE OR TITL...

Page 330: ...NO OF MAJOR ITEMS SUPPORTED RECOMMENDED ACTION PART III REMARKS Any general remarks or recommendations or suggestions for improvement of publications and blank forms Additional blank sheets may be use...

Page 331: ...yards square miles acres cubic feet cubic yards fluid ounces pints quarts gallons ounces pounds short tons pound feet pound inches To 1 cu centimeter 1000 cu millimeters 06 cu inch 1 cu decimeter 1000...

Page 332: ...P I N 0 6 6 6 3 5 0 0 0...

Page 333: ...it They did not even scan it Why should they get your money Why are not letting you give those free manuals to your friends I am setting this document FREE This document was made by the US Government...

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