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Rev. A

FOR

MAULE MX-7-420

TURBO-PROP

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Содержание MX-7-420 TURBO-PROP

Страница 1: ...Rev A FOR MAULE MX 7 420 TURBO PROP ...

Страница 2: ...rt or parts thereof which shall within ninety 90 days after delivery of such airplane to the original purchaser be returned to Maule with transportation charges prepaid and which upon Maule s examination shall dis close to its satisfaction to have been thus defective this warranty being expressly in lieu of all other warranties expressed or implied and all other obligations or liabilities on the p...

Страница 3: ...apacities and Specification 2 SECTION II GENERAL MAINTENANCE Cleaning and Care of Aircraft 4 Inspection Guides 6 Rigging Procedures 16 Lubrication 18 Fabric Repairs 19 SECTION III MAJOR COMPONENT PARTS Wings 20 Lift Struts 20 Fuselage 20 Surfaces and Controls 21 Landing Gear Wheels and Brakes 22 Tailwheel 24 Figure One 26 Power Plant System 27 Fuel System 28 Electrical System 29 Electrical Schemat...

Страница 4: ...ACE TECHNOLOGY INC MAINTENANCE MANUAL FOR MX 7 420 1 Rev A LOG OF REVISIONS Rev To Page s Description Date A 3 19 23 24 Added oleo strut oil API GL 4 or GL 5 85W 140 gear oil for new oleo spring P N 4161B 04 16 16 ...

Страница 5: ...lwheel Automatic locking Control Systems Dual controls wheels rudder pedals and brakes All controls direct ly cable driven Fuel control shut off valve is at the left lower side panel Mechanical flap and trim controls are at the center on the floor All other controls switches etc are instrument panel mounted DESIGN SPECIFICATIONS Wing Span 30 feet 10 inches Length 24 feet 5 inches Height 6 feet 4 i...

Страница 6: ... 0 gallons c Engine Oil Mil L 7808 and later and Mil 23699 and later 10 quart max d Brakes Texaco Aircraft Hydraulic Oil 15 MIL H 5606E or equiv 1 pint e Landing Gear For P N 4015B oleo spring use New Holland No 134 hydraulic oil or Ford Tractor No ESN M2C134 D 10W30 engine oil may also be used For P N 4161B oleo spring use API GL 4 or GL 5 85W 140 gear oil ENGINE FUEL SPECIFICATIONS Primary MIL T...

Страница 7: ...7808 and subsequent and MIL L 23699 series lubricating oils The vendor brands of MIL L 7808 and MIL L 23699 series lubricating oils which have been engine tested and accepted for use in the Model 250 engine are listed in the Approved Oils paragraph of Allison 250 BI7 Engine Series Operation Maintenance Manual Refer to para 1 73 Cold Weather Lubrication for the type of oil rec ommended at specific ...

Страница 8: ...ater using grit free soft cloth chamois or sponge Use of a dry cloth on Plexiglas will not only cause scratches but will also build up an electrostatic field which will attract dust to the surface Blotting with a clean damp chamois will remove the charge and the dust After cleaning polishing with a good Plexiglas cleaning product such as Mirror Glaze will keep the glass clean and help polish out m...

Страница 9: ...trickles through the seam stitches For best results stains especially those caused by grease or paint should be re moved from upholstery as soon as possible or they may become set and hard or impossi ble to remove Set stains should be removed carefully with a clean cloth dampened in de natured alcohol Stains caused by shoe polish can best be removed with turpentine How ever such cleaning agents ar...

Страница 10: ... not approved 5 Check aileron and flap skins for cracks 6 Check the security operation and general condition of all control surfaces 7 Check main landing gear for condition and brakes for leakage and wear 8 Check main landing gear oleo struts for oil leaks 9 Check general condition of tailwheel leaf springs and spring attachment Leaf springs should have 45 angle with no weight on the wheel Check a...

Страница 11: ... is being refinished WARNING Any unrepairable dents or punctures in strut are cause for replacement of the strut CAUTION This aircraft was equipped with sealed struts when manufactured however if these struts were replaced in field with unsealed struts comply with Maule Service Bulletin No 11 AD 98 15 18 as required New sealed struts are identified by two weld spots located at upper end Removal of...

Страница 12: ...ly recommended for airplanes operating in a potentially corrosive environment Compliance to this SB provides for larger stainless steel turnbuckles and corrosion re sistant steel fasteners and attachment details for the elevator cables 12 CAUTION Special attention should be given to the horizontal stabilizer strut lower attach tubes which are welded to the lower longerons The seal on the inside of...

Страница 13: ...tion 1 N A Inspect the engine for loose or missing bolts broken or loose connections security of mounting accessories and broken or missing lock wire Check accessible areas for ob vious damage and evidence of fuel or oil leakage 2 N A Check mounting and support bolts to be sure they are tight lockwired and in good condition Check security of screws and rivets Remove all foreign materials which mig...

Страница 14: ...ance with the Allison Commercial Engine Bulletin 250 B17TP CEB 1056 do not need period ic inspection and lubrication Clean and inspect any other starter generator gearshaft Clean the female splines of the starter generator with mineral spirits and a soft brush In spect splines in accordance with para 3 236 Starter Generator Gearshaft Female Spline Inspection Lubricate acceptable splines with greas...

Страница 15: ...ur Inspection In addition to the 100 hour and appropriate 200 hour inspection items perform the fol lowing 24 3 83 Inspect the compressor case when operating in an erosive environment 25 3 117 If the aircraft is equipped with an engine fuel filter differential pressure warning system replace the throw away filter only when an indication of contamination is obtained or every 300 hours whichever com...

Страница 16: ... pumps 600 HR 3 89 Make an installation rotating balance of the engine and propel ler at intervals not to exceed 600 hours 1500 HR 3 128 Replace fuel control strainer assembly 1750 HR 3 83 Inspect the compressor case Inspection frequency shall be made as necessary by operating environment In erosive envi ronment inspect case at least every 300 hours In any envi ronment do not exceed 1750 hours wit...

Страница 17: ...n plugs Inspect and clean 100 hr max Follow procedures in Mag netic Plug para1 172 8 No 1 bear ing oil pressure Inspect and clean 300 hr max Follow procedures in Oil Change para 3 163 9 No 6 7 and No 8 bearing pressure oil nozzle Inspect clean internal carbonaceous deposits When neces sary as di rected by the oil flow mea surement Refer to oil flow measure ment para 3 178 If an oil flow of less th...

Страница 18: ... the aircraft propeller comes in contact with the ground water trees or other obstacles The shock felt by the drive system requires that the engine be inspected and or overhauled by a designated overhaul facility as a result of possible damage If the aircraft propeller strikes an object causing damage to the propeller which can be cor rected by light grinding or filing and normal blending of the b...

Страница 19: ...with inlet air restricted due to foreign objects or materials which have become lodged in the compressor inlets Tag the replaced compressor to show that the cause of removal was inlet air blockage Condi tions which constitute blockage are as follows a Foreign objects or materials found in the inlet during inspection of the aircraft when not in operation If it can be determined that the blockage wa...

Страница 20: ...vets on the top of each wing from wingtip to wingtip at the front spar location Measure from the forward wing to fuselage attach bolt centerline for both left and right wings outboard 127 5 inches along the top of each front wing spar Using masking tape or equivalent tape the string down on the rivet centerline at this point At the inboard end of the front spar measure the distance from the top re...

Страница 21: ...dle at fully retracted handle down position for negative 7 1 up and 24 3 down for second notch and 40 3 down for third notch Adjustment if needed may be accomplished by adjusting turnbuckles lo cated above front seats through headliner 7 RUDDER Check the rudder travel for 21 1 right and left Rudder cable tension is controlled by springs and the cables should not be slack with the rudder centered R...

Страница 22: ...spring attached to the right rudder pedal It is not connected to the tab on the rudder LUBRICATION 1 Main wheel bearings Use good quality wheel bearing grease 2 Oleo shock struts For P N 4015B oleo spring use New Holland No 134 hydraulic oil or Ford Tractor No ESN M2C134 D 10W30 engine oil may also be used For P N 4161B oleo spring use API GL 4 or GL 5 85W 140 gear oil 3 Landing gear hinges Use en...

Страница 23: ... a coat of urethane adhesive thinned one to one 1 1 with urethane adhesive thin ner by volume to the primed area slightly larger than the repair patch size Allow this to dry for approximately 15 minutes 8 Apply a second coat of the thinned urethane adhesive and lay the patch in the wet bed of adhesive smoothing the edges while applying a topcoat of the thinned urethane adhe sive working he edges d...

Страница 24: ...applied After the primer is dried a finish coat of the desired color may be added WARNING Any unrepairable dents or punctures are cause for replacement of the strut See also page 8 item 7 FUSELAGE The fuselage is a welded truss type structure having an integral vertical tail fin Chrome molybdenum steel 4130 is used for all tube members control fittings floor supports and seat members Door frames a...

Страница 25: ...ttached to the inboard hinge fittings ELEVATORS The elevator has chrome molybdenum 4130 internal structure covered with Ceconite fabric Inspect for corrosion Drain grommets should be kept open The hinge attachments should be lubricated with light engine oil Accumulations of dust and dirt on hinges should be removed STABILIZERS The stabilizers have chrome molybdenum steel 4130 internal structures c...

Страница 26: ...s gear is supported by two spring oil type oleo struts which must be full of oil at all times The oil may be checked by removing a 1 8 pipe plug at the top end of the strut If oil is needed for P N 4015B oleo spring use New Holland No 134 hydraulic oil or Ford Tractor No ESN M2C134 D 10W30 engine oil may also be used For P N 4161B oleo spring use API GL 4 or GL 5 85W 140 gear oil DISASSEMBLY OF OL...

Страница 27: ... 7 Recheck and fill to top LANDING GEAR LEGS AND AXLE The landing gear is made of chrome molybdenum steel 4130 and has an aluminum skin 2024 T3 These need no maintenance other than inspection for corrosion The hinges should be lubricated every hundred hours using a light engine oil MAIN WHEELS AND BRAKES See Equipment Lists for items installed and options To change a tire follow these steps 1 Choc...

Страница 28: ...stall new cotter pin 16 Inspect brake pads Replace if necessary 17 Replace brake calipers and hub cap BRAKE CYLINDERS The hydraulic brakes are actuated by two 2 master cylinders Maule p n 4046B on the left side and two 2 slave cylinders Cleveland 10 54 on the right side Check hydraulic oil level in master brake cylinders proper level is no closer than inch to top of cylinder Add oil if needed Blee...

Страница 29: ...vals and keep reservoir full at all times 5 Vent plug stopped up If vent hole in reservoir plug becomes stopped there is a possibility that a partial va cuum will be created in the system which will interrupt the fluid flow in the system Clear vent hole 6 Improper bleeding air mixed with fluid Bleed brakes 7 Master cylinder cup or O ring wear Replace brake cylinder cups and O rings 8 Wheel cylinde...

Страница 30: ...remove the fork spindle from the rest of the as sembly Slowly rotate the fork back and forth while withdrawing it and collect the loose parts 4 Clean all of the metal parts in solvent Inspect all parts and replace any parts that exhibit excessive wear B SHIM SELECTION 1 Position the bearings A5 in bracket 71B and slide the fork 69B through the bearings Do not install any of the other parts at this...

Страница 31: ...per holes in bracket 71B Place friction ring assembly 72B 3 over the springs with the pin in the shallow hole in bracket 71B Grease may be used to hold the foregoing parts in place Do not allow any grease on the friction washer surface of the friction ring assembly 72B 3 3 Place shim s 83B on lower shoulder of the spindle on fork 69B Place the fric tion washer 72B 4 on the large diameter friction ...

Страница 32: ...MAULE AEROSPACE TECHNOLOGY INC MAINTENANCE MANUAL FOR MX 7 420 29 Rev A ...

Страница 33: ...n the bracket bolt and back off enough to install the cotter pin There must be no looseness or play between the bracket 71B and the spring 3 Install the connector springs using the heavier spring on the right side Install the springs so that the light spring is compressed approximately 1 2 to 3 4 inch 4 Inflate the tire to approximately 45 psi POWER PLANT SYSTEM The power plant system consists of ...

Страница 34: ...and care of the propeller COWLING The cowling consists of an upper and lower section Removal is accomplished by un locking the dzus fasteners and removing the AN526 screws A periodic inspection of the cowling should be made checking for cracks chafing secu rity of attachment etc EXHAUST SYSTEM Check exhaust pipes for cracks Check attachments for security Check the heater assembly for security and ...

Страница 35: ...l The battery supplies current for the airplane electrical system when the mas ter switch is in the ON position only The battery is the sealed type or the manifold vented type with the base being integrally vented Tubes attached to the case vent the battery to the fuselage bottom Battery caps should be kept tight to prevent electrolyte spillage If spillage does occur the affected area should be cl...

Страница 36: ...et to on If system will not reset investigate the electrical system mal function The generator Control Unit in the electrical system contains the following functions a Voltage regulator b Generator line contactor control c Overvoltage protection d Overload Undervoltage protection e Reverse current protection f Reverse polarity protection g Anti cycle protection h Latching field relay i Flash start...

Страница 37: ...INTENANCE MANUAL FOR M 7 420 34 Rev A Electrical Schematic Sheet 1 of 3 The wire numbering system has been designed to ease tracing a faulty wire The code is as shown below the schematic Wires are plainly labeled near each end 28 Volt ...

Страница 38: ...MAULE AEROSPACE TECHNOLOGY INC MAINTENANCE MANUAL FOR M 7 420 35 Rev A Electrical Schematic Sheet 2 of 3 28 Volt ...

Страница 39: ...MAULE AEROSPACE TECHNOLOGY INC MAINTENANCE MANUAL FOR MX 7 420 Rev A Electrical Schematic Sheet 3 of 3 28 Volt ...

Страница 40: ...MAULE AEROSPACE TECHNOLOGY INC MAINTENANCE MANUAL FOR MX 7 420 Rev A ...

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