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MAULE MX-7-420 TURBO-PROP Maintenance Manual

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MAULE MX-7-420
TURBO-PROP
Rev. A

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Summary of Contents for MAULE MX-7-420 TURBO-PROP

  • Page 1 MAULE MX-7-420 TURBO-PROP Rev. A...

  • Page 2: Foreword

    The Maule M-7 is designed and built to give you the airplane you have always wanted. It is fast, comfortable, and easy to fly, yet no light airplane is safer than the Maule M-7. Its sturdy construction means you will not have to pamper it to enjoy long years of trouble-free service.

  • Page 3: Table Of Contents

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL M-7-420A TABLE OF CONTENTS ITEM PAGE Foreword..............….….. i Warranty....…..........……… i Table of Contents…......…......ii Log of Revisions…........……..... iii GENERAL DATA SECTION I - General Description........……....1 Design Specification..........……... 1 Fluid Capacities and Specification......……..2...

  • Page 4: Log Of Revisions

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 LOG OF REVISIONS Rev. Description Date Page(s) 3, 19, Added oleo strut oil API GL-4 or GL-5 85W-140 gear oil for 04/16/16 23, 24 new oleo spring P/N 4161B. Rev. A...

  • Page 5: Section I

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 SECTION I GENERAL DATA GENERAL DESCRIPTION: Type: Four/five place high wing cabin monoplane. Engine Installation: Single tractor engine in nose of fuselage. Wing: Strut braced, two spar, metal covered, modified USA 35-B airfoil. Fiberglass wing tips.

  • Page 6: Fluid Capacities And Specification

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Areas: a. Wing, Aileron and Flaps 157.9 sq.ft. b. Ailerons (total) 12.6 sq.ft. c. Flaps (total) 24.8 sq.ft. d. Horizontal Stabilizer 18.1 sq. ft. e. Elevators (including tab) 14.1 sq. ft. Vertical Stabilizer 13.1 sq.
  • Page 7 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Emergency Mil-G-5572F, Aviation Gasoline, all grades (aircraft boost pump on; maximum of 6 hours operation per overhaul period of turbine through an engine operat- ing range of idle to 90% maximum SHP.) CAUTION: MIL-G-5572 fuel containing tricresylphosphate (TCP) additive shall NOT be used.

  • Page 8: General Maintenance

    "electrolyte corrosion". Salt water and chemicals act as an electrolyte between dissimilar metals and can start a strong corrosive action over a short period of time. Maule makes every effort to separate dissimilar metals with primers and coatings during manufacture, but there are some locations (such as rivets in wing skins) where this is impossible.
  • Page 9 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Care should be taken in the disposal of candy wrappers, paper scraps, cigarette butts, etc. These can work their way under the floorboards and become a fire hazard and moisture trap. NOTE: While washing the aircraft, ascertain that all drain holes are open. Clean out any debris blocking them.

  • Page 10: Inspection Guides

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 INSPECTION GUIDES AIRFRAME INSPECTION At 25 Hour Total Time, perform 50 Hour Inspection as described below: At 50 Hour Total Time and every 50 hours thereafter: 1. Check battery for general condition and electrolyte level.
  • Page 11 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.
  • Page 12 Long Island City, NY Tucker, GA NOTE: Maule Service Bulletin No. 9 covers corrosive resistant parts replacement and is particularly 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.
  • Page 13 18. Check and clean vacuum system regulator valve filter and intake filter. 19. Check the pitot static system for leaks. 20. Ensure that all applicable Airworthiness Directives and Maule Service Letters and Bulletins that are mandatory have been complied with.
  • Page 14 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Inspect the compressor scroll for cracks or breaks at the anti-ice valve and customer bleed ports. If cracks or breaks are detected, check engine for possible vibration causes. Inspect for discharge air tube inserts that are cocked or backing out of the scroll.
  • Page 15 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 3-232 Clean the burner drain valve. Inspect the ignition lead for burning, chafing, or cracking of 3-185 conduit and loose connectors and broken lock wire. Review engine records for compliance with all mandatory bulletins, inspections and airworthiness directives.
  • Page 16 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 3-108 Inspect and clean the fuel nozzle. Item 8, Table III-10 Inspect and clean the No. 1 bearing oil pressure reducer. Visually inspect external sump. Clean internal carbonaceous Item 11, Table III-10 deposits from sump.
  • Page 17 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 When changing from Engine Refer to Approved Oils, para MIL-L-7808 to MIL-L- As necessary lube oil 1-74. 23699 or vice versa Pressure Refer to applicable part of oil tube Inspect and clean screen Cleaning the Power Turbine 100 hr max.
  • Page 18 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Visually inspect for inter- External Clean or replace sump as nal carbonaceous depo- 300 hr max. sump required. sits. SPECIAL ENGINE INSPECTIONS Special inspections are required when the engine has been subjected to abnormal operating conditions, when engine damage is suspected, or when associated parts are removed from the engine.
  • Page 19 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 If the aircraft propeller strikes an object causing damage to the propeller blades requiring blade replacement and overhaul of the propeller assembly, remove the engine and send it to a designated overhaul facility for inspection.

  • Page 20: Rigging Procedures

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 RIGGING PROCEDURES 1. LEVELING: Laterally: The airplane can be accurately leveled laterally using the front spar attach bolts. Turn these two bolts so that a flat on the head is "up". Fabricate two equal length spacers (1½...
  • Page 21 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 4. TAIL ASSEMBLY: With the airplane in level position, the stabilizers should be leveled at their rear spars. The hinge line should be straight from tip to tip. The vertical stabilizer should be plumb at the hinge.

  • Page 22: Lubrication

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 10. RUDDER TAB: This tab is interconnected with the aileron system to automatically coordinate rudder with aileron to reduce adverse yaw. The tab should normally be streamlined with the rudder when the aileron and rudder controls are centered.

  • Page 23: Fabric Repairs

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 FABRIC REPAIRS: (Applicable to Polyurethane paint on Ceconite fabric only) REPAIRS: 1. Small holes and damaged areas can easily be repaired without removing the existing paint topcoat. 2. Trim the damaged area to a rectangular or circular shape.

  • Page 24: Major Component Parts

    The forward fuselage section is aluminum covered (2024-T3). The firewall is made of .018 galvanized sheet steel or stainless steel. The aft fuselage section is covered with Ceconite fabric and standard dope and paint finish as per Maule Specification S-17. This fabric need not be pulled or punch tested. Rev. A...

  • Page 25: Surfaces And Controls

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 SURFACES AND CONTROL AILERONS AND FLAPS: The ailerons and flaps are aluminum alloy structures covered with 2024-T3. The aileron control system consists of a chain drive connecting the two control wheels and is attached to the necessary cables which are routed over pulleys through the fuselage and into the wing section to the aileron horns.

  • Page 26: Landing Gear, Wheels And Brakes

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 LANDING GEAR, WHEELS AND BRAKES MAIN LANDING GEAR: MAIN LANDING GEAR: TOE-IN: If ground handling of the airplane makes toe-in suspect, inspect main landing gear as follows: With airplane unloaded, jack-up airplane on one side and spin tire. If center groove runs true, do same on other side.
  • Page 27 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 ASSEMBLY OF OLEO STRUT: Reassembly is the reverse of steps 5 and 6. Fill cylinder 1/2 full of New Holland No.134 hydraulic oil or Ford Tractor No. ESN-M2C134-D for P/N 4015B oleo spring. 10W30 engine oil may also be used. For P/N 4161B oleo spring use API GL-4 or GL-5 85W-140 gear oil.
  • Page 28 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 ¼ inch to top of cylinder.
  • Page 29 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 MAINTENANCE HINTS ON HYDRAULIC BRAKES: Excessive pedal travel: Probable cause Corrective Action Normal wear of brake pad at wheel If pad is worn thin, replace with new pad. Leak in system Inspect all attachments and fittings in brake system.

  • Page 30: Tailwheel

    TAILWHEEL The tailwheel assembly consist of a Maule SFS-P8B Full Swivel Steerable Tailwheel and a leaf type spring mounting. See Fig. 1 for detailed breakdown. If shimmy of the tailw- heel becomes a problem, it should be lubricated and adjusted as follows: A.
  • Page 31 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 C. ASSEMBLY Grease pack roller bearings (A5) and lock pin (13AB) with wheel bearing grease. Grease the parts adjacent to lock pin. Do Not grease friction washer (72B-4) or the parts adjacent to it.
  • Page 32 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Rev. A...

  • Page 33: Power Plant System

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Assemble lock ring (73B), arm (6) (with lock pin (13AB) and spring (14) installed), shield (36), and pins (60AB) together as a unit. Make sure that the key end of lock pin 13AB) is properly aligned with the slot in lock ring (73B).

  • Page 34: Fuel System

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 An extremely close visual inspection of the engine mount should be made to periodically check for cracks, dents, weld failures, etc., of the mount tubular members as well as the general condition of the mount. At regular intervals, the attaching bolts at the engine should be checked for tightness (required torque value of 37.5 - 41.5 ft.

  • Page 35: Electrical System

    MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 The fuel lines should be checked for cracks and chafing every 100 hours or annually and the external fuel filter should be cleaned at the same time. The auxiliary tank transfer pump strainers should be cleaned at the same interval. This is done by removing the pump bottom with a 5/8”...
  • Page 36 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 The generator output is monitored by reference to the ammeter located in the left side of the instrument panel. Should the generator of warning light illuminate, move generator switch from off to reset to on. If system will not reset, investigate the electrical system mal- function.

  • Page 37: Electrical Schematic

    MAULE AEROSPACE TECHNOLOGY, INC. M-7-420 MAINTENANCE MANUAL 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.
  • Page 38 MAULE AEROSPACE TECHNOLOGY, INC. M-7-420 MAINTENANCE MANUAL FOR Electrical Schematic – Sheet 2 of 3 28 Volt Rev. A...
  • Page 39 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Electrical Schematic – Sheet 3 of 3 28 Volt Rev. A...
  • Page 40 MAULE AEROSPACE TECHNOLOGY, INC. MAINTENANCE MANUAL MX-7-420 Rev. A...

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