Piper PA-31-350 T-1020 Navajo Aircraft Maintenance Manual PDF – P/N 761 768

Description

Piper PA-31-350 T-1020 Navajo Aircraft Maintenance Manual – P/N 761 768

The Piper PA-31-350 T-1020 Navajo Aircraft Maintenance Manual, part number 761 768, is the factory service reference for the PA-31-350 T-1020 airframe and every system installed in it. Piper wrote the book to the GAMA (General Aviation Manufacturers Association) format, so the contents are organized into numbered system chapters – chapter 32 is landing gear, chapter 71 is power plant, chapter 91 holds the charts and wiring diagrams – and each chapter breaks down further into sub-systems and individual units under the same numbering system. The manual was issued on September 2, 1981 and kept current through revisions dated October 7, 1994. All five Aerofiche cards are combined here into one continuous 1,131-page PDF.

File Details

• Manual type: Aircraft Maintenance Manual (GAMA format, five Aerofiche cards)
• Manufacturer: Piper Aircraft Corporation, Lakeland, Florida
• Model: Piper PA-31-350 T-1020
• Document number: 761 768
• Original issue: September 2, 1981
• Revisions incorporated through: October 7, 1994
• Language: English
• Page count: 1,131 pages
• File format: PDF

Chapters Covered

• 4 – Airworthiness Limitations
• 5 – Time Limits / Maintenance Checks: Continuous Inspection program, Event Inspections #1 through #4, special inspections, operational inspections and sign-off records
• 6 – Dimensions and Areas: leading particulars, station references, access plates and panels
• 7 – Lifting and Shoring: jacking arrangement
• 8 – Leveling and Weighing
• 9 – Towing and Taxiing: turning radius and limits
• 10 – Parking and Mooring
• 11 – Required Placards and Decals
• 12 – Servicing: fuel, brakes, hydraulics, oleo struts, tires, propellers, engine oil, oxygen, air conditioning and lubrication charts
• 20 – Standard Practices / Airframe: torque wrenches, Cherrylock rivet removal, fluid line identification, flareless tube fittings, corrosion control, painting
• 21 – Environmental System: heater, combustion air blower, air conditioning
• 22 – Autoflight
• 23 – Communications: emergency locator transmitter, avionics master and emergency switch circuit
• 24 – Electrical Power: alternator, battery, regulator, overvoltage control, ammeter
• 25 – Equipment / Furnishings: interior arrangement, cargo loading and cargo furnishings
• 27 – Flight Controls: control column, aileron and tab, rudder and tab, elevator and tab, flaps, stall warning
• 28 – Fuel: fuel cells, crossfeed and firewall shutoff valves, filter, electric fuel pump, boost pump, indicating
• 29 – Hydraulic Power: power pack, manifold, main and hand pump relief valves, hydraulic pump, shuttle valves
• 30 – Ice and Rain Protection: pneumatic deicer boots, windshield wiper mechanism, propeller deicing
• 32 – Landing Gear: main and nose gear, oleo struts, gear doors, emergency extension system, actuating cylinders, wheels, brakes, brake master cylinder, parking brake valve, wear limits
• 33 – Lights: interior, landing, position, strobe, recognition, logo
• 34 – Navigation and Pitot / Static: flight instruments, attitude and direction instruments
• 35 – Oxygen System
• 36 – Pneumatic System
• 37 – Vacuum System
• 39 – Electric / Electronic Panels and Multi-Purpose Parts
• 51 – Structures: repairs, fiberglass and thermoplastic repair, safety walk, radome boot and erosion shield, corrosion control
• 52 – Doors: cabin entrance, pilot door, emergency exit, cargo door, wing locker, forward baggage, door ajar switches
• 53 – Fuselage
• 55 – Stabilizers: control surface balancing, horizontal stabilizer, elevator, vertical stabilizer, rudder
• 56 – Windows: standard and heated windshield, side windows, storm window
• 57 – Wings: wing tip, attach fittings, aileron, flap
• 61 – Propellers: assembly, governor, synchrophaser
• 70 – Standard Practices – Engines
• 71 – Power Plant: cowling, cowl flap, mounts
• 73 – Engine Fuel and Control: fuel injector, fuel-air bleed nozzle, indicating
• 74 – Ignition: magnetos, starting vibrator, ignition harness, spark plugs
• 76 – Engine Controls
• 77 – Engine Indicating
• 79 – Oil System
• 80 – Starting
• 81 – Turbines: turbocharger, density controller, differential pressure controller, exhaust waste gate
• 91 – Charts and Wiring Diagrams
• 95 – Special Purpose Equipment: fabricated tools and test equipment

Taken as a whole, the manual gives a technician the full working picture of the PA-31-350 T-1020: how each system is built, how it is removed and reinstalled, what the correct clearances and tensions are, which components are matched or lapped assemblies that must be replaced together, and where the inspection program expects attention at 50, 100, 500, 1000 and 2000 hour intervals. Troubleshooting charts sit alongside the repair procedures throughout, so diagnosis and correction are covered in the same place.

Aircraft and Powerplant Covered

The document is written specifically for the Piper PA-31-350 T-1020. The powerplant section identifies the installed engines as Avco Lycoming TIO-540-J2B and LTIO-540-J2B units, rated 350 horsepower at 2575 RPM, driving Hartzell three-blade constant speed feathering propellers through F-6-24 series governors. Serial-number specific notes appear where procedures differ between production batches, including the 31-8253001 through 31-8253012 range, aircraft from 31-8353001 and up, and PA-31-7952001 and up.

Systems and Procedures in Depth

Several areas of the Piper PA-31-350 T-1020 maintenance manual go deeper than a typical owner-level book. The landing gear chapter carries the complete emergency extension system, including gas storage bottle weights, the rigging procedure after activation, and the nitrogen pressure test hookup for verifying system integrity at 1000 hour intervals. The hydraulic chapter documents the power pack down to individual valve assemblies – main relief, priority, time delay check, door vent, hand pump check and relief – with bench test pressure values and adjustment steps. Engine work is supported by magneto internal timing with the Scintillator rotor holding tool, harness repair down to ferrule and contact spring replacement, and turbocharger controller service covering both the density controller and the differential pressure controller. Structural coverage includes aluminum skin repair data, fiberglass fracture and patch procedures, and thermoplastic repair methods. Electrical content extends to the alternator paralleling system, Lamar regulator adjustment, and the complete schematic set in chapter 91.

Get the Full Piper PA-31-350 T-1020 Manual Instantly

Whether you are performing a scheduled inspection, chasing an intermittent landing gear fault, rigging flight controls, overhauling a hydraulic power pack, or simply replacing a fuel boost pump warning sensor, this manual supplies the procedure, the tolerance, and the reference figure for the job. Working from correct factory procedures and stated specifications is what keeps a twin like the PA-31-350 T-1020 airworthy and avoids the rework that comes from guessed clearances and improvised torque values. The complete 1,131-page PDF is delivered immediately after checkout – no shipping, no waiting on a physical binder, and it opens on any computer, tablet, or phone. Print the pages you need for the hangar floor, or keep the whole file on a shop laptop for quick reference.

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