Cheyenne PA-31T CHEYENNE User manual

AIRPLANE
SERVICE
MANUAL
CARD1 OF8
PA-31T
CHEYENNE
PA-31TCHEYENNE
II
PA-31T1
CHEYENNE
I
PA-31T1
CHEYENNE
IA
PA-31T2CHEYENNE
IIXL
PIPER
AIRCRAFT
CORPORATION
JULY
2,
1984
PART
NUMBER
753826 1A1 INTERIM
REVISION:
OCTOBER
15,1997
Courtesy of Bomar Flying Service
www.bomar.biz

PIPERCHEYENNE
SERVICEMANUAL
SERIAL
NUMBER
INFORMATION
PA-31T,CHEYENNE
Serial Numbers 31T-7400002to 31T-7720069 inclusive.
PA-31T,CHEYENNE II
Serial Numbers 31T-7820001
to 31T-8120104inclusive.
PA-31T1,CHEYENNE I
Serial Numbers 31T-7804001
to 31T-8104101inclusive.
PA-31T1,CHEYENNE IA
Serial Numbers 31T-8304001
to 31T-8304003inclusive;
(then, serial number serieschanged to)
Serial Numbers 31T-1104004
to 1104017inclusive.
PA-31T2,CHEYENNE IIXL
Serial Numbers 31T-8166001to 31T-8166076 inclusive;
(then, serial number series changed to)
Serial Numbers 31T-1166001
to 1166008inclusive.
AEROFICHE EXPLANATIONAND REVISION STATUS
Service manual information incorporated in this set of Aerofiche cards has been arranged in accordance
with general specifications of Aerofiche adoptedby General Aviation Manufacturer's Association, (GAMA).
Information compiled in this Aerofiche Service Manual will be kept current by revisions distributed
periodically. These revisions supersede all previous revisions and are complete Aerofiche card replacements
and supersede Aerofiche cards of same number in set.
Conversion of Aerofiche alpha/numeric code numbers:
First number is Aerofiche card number.
Letter ishorizontal line reference per card.
Second number is vertical line reference per card.
Example: 2J16 Aerofiche card number two of given set, Grid location J16.
Toaid in locating the various chapters and related service information desired, the following is provided:
1. At the beginning ofAerofiche Card No. 1:
a. A complete Section Index for allfiche in this set.
b. A complete list of Illustrations for all fiche in this set.
c. A complete list of Tablesfor all fiche in this set.
d. A complete list of Charts for all fiche in this set.
2. At the beginning of each subsequentAerofiche Card:
a. A complete Section Index for all fiche in this set.
b. A complete list of Illustrationsfor that fiche only.
c. A complete list of Tablesfor thatfiche only.
d. A complete list of Charts for that fiche only.
3. A complete Table of Contents showing paragraph titles and appropriate grid location numbers is
given at the beginning of each Section relating to the information within that Section.
4. Identification ofrevised material:
Revised text and illustrations are indicated by a black vertical line along the left-hand margin
of the frame, opposite revised, added or deleted material. Revision lines indicate only current
revisions with changes and additions to or deletions of existing text and illustrations. Changes in
capitalization, spelling, punctuation, indexing, physical location of material, or complete page
additions are not identified by revisionlines.
1A2 Interim
Revision:
10/15/97

PIPERCHEYENNE
SERVICEMANUAL
AEROFICHE EXPLANATIONAND REVISIONSTATUS(cont)
5. Revisions to Service Manual 753 826 issued December 1973are as follows:
Revision
ORG731208
CR810206
PR810923
PR810925
PR820215
PR821015
PR830425
PR840105
PR840323
PR840702
IR860220
IR860430
IR860821
IR871009
IR900313
IR941019
IR950320
IR971015 *
Publication Date
December 8, 1973
February 6, 1981
September 23, 1981
September25, 1981
February 15, 1982
October 15, 1982
April25, 1983
January 5, 1984
March 23, 1984
July 2, 1984
February 20, 1986
April 30,1986
August 21, 1986
June 15, 1988
March 13, 1990
October 19, 1994
March 20, 1995
October 15, 1997
Aerofiche Card Effectivity
1,2, 3,4, 5, 6, 7 and 8
1,2, 3, 4, 5, 6, 7 and 8
1Only
1,2, 3, 4, 5, 6, 7 and 8
1,2, 3, 4, 5, 6, 7 and 8
1, 2, 3, 4, 5, 6, 7 and 8
1, 2, 3, 4, 5, 6, 7 and 8
1,2, 3, 4,5, 6, 7 and 8
1,2, 3,4, 5, 6, 7 and 8
3
3
1
2
1
1and 2
1
1,2, 3,4, 5, 6, 7 and 8
* INTERIM REVISION TOSERVICE MANUAL 753-826
Revisions appearin all eightAerofiche cards. Discard your entire existing
Aerofiche card set (Cards 1- 8) and replace it with the revised Aerofiche
card set (Cards 1- 8) dated 10/15/97.
Consult the Customer Service InformationCatalog Aerofiche (P/N 1753-755)for current revision dates for this
manual.
Interim Revision: 10/15/97 1A3

PIPERCHEYENNE
SERVICEMANUAL
SECTION
INDEX
SECTION AEROFICHE
CARDNO.1 GRIDNO.
I INTRODUCTION 1A19
II HANDLING
ANDSERVICING 1A22
III INSPECTION 1D23
IV STRUCTURES 1E13
V SURFACE
CONTROLS 118
AEROFICHE
CARDNO.2
VI HYDRAULIC
SYSTEM 2A10
VII LANDING
GEARANDBRAKESYSTEM 2D19
VIII POWERPLANT(PA-31T
AND PA-31T1) 2111
AEROFICHE
CARD
NO.3
VIIIA POWER
PLANT
( PA-31T2) 3A8
IX FUELSYSTEM 3D7
X INSTRUMENTS 3F2
AEROFICHE
CARD
NO.4
XI ELECTRICAL
SYSTEM 4A7
AEROFICHE
CARD
NO.5
XII ELECTRONICS 5A9
XIII ENVIRONMENTAL
CONTROLSYSTEM
( PA-31T
ANDPA-31T1
) 5B1
AEROFICHE
CARDNO.6
XIIIA ENVIRONMENTAL
CONTROL
SYSTEM
(PA-31T2) 6A8
XIV ACCESSORIES
ANDUTILITIES 6C1
AEROFICHE
CARD
NO.
7
XV ELECTRICAL
SCHEMATICS
( PA-31T
ANDPA-31T1
) 7A5
AEROFICHE
CARD
NO.8
XVA ELECTRICAL
SCHEMATICS
(PA-31T2) 8A5
1A4 Interim Revision: 10/15/97

PIPER CHEYENNE SERVICE MANUAL
LISTOF ILLUSTRATIONS
Aerofiche
Figure Grid No.
2-1. Three View ofthe Piper Cheyenne (PA-31Tand PA-31T1) ...................................... 1B1
2-2. Three View ofthe Piper Cheyenne (PA-31T2)
..................................................... 1B2
2-3. Station Reference Lines .............................................................................. B3
2-4. AccessPlates and Panels, Fuselage, Interior, Fuselageand Empennage
(PA-31Tand PA-31T1).......................................................................... B6
2-5. Access Plates and Panels, Fuselage Interior,Fuselage and Empennage
(PA-31T2)
................... ............................................. B8
2-6. Access Plates and Panels, Wings ......... ................... ......... ................
1B10
2-7. Jacking Configuration (Typical)....................................... .. ................... 1B14
2-8. Weighing Configuration (Typical)
................................................................... B19
2-9. Leveling Longitudinally and Laterally
.............................................................. B20
2-10. TowTurn Limits and Radius
............................ B..............................B22
2-11. Service Points ......................................................................................... B24
2-12. Servicing Landing Gear Shock Struts............................................................... C4
2-12a. Tire Balancer......... ..................................................................... C7
2-12b. Aircraft Lubrication Charts ..................................... ................................ C14
2-13. Fabricated Jack Stand forPiper Jack, Part No. 18338-0
.......................................... 1D9
2-14. Fabricated TailStand .................................................................... ID10
2-15. Protective Closures Installation...................................................................... 1D11
2-16. Special Tools................................................................... ............. D16
3-1. Wing Flap Transmission Inspection................................................................ 1E2
3-2. Wing Flap Actuator Cable .......................................................................... 1E3
3-3. Friction Reduction in Wing Flap System ........................................................... 1E6
3-4. Wing Flap Motor
......... .. ......... .................................................... E8
3-5. Inspection of Aileron Sprocketand Chain....................................... 1E9
3-6. V-Band Coupling Lock Wire ................................................ ...................
4-1. Aileron and Flap Installation......................................................................... E18
4-2. Methods of Blocking TrimCables .................................................................. 1E21
4-3. Fuselage Cradle (Typical)............................................................................ E24
4-4. Wing Installation................... ........................................... F2
4-5. Empennage Installation ......... .......................................................... 1F5
4-6. Windshield Installation (Earlier Models) .......... ...... .................. .......... .... F16
4-6a. Heated Windshield (Earlier Models)................ ...................................... 1F17
4-7. Windshield Installation (Later Models)............................. ................................ F18
4-7a. Heated Windshield (Later Models).................................................................. 1F20
4-8. Windshield Wiper(PA-31T,PA-31T1)
......... .. ......... ...................... 1F21
4-8a. Windshield Wiper(PA-31T2)
........................................................................ F23
4-9. Emergency Exit and Eyebrow Window
............................................................. F24
4-9a. Storm Window Installation ......... ................................................. G3
4-10. Cabin EntranceDoor ............. ........................................................ 1G7
4-11. Cargo Door Installation ............ ............................................ G12
4-12. Checking Aileron Balance ................................................. .............. 1G19
4-13. Checking ElevatorBalance ..................... .....................
.......
.. 1G19
4-14. Elevator BalanceWeight Modification ...................................... G.........
.......... .20
4-15. Checking RudderBalance ......... ............................................................. 20
4-16. Elevator Friction Measurement...................................................................... 1H1
4-17. Skin Thickness ................................................................. 1 H3
InterimRevision:
10/15/97 1A5
Interim Revision: 10/15/97

Figure
4-18.
4-19.
4-20.
4-21.
4-22.
4-23.
4-24.
4-25.
4-26.
4-27.
4-28.
4-29.
4-30.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
5-22.
5-23.
5-24.
5-25.
5-26.
5-27.
5-28.
5-29.
5-30.
5-App-1.
5-App-2.
5-App-3.
5-App-4.
PIPERCHEYENNESERVICEMANUAL
LIST OF ILLUSTRATIONS(cont.)
Aerofiche
Grid No.
Typical Access Holes and Panels............................................................... 1H6
Fuselage Sealing (Forward)....................... ............................................. H8
Fuselage Sealing (Aft)................................................................................ H9
Faying Surface Seal .................................................................. 12
Joggle Seal ................................................................... 1H12
Holes and VoidsSeal ................................................................ IH13
Fillet Seal.............................................................................................. H13
Bolts and Rivets Seals................................................................. 14
Wire Harness Seals ......................................... ......................... H15
Floorboard Seals .......................................... .......................... H16
Fabricated Tools .......................................... ......................... H18
Door Snubber Assembly ........................................ ........................ H23
Erosion Shoe Installation
............................................................................. 117
Control Column Installation ......................................................................... 1115
Correct Method of Installing Rod End Bearings ................................................... 1118
Rigging Bobweight ................................................................................... 1119
Aileron and Aileron Trim Controls................................................................ 1123
Installation of Bellcrank Rigging Tool.............................................................. J3
Installation ofAileron Rigging Tool ................................................................ J3
Elevator and Elevator Trim Controls ............................................................... 1J5
Installation ofElevator Rigging Tool .............................................................. 10
Elevator Travel Stops
................................................................................. 10
Safety Wiring ...................................................................... 10
Methods of Blocking Trim Cables ................................................................ IJI
Rudder and Rudder Trim Controls .................................................................. J16
Installation of Rudder Rigging Tool
................................................................ 1J19
Installation of Rudder Trim Rigging Tool.......................................................... 1J19
Rudder Pedal Installation ........................................ ......................... J24
Clamping Rudder Pedals ............................................................................. KI
Rigging of Rudder Pedals ............................................................................ K
Trim Controls Installation............................................................................ K2
Trim Screw Assembly................................................................................ K4
Flap Controls (Piper System) ..................................................... . ............. K6
Flap Selector Switch (Piper System) ................................................................ K10
Flap System Diagram (Calco) ........................ ........................................ K12
Motor Assembly,Exploded View (Calco).......................................................... IK14
Flap Controls (Calco)
................................................................................. K17
Flap Rigging Adjustments (Calco) ................................................................. IK21
Amplifier-Electrical Schematic (Calco) ............................................................ IK23
Fabricated Aileron-Elevator RiggingTool
......................................................... IL2
Fabricated Bellcrank Rigging Tool................................................................. L3
Fabricated Rudder Rigging Tool .................................................................... L4
Fabricated Rudder Trim Tab Rigging Tool ......................................................... L5
Control Cable Inspection Technique............................................................... L19
Cable Wear Pattern ................................................................................... L20
Internal Cable Wear................................................................................... L20
Pulley Wear Patterns.................................................................................. L22
1A6 Interim Revision:10/15/97

PIPER CHEYENNE SERVICE MANUAL
LISTOFILLUSTRATIONS(cont.)
Aerofiche
Figure Grid No.
6-1. Schematic Diagram ofHydraulic SystemWith Gear Door Actuators........................... 2A16
6-1a. Schematic Diagram ofHydraulic SystemWithout Gear Door Actuators ...................... 2A17
6-2. Schematic ofPower Pack ElectricalSystem ...................................................... 2A18
6-3. Power Pack Installation .............................................................................. 2B2
6-4. Location of PowerPack Components (Ozone).............................. .................. 2B3
6-5. Hydraulic Power Pack (Ozone)...................................................................... 5
6-6. Power Pack Manifold (Ozone) ...................................................................... 2B9
6-7. Power Pack Handle-Release (Ozone) .............................................................. 2B13
6-8. Safetying Control Arms (Ozone) ................................................................... 2B13
6-9. Timing of Selector Spool (Ozone)...................................... 2...........................2B15
6-10. Handle-Release Adjustment (Ozone) ............................................................... 2B16
6-11. Location of PowerPack Components (WiebelTool) ............................................ 2B20
6-12. Hydraulic PowerPack (WiebelTool)............................................................... 2B21
6-13. Power Pack Manifold (WiebelTool)............................ ................................ 2B24
6-14. Power Pack Handle-Release Mechanism (WiebelTool) ........................... .. ......... 2C2
6-15. Safetying Control Arm (WiebelTool) .............................................................. 2C5
6-16. Indexing of Selector Spool (WiebelTool)......................................................... 2C6
6-17. Handle-Release Adjustment (WiebelTool)........... ............................ 2C8
6-18. Hydraulic System Schematic ........................................................................ 2C10
6-19. Hand Pump (Ozone).................................................................................. 2C13
6-20. Hand Pump (WiebelTool)........................................................................... 2C16
6-21. Nose Gear ActuatingCylinder (Ozone OAS 2923-3) ............................................. 2C18
6-22. Nose Gear orMain Actuating Cylinder (WiebelTool WTC 2115-1,
WTC 2235-1and WTC2236-1) .................. .............................. 2C20
6-23. Main Gear ActuatingCylinder (OzoneOAS 5107-1) ............................................. 2C23
6-24. Main Gear ActuatingCylinder (WiebelTool WTC 2145-1 and WTC 2145-3) ................. 2DI
6-25. Gear Door ActuatingCylinder (Ozone OAS 2924-3) ......... ................................ 2D2
6-26. Gear Door ActuatingCylinder (WiebelTool,WTC 2114-1)......... .................. 2D5
6-26a. Gear Door ActuatingCylinder (WiebelTool,WTC 2218-1) .................................... 2D8
6-27. Hydraulic Filter ......... 2D10.........
......... ................................... 2D
6-28. Hydraulic Pump....................................................................................... 2D11
6-29. Power Pack Test Harness Schematic ......... . .................. ......... ............ 2D15
7-1. Nose Gear OleoStrut Assembly..................................................................... 2E
7-1a. Installation ofT-Rings................................................................................ 2E4
7-2. Nose Landing Gear Installation...................................................................... 2E6
7-3. Clamping Rudder Pedals in Neutral Position....................................................... 2E14
7-4. Rudder Pedals Neutral Angle ........................................................................ 2E14
7-5. Aligning Nose Gear .................................................................................. 2E16
7-6. Nose Gear Steering Installation
............................ .................................... 2E19
7-7. Main Gear OleoStrut Assembly
................................................. ................ 2E22
7-8. Main Landing Gear Installation ..................................................................... 2E24
7-8a. Aligning Main Gear .................................................................................. 2F7
7-9. Inboard Main Gear Door Hinge ..................................................................... 2F9
7-9a. Test Equipment Installation, EmergencyGear Extension System ................................ 2F12
1A7
InterimRevision:10/15/97

PIPERCHEYENNESERVICE MANUAL
LIST OFILLUSTRATIONS(cont.)
Aerofiche
Figure Grid No.
7-9b. Fabricated Test Fitting, Emergency GearExtension System..................................... 2F13
7-9c. Landing Gear Actuating System (PA-31T2)
.................................................. 2F14
7-10. Adjusting Main Gear Down Limit Switch.................................................. 2F17
7-11. Gear Warning Switches Installation............ ................................................ 2F20
7-12. Nose Wheel Assembly (B.F.Goodrich 3-1331).................................................... 2F22
7-13. Nose Wheel Assembly (B.F.Goodrich 3-1076).................................................... 2F24
7-14. Main Wheel Assembly (Goodyear 9544171-1) .................................................... 2G2
7-15. Main Wheel Assembly (Cleveland40-106 and 40-106A) ......... ............................... 2G7
7-16. B.F. Goodrich Main Wheel Installation (3-1392 and 3-1424) .................................... 2G9
7-17. B.F. Goodrich Wheel Repair Limits (3-1392 and 3-1424) ........................................ 2G12
7-18. Wheel Brake Assembly (Goodyear 5002376)...................................................... 2G17
7-19. Rivet Head Grinding Limits (Goodyear 5002376)................................................. 2G19
7-20. Fabricated Rivet Tools(Goodyear 5002376)....................................................... 2G20
7-21. Snow Shield Modification (Goodyear 5002376)................................................... 2G21
7-22. Wear Pad-Wear Limits (Goodyear 5002376)....................................................... 2G22
7-23. Limits for Repadded Pressure and Back Plates (Goodyear5002376)............................ 2G22
7-24. Brake Disc Visual Check for ServiceableLimits (Goodyear5002376)......... .................2G24
7-25. Removal and Installation of Anchor Bolts......................................................... 2H6
7-26. Wheel Brake Assembly (Cleveland 30-106) ....................................................... 2H8
7-27. B.F. Goodrich 2-1435-2 Brake Installation......................................................... 2H10
7-27a. Brake Removal WearLimit ......................................................... 211
7-27b. Brake Removal WearLimit ....................................................... 2H11
7-28. Brake Master Cylinder Assembly ........................ .................................... 2H20
7-29. Parking Brake ValveAssembly......................... ..................................... 2H20
7-30. Fabricated Tool, Nose Gear Gauge Link Travel
.................................................... 2H21
7-31. Fabricated-Tool, MainGear Side-BraceLink Travel .............................................. 2H-22
7-32. Fabricated Tool, MainGear Toe-in Adjustment
.................................................... 2H23
7-33. Nose Gear Wear Limits .......................................................... ....... 214
7-34. Main Gear WearLimits .......................................................... ....... 217
8-1. Engine Cowling ................................................................. 2116
8-2. Engine Air Inlet IceProtection System ......................................................... 2120
8-2a. Air Inlet Ice Protection System (S/N 31T-8304001and up) ...................................... 212
8-2b. Special Equipment for Rigging Inertial SeparatorDoors
(S/N 31T-8304001 and up) .................................. ................ 2122
8-3. Oil Cooler Door Installation ..................................................................... 2123
8-4. Propeller Installation ..... ........................................... 22
8-5. Typical Nicks and Removal Method ............................................................... 2J3
8-6. Engine Installation (Typical)......................................................................... 2J9
8-7. Throttle Control Cable Handling Procedure........................................................ 2J13
8-8. Engine Controls ....................................................................................... 2J15
8-9. Low Pitch Stop Switch Adjustment............................................................... 2J22
8-10. Minor Torque Adjustment
............................................................................ 2K3
8-11. Running Adjustment Settings........................................................................ 2K6
Revised: 1/5/84 1A8

PIPER CHEYENNE SERVICE MANUAL
LISTOF ILLUSTRATIONS(cont.)
Aerofiche
Figure Grid No.
8-1
la. Fuel Nozzle Adapter Inspection ................. ............................................ 2K24
8-12. Fuel Manifold Test Rig.............................................................................. 2L2
8-13. Oil Filter Element............................................................................... 2L6
8-14. Torque SystemCalibration ................ 2................
........................ 9
8-15. Cheyenne IATorquemeter Test Setup .................... ......... ......... ......... 2L12
8-16. Cheyenne IATorquemeter TransducerTest Setup.......... .................................. 2L13
8-17. T5 Thermocouple Harness Loop Resistance Check ............................................... 2L15
8-18. T5 Harness InsulationResistance Check ........................................................... 2L15
8-19. Inter-TurbineTemperature CalibrationCheck.................................................... 2L16
8A-1. Engine Cowling ...................................................................................... 13
8A-2. Engine Air InletIce Protection System.......... ............................................. 3A15
8A-3. Oil Cooler Door Installation ............................................................... 3A16
8A-4. Propeller Installation ........... ....................................................... . . 3A19
8A-5. Typical Nicks and Removal Method .................................... .......................... 3A20
8A-6. Engine Installation(Typical)......... ........................... ............... 3B3
8A-7. Throttle ControlCable Handling Procedure......... ............. .................. 3B7
8A-8. Engine Controls......... ........................................................................... 3B10
8A-9. Low Pitch StopSwitch Adjustment ......... ...................................... 3B16
8A-10. Minor Torque Adjustment
............................. .......... B.......................21
8A-11. Running Adjustment Settings
........................................................................ 3B24
8A-1la. Fuel Nozzle Adapter Inspection ................................................ ................. 3C12
8A-12. Fuel Manifold Test Rig................................................................... 3C15
8A-13. Oil Filter Element
..................................................................... .. . 3C19
8A-14. Digital/Analog Torque Calibration.................................................................. 3C21
8A-15. T5 Thermocouple Harness Loop ResistanceCheck .................. ....................3C24
8A-16. T5 Harness Insulation ResistanceCheck ......... ................................................. 3C24
8A-17. Inter-Turbine TemperatureCalibrationCheck............. ........................ 3D
9-1. Fuel System Schematic (PA-31Tand PA-31T2) ................................................... 3D10
9-2. Fuel System Schematic (PA-31TI Only) ........................................ 3D12
9-3. Tip Tank Installation
................... ....................... ..... ....... ... 3D13
9-4. Fuel Cell Installation Inboard....................................................................... 3D15
9-4a. Fuel Cell AttachingHardware...................................................................... 3D16
9-5. Fuel Cell InstallationOutboard......... D..........
............................. 18
9-6. Fuel ValveDrainPlate............................ .......... ........................... 3D20
9-7. Crossfeed Valve
....................................................................................... 3E
9-8. Fuel ShutoffValve..................................................... ................ 3E4
9-9. Fuel Filter ........................................................................................... 3E6
9-10. SubmergedFuel Boost Pump ........................................................................ 3E8
9-11. Fuel System Installation...................................... 3E...............
.............. 3E
9-12. Fuel Cell TieDetail .................................................................................. 3E 2
9-13. Fabrication ofTest Fixture for TankUnit Testing .............................................. 3E17
9-14. Test EquipmentHookup.................................. ... ....... 3E18
9-15. Test Cables for Tank Unit Testing(For TF-20, Only) ............................................ 3E20
Interim
Revision:10/15/97 A9
Interim Revision: 10/15/97

PIPER CHEYENNE SERVICE MANUAL
LISTOFILLUSTRATIONS
(cont.)
Aerofiche
GridNo.
9-16. Alternate Indicator Bench TestHookup ............................................................ 3E20
9-16a. Fuel Gauge Adjustment ......... .................................................................. 3E21
9-17. Fuel VentSystem ......... ........................................................................ 3F1
10-1. Instrument Panel Installation (Typical) ............................................................. 3F7
10-2. Pitot-Static Installation ............................................................................... 3F8
10-3. Instrument Air System Installation ................................................................ 3F9
10-4. Turn and Bank VacuumSystem ..................................................................... 3F15
11-1. Switch and Circuit Breaker Panels ......... ................................................... 4A16
11-2. Exploded Viewof D.C. Starter-Generator ......................................................... 4A19
11-3. Correct Position ofBrushes and Springs......... ........................................... 4B1
11-4. Electrical Connections of Starter-Generator......... ...................... ................... 4B1
11-5. Paralleling Voltage Chart............................................................................. 4B2
11-5a. Position of Auxilec Tool for Blowing Out Carbon Dust From
Auxilec Starter-Generator ...................................................................... 4B8
11-6. Starter-Generator (Auxilec, Inc.) .................................................................... 4B 12
11-7. Brush Shunts Positioning ................................................................ 4B13
11-8. Dimension Check of Shaft Drive Sinking .......................................................... 4B14
11-9. Locating Washer ...................................................................................... 4B14
11-10. Locating Drive Shaft ................................................................................. 4B14
11-11. Brush Running in Diagram .......................................................................... 4B16
11-1la. Autostart Electrical Float Diagram .................................................................. 4B22
11-12. Cell Layout-Nickel Cadmium Battery ............................................................. 4C5
11-13. Patch Harness ......................................................................................... 4C8
11-14. Wiring Diagram Pre-Closed Loop Test ............................................................. 4C9
11-15. Wiring Diagram Automatic Line Contactor Test......... ..................................... 4C9
11-15a. Electro Delta Wiring Diagram ....................................................................... 4C 1
11-16. Wiring Diagram Test of Overvoltage Relay ........................................................ 4C15
11-17. Landing and Taxi Lights ............................................................................. 4C15
11-18. Wing Inspection Light................................................................................ 4C21
11-18a. Logo Light Assembly Adjustments ................................................................. 4D3
11-19. Door-Ajar Switch ..................................................................................... 4D4
11-20. Stability Augmentation System Layout Diagram.................................................. 4D13
11-21. S.A.S. Servo Motor ................................................................................... 4D17
11-22. S.A.S. Computer ...................................................................................... 4D19
11-23. S.A.S. Angle of Attack Vanewith Check EquipmentInstalled ................................... 4D22
11-24. S.A.S. Stall Warning Margin Indicator............................................................. 4D23
11-25. S.A.S. Stability Augmentator EmergencyOverrideSystem ...................................... 4E5
11-25a. A.O.A. Sensor Schematic ............................................................................ 4E9
11-26. Wing Flap Switch..................................................................................... 4E18
11-27. Safety Switch Function ............................................................................... 4E18
11-28. Basic Aircraft Electrical Bus Systems (Early Models)(Typical) ................................. 4E20
11-29. Basic Aircraft Electrical Bus Systems (PA-31TS/N 31T-8120001
and up and PA-31T1S/N 31T-8104001and up) (Typical).................................... 4E21
11-30. Basic Aircraft Electrical Bus Systems (PA-31T2S/N31T-8166001 and up)
(Typical) .......................................................................................... 4E22
1A10 Interim Revision:10/15/97

PIPER CHEYENNE SERVICE MANUAL
LIST OF ILLUSTRATIONS (cont.)
Figure Aerofiche
Grid No.
11-31. Component Location, Relay Shelf and Electrical Accessory Shelf
(Early Models).......................................................... 4E23
11-32. Component Location, Relay Shelf and Electrical Accessory Shelf
(PA-31T S/N 31T-8120001 and up and PA-31T1 S/N 31T-8104001 and up)..... 4E24
11-33. Component Location, Relay Shelf and Electrical Accessory Shelf
(PA-31T2 S/N 31T-8166001 and up) .... ..... .............................. . 4F1
11-34. Forward Electrical Panel Locations, Cheyenne IA ....................... ..... 4F2
NOTE
Electrical Schematic for PA-31T and PA-31TI .......... 7A5
Electrical Schematics for PA-31T2 ... ... ............... 8A5
Electronic Schematics for Section XII .................. 5A10
12-1. Battery Connections; Two Year- Magnesium ................................. 5A12
12-2. Pilot's Remote Switch and Emergency Locator Transmitter; Schematic ........... 5A13
12-3. Pilot's Remote Switch and Emergency Locator Transmitter; Schematic ........... 5A14
12-4. Emergency Locator Transmitter; Schematic (Narco) .......... ................ 5A16
12-5. ELT Portable Folding Antenna (Narco) ...................................... 5A17
12-6. ELT Using Fixed Aircraft Antenna (Narco) ................................... 5A17
12-7. Avionics Master and Emergency Switch Circuit ............... ................. 5A19
12-8. Avionics Antenna Locations ................................ ................ 5A22
13-1. Heating System Flow Diagram .. ...... ................. ..... .............. 5B6
13-2. Environmental Components ................................................. 5B7
13-3. Cutaway of Heater, Showing Whirling Flame (Typical) ......................... 5B9
13-4. Heater Cycling Switch ..... ................................................. 5B10
13-5. Combustion Air Blower and Motor Assembly (57D77) ......................... 5B16
13-6. Combustion Air Blower and Motor Assembly (89D23-1) ........................ 5B17
13-7. Combustion Air Blower and Motor Assembly (10E58-1, 10E58-2,
16E68-1 and 16E68-2) ................... ....... ......................... 5B20
13-8. Recirculation Fan and Motor Assembly (Dynamic Air) ......................... 5B21
13-9. Recirculation Fan and Motor Assembly (Dukes) ............................... 5C6
13-10. Spark Plug Fixture ........................................................ 5C9
13-11. Wiring - Test Setup ........................................................ 5C9
13-12. Ignition Unit Assembly (Typical) ..... ..... ................... .......... 5C9
13-13. Spark Plug (P/N 39D18) Gap Adjustment and Tool ........................... 5C10
13-14. Spark Plug(10E75-1 and 10E75-2). ........................................... 5CII
13-15. Fuel Pressure Relief Valve Bench Test ........................................ 5C16
13-16. Test Setup Fuel Regulator ............ ............................ ......... 5C17
13-17. Heater Assembly Exploded View (62D33) . .. ....... ........................... 5C20
13-18. Heater Assembly Exploded View (62D33-1 and 62D33-2) ...... ................. 5C21
13-19. Heater Assembly Exploded View (10E21-1) ................................... 5C23
13-20. Heater Assembly Exploded View (10E21-2) ............................................. .. 5D2
13-21. Seal Plate, Plugs and Caps for Combustion Tube Leak Test ..................... 5D5
Revised: 7/2/84 1A11

PIPER CHEYENNE SERVICE MANUAL
LIST OF ILLUSTRATIONS (cont.)
Figure Aerofiche
Grid No.
13-22. Test Setup - Combustion Air Pressure Switch ................................. 5D7
13-23. Suggested Setup for Heater Operation Test ................................... 5D10
13-24. Suggested Wiring Connections for Heater Operation Test ....................... 5D10
13-25. Auxiliary Heater and Switch ................................................ 5D18
13-26. Air Conditioning Flow Diagram ............................................. 5D24
13-27. Manifold Set Operation .................................................... 5E3
13-28. Charging and Evacuation Schematic (Charging Stand Method) .................. 5E6
13-29. Charging Stand, J-23500 ................................................... 5E7
13-30. Charging Schematic (Refrigerant Drum Method) .............................. 5E9
13-31. Compressor and Drive Assembly (Dual Belt) ......... .................... 5E10
13-32. Belt Inspection ............................................................ 5E11
13-33. Leak Test ................................................................. 5E12
13-33a. Positioning Sankyo Compressor Internal Parts (S/N 31T-8304001 and up)........ 5E15
13-34. Removing Driven Plate ..................................................... 5E16
13-35. Drive and Driven Plates .................................................... 5E16
13-36. Aligning Driven Plate Key .................................................. 5E17
13-37. Installing Driven Plate ..................................................... 5E17
13-38. Checking Air Gap ......................................................... 5E 17
13-39. Removing Pulley Retaining Ring ......... ................ ............... 5E17
13-40. Removing Pulley and Drive Plate ......... ... ..................... ...... 5E19
13-41. Removing Bearing......................................................... 5E19
13-42. Installing Pulley and Drive Plate Bearing ..................................... 5E19
13-43. Installing Pulley and Drive Plate ............................................ 5E19
13-44. Removing Coil Housing Retaining Ring ...................................... 5E20
13-44a. Magnetic Clutch Assembly (Sankyo Compressor) (S/N 31T-8304001 and up)...... 5E22
13-45. Drive Housing and Driver Assembly ......................................... 5E23
13-46. Fan and Condenser ........................................................ 5F3
13-47. Expansion Valve .......................................................... 5F6
13-48. Evaporator Control Valve ......... .................................... 5F6
13-49. Component Installation .................................................... 5F7
13-50. Installation of Seco 7 Seals ................................................. 5F10
13-51. Inspection Points (Air Conditioning System) .................................. 5F10
13-52. Pressurization System Schematic (Dukes) ..................................... 5F22
13-53. Cabin Pressure Test Units (Typical) .......................................... 5GI
13-54. Pressurization Test Hookup ......... ........................ ........... 5G2
13-55. Fabricated Hose Plug ...................................................... 5G4
13-56. Fabricated Reducer ........................................................ 5G4
13-57. Isobaric Valve ............................................................. 5G7
13-58. Safety Valve .............................................................. 5G7
13-59. Cleaning of Pressurization Controller (Typical) ................................ 5G14
13-60. Cabin Altitude Controller (Typical) .......................................... 5G18
13-61. Door Seal System ......................................................... 5G20
Revised:1/5/84 A
1A12

PIPER CHEYENNE SERVICE MANUAL
LIST OF ILLUSTRATIONS(cont.)
Aerofiche
Figure Grid No.
13-62. Controller Adjustment............................ ......... ........................... G21
13-63. Cabin Altitude Vs. Aircraft Altitude .................. ......... .........................5G22
13-64. Cabin Pressure Control System Schematic (Garrett) .............................................. 5H4
13-65. Pressurization System Schematic (Garrett)........................................................ 5H5
13-66. Safety or Isobaric ValveSchematic ............................................................... 5HI
13-67. Cabin Air Pressure OutflowValveController Schematic ......... ................................ 5H14
13A-1. Cabin Pressure Control System Schematic ......... .......................................... 6A11
13A-2. Cabin Pressurization (PA-31T2)
..................................................................... 6A12
13A-3. Safety and Outflow Valves............................ ........................................... 6A14
13A-4. Cabin Air Pressure Outflow ValveController..................................................... 6A15
13A-5. Fabricated Reducer Pressure Test Adapter ....................................... ......... .. .6A17
13A-6. Cabin Pressure Test Unit (Typical)................................................................. 6A17
13A-7. Pressurization Test Hookup......................................................................... 6A18
13A-8. Cabin Altitude Vs. Airplane Altitude ........... .................................... ...... 6A23
13A-8a. Door Seal System....................................................... 6B2
13A-9. Environmental Control System ........... ............................................ 6B9
13A-10. Cabin Pressurization and Bleed Air System Schematic ............. ......... ....................6B11
13A-11. ECS Test Harness Extension............................ ......................................... 6B19
13A-12. Cabin Comfort ........................................................................................ 6B20
14-1. Oxygen System Installation (PA-31Tand PA-31T1) ............................ .................. 6C7
14-2. Oxygen System Installation (PA-31T2)............................................................. 6C8
14-3. Propeller and Engine Air Inlet Lip Deicer System................................................. 6C15
14-4. Electrical Diagram ShowingCycle Sequence..................................................... 6C16
14-5. Electrical Diagram ShowingCycle Sequence...................................................... 6C16
14-6. Electrical Diagram ShowingCycle Sequence......... .......................................... 6C17
14-7. Electrical Diagram ShowingCycle Sequence............................. ...................... 6C17
14-8. Suggested Use of Dial Indicator............................ ................................... 6C21
14-9. Centering of Brushes on Slip Rings ......... .................................................. 6C22
14-10. Brush Block Assembly ............................................................... 6C23
14-11. Angle of Contact-Brushes to Slip Rings .................................................... 6C24
14-12. Brush Module Assembly (3E2011)................................................................. 6D
14-13. Alternate Module S tackingArrangement.......................................................... 6D1
14-14. Modular BrushAssembly (3E2044-1) ............................ ............................ 6D1
14-15. WiringDiagram, Propeller and EngineAir Inlet Lip Deicing System ........................... 6D3
14-16. Repair of Lead Strap.................................................................................. 6D5
14-17. Propeller DeicerInstallation ........................................ ....................... 6D6
14-18. Engine Air InletLip DeicerInstallation ............................ .. ......... .............6D7
14-19. Sealer Application ( Prop Boot) ..................................................................... 6D14
14-20. Sealer Application (Lead Strap) ............. .................................... ................ 6D14
14-21. Terminal Clamp Assembly........................................................................... 6D14
14-22. Wrinkled Deicers ................................................... ................................ 6D15
14-23. Propeller Blade in Feather Position ................................................... ............ 6D20
Revised: 7/2/84 1A13

PIPERCHEYENNESERVICEMANUAL
LIST
OFILLUSTRATIONS
(cont.)
Aerofiche
Figure Grid No.
14-24. Pneumatic Deicer System Installation .................. ............................. 6E6
14-25. Pneumatic Deicer Boots Operation.................................................................. 6E8
14-26. Pneumatic Deicer System Schematic ............................................................... 6E8
14-27. Marking and Cutting Scuff.................... ......... ...................... 6E15
14-28. Routing Scuff ......................................................................................... 6E15
14-29. Buffing Edge of Repair .............................................................................. 6E16
14-30. Hole Through Surface of Tube ......... ......... .......... ............. 6E16
14-31. Routing to Tube Fabric............................................................................... 6E17
14-32. Cutting Surface of Tube ......... ......... ... ............................ 6E17
14-33. Cementing Buffed Area and Patch .................................................................. 6E18
14-34. Applying and Stitching Fabric ......... .............................. ................... 6E18
14-35. Placing and Stitching Gum........................................................................... 6E19
14-36. Removing Trapped Air ............................................................................... 6E19
14-37. Masking Repair ........................... .. ......... ................................... 6E20
14-38. Applying Neoprene Putty .................. ......................................................6E20
14-39. Propeller Synchronizer Installation ........................ ........................................ 6F5
14-40. Propeller Synchronizer Schematic .................................................................. 6F8
14-41. Propeller Synchronizer Rigging (Left Engine Only).............................................. 6F10
14-42. Trimmer Assembly ......... ......... .. ...................................................... 6F11
14-43. Test Instrument T-46192 ............................................................................. 6F14
14-44. Propeller Synchrophaser Installation (Woodward
Type 1)........................................ 6F18
14-45. Propeller Synchrophaser Diagram (WoodwardType 1) .......................................... 6F22
14-46. Propeller Synchrophaser Rigging (Left Engine Only)................................. 6F24
14-47. Trimmer Assembly ................................................................................... 6G
14-48. 10Pin to 8 Pin Plug Adapters, P/N 5401-018 ...................................................... 6G4
14-49. Test Instrument, WT 46192 .......................................................................... 6G5
14-50. Propeller Synchrophaser Installation(WoodwardType 11)....................................... 6G9
14-51. Propeller Synchrophaser Diagram (WoodwardType 11)............................. ............ 6G13
14-52. Engine Fire Detectors ..................................... ................... 6G19
14-53. Engine Fire Control System ............................................... ..................... 6G21
14-54. Engine Fire Extinguisher ............................................................................. 6G22
14-APP-1.Determining Depth of Craze ......................................................................... 6H3
14-APP-2.
Visual Inspection............................ .......................................... 6H6
14-APP-3.
Crack Limitations ..................................................................................... 6H7
1A14 Interim
Revision:
10/15/97

PIPER CHEYENNE SERVICE MANUAL
LIST OF TABLES
Table Aerofiche
Grid No.
11-1. Leading Particulars and Principal Dimensions ................................ 1B12
11-11. Recommended Nut Torques (Inch-Pounds) ................................. IB15
11-111. Flare Fitting Torque Chart ............................................... 1B18
II-IV. Thread Lubricants ............... ........................................ IC12
Il-V. Oxygen Servicing Table for 22, 48, and 50 Cubic Foot Cylinders .............. IDI
Il-VI. Decimal Conversion Chart ................................................ ID8
Il-VII. Consumable Materials ................................................... ID12
II-VIII. List of Vendor Publications .................. ............................ ID22
Ill-1. Ball Diameters for Testing Hose Restrictions ................................ 1E11
II-II. Hose Specifications ...................................................... IE12
IV-I. Control Surface Balancing (PA-31T) ....................................... 1G15
IV-II. Control Surface Balancing (PA-31TI) (With Tip Tanks) ...................... 1G16
IV-III. Control Surface Balancing (PA-31TI) (Without Tip Tanks) ................... IG17
IV-IV. Control Surface Balancing (PA-31T2) ...................................... IG18
IV-V. Paint Materials ......................................................... IH22
V-1. Control Surface Travel and Cable Tension .................................. 1112
V-11. Elevator Trim Drum and Cable Specifications ............................... 1114
V-111. Troubleshooting Chart (Surface Controls) .................................. 1L7
VI-1. Leading Particulars, Hydraulic Power Pack (Ozone) ......................... 2A20
VI-11. Leading Particulars, Hydraulic Power Pack (Wiebel Tool) .................... 2A21
VI-1ll. Inspection and Repair, Hydraulic Pump .................................... 2D12
VI-IV. Troubleshooting, Hydraulic System ........................................ 2D16
VII-1. Inspection Limits (Goodyear 9544171-4) ......... ........................... 2G5
VII-11. Inspection Limits (Goodyear 5002376)..................................... 2H1
VII-111. Brake Wear Limits (B.F. Goodrich, 2-1435-2) ............................... 2H15
VII-IV. Troubleshooting Chart (Brakes) (B.F. Goodrich 2-1435-2) .................... 2H 17
VII-V. Troubleshooting Chart (Landing Gear System) .............................. 2H24
VIII-l. Propeller Specifications .................................................. 2J4
VIII-11. List of Vendor Publications ............................................... 2J4
VIII-111. Troubleshooting Chart (Fuel Scavenger System) ............................. 2L1
VIII-IV. Torque System Calibration Data .......................................... 2L9
VIII-V. Cheyenne IA Torquemeter Calibration Data ................................ 2L12
VIII-VI. Cheyenne IA Torquemeter Transducer Pressure Test Specifications ............ 2L13
VIII-VII. Troubleshooting Chart (Engine) ..................... ...................... 2L18
VIIIA-1. Propeller Specifications .................................................. 3A21
VIIIA-11. List of Vendor Publications ............................................... 3A21
VIIIA-III. Troubleshooting Chart (Fuel Scavenger System) ............................. 3C14
VIIIA-IV. Digital/Analog Torque Calibration Data ................................... 3C22
VIIIA-V. Troubleshooting Chart (Engine) ........................................... 3D3
IX-1. Test Equipment .......... ... .................. ................ ....... 3E16
IX-11. Scale Error Reading .................. ... .: ................. 3E20
IX-III. Tank Unit Capacitance (Dry) ............................................. 3E20
IX-IV. Troubleshooting Chart (Fuel Gauging System) .............................. 3E22
IX-V. Troubleshooting Chart (Fuel System) ...................................... 3E23
Revised: 7/2/84 1A15
IA15

PIPER CHEYENNE SERVICE MANUAL
LIST OF TABLES (cont.)
Table Aerofiche
Grid No.
X-I.
X-II`.
X-III.
X-IV.
X-V.
X-VI.
X-VII.
X-VIII.
X-IX.
X-X.
X-XI.
X-XII.
X-XIII.
X-XIV.
X-XV.
X-XVI.
X-XVII.
X-XVIII.
X-XIX.
X-XX.
X-XXI.
XI-I.
XI-la.
XI-lb.
XI-II.
XI-III.
XI-IV.
XI-V.
XI-VI.
XI-VII.
XI-II.
XIII-I.
XIII-II.
XII-III.
XIII-IV.
XIII-V.
XIII-VI.
XIII-VII.
XIII-VIII.
XIII-IX.
XIII-X.
XIII-XI.
Pitot-Static System ......................................................
Airspeed Indicator.......................................................
Altimeter ...............................................................
Rate of Climb Indicator ..................................................
Magnetic Compass ......................................................
Pneumatic System Pressure Gauge .........................................
Engine Oil Pressure Gauge (Wet Direct Reading and Electric) .................
Fuel Pressure Gauge (Wet Direct Reading and Electric) ......................
Attitude Gyro (Electric)..................................................
Directional Gyro (Electric) ................................................
Turn and Bank Indicator ................................................
Air Temperature Gauge ..................................................
Voltmeter ..............................................................
Fuel Quantity Gauge.....................................................
Fuel Flow Gauge........................................................
Oil Temperature Gauge ..................................................
Engine Torque Gauge ....................................................
Inter-Turbine Temperature Gauge .........................................
Tachometer (Propeller) ...................................................
Engine Hour Recorder ...................................................
Annunciator Display.....................................................
New Lightweight Wire Vs. Old Wire .......................................
Wire Resistance U.S. Length..............................................
Starter-Generator Test Specifications (Lear-Siegler) ..........................
Inspection of Components ................................................
Starter-Generator Test Specifications .......................................
Troubleshooting Chart (Starter-Generator)..................................
Troubleshooting Chart (Electrical System) ..................................
Circuit Load Chart ......................................................
Lamp Replacement Guide ................................................
Index - Electronic Installation Schematics and Harness .......................
Leading Particulars (Axial Flow Fan) (Dynamic Air) ........................
Troubleshooting Chart (Recirculating Fan) (Dynamic Air) ....................
Inspection ..............................................................
Troubleshooting Chart (Heating)..........................................
Troubleshooting Chart (Auxiliary Heater) ..................................
Temperature Pressure Chart (Standing System) .............................
Aluminum Tubing Torque ...............................................
Vacuum Vs. Temperature .................................................
Compressor Belt Tension .................................................
Troubleshooting Chart (Air Conditioning) ..................................
Cabin Differential Pressure Switch Specifications ............................
4 1A16
3F20
3F21
3F22
3F23
3F24
3G1
3GI
3G2
3G2
3G3
3G4
3G5
3G5
3G5
3G6
3G6
3G7
3G8
3G8
3G9
3G9
4A13
4A16
4A21
4A22
4B5
4B12
4E10
4E14
4E17
5A10
5C1
5C2
5C14
5D14
5D20
5E1
5E2
5E6
5E13
5F11
5F21
Revised: 7/2/84

PIPERCHEYENNE
SERVICE
MANUAL
LIST OF TABLES(cont.)
Table Aerofiche
Grid No.
XIII-XIA.
XIII-XII.
XIIIA-I.
XIIIA-IA.
XIIIA-II.
XIV-I.
XIV-II.
XIV-III.
XIV-IV.
XIV-V.
XIV-VA.
XIV-VB.
XIV-VI.
XIV-VII.
XIV-VIII.
XIV-IX.
XIV-X.
XIV-XI.
XIV-XII.
XIV-XIII.
XIV-XIV.
XIV-XV.
XIV-XVI.
XIV-XVII.
XIV-XVIII.
XIV-XIX.
XIV-XX.
XIV-XXI.
XIV-XXII.
XIV-XXIII.
XV-I.
XV-II.
XVA-I.
XVA-II.
Troubleshooting Chart (Pressurization System) (DUKES) ........... ......
Troubleshooting Chart (Pressurization System) (GARRETT) .................
Cabin Differential Pressure Switch Specifications ...........................
Troubleshooting (PA-31T2 Pressurization System) ...........................
Troubleshooting (PA-31T2 Environmental Control System) ...................
Oxygen System Components Limits ...................... .................
Troubleshooting Chart (Oxygen System) ...................................
Power Requirement for 28 VDC System ......... ..........................
Required Materials for Repair of Deicers ..................................
Electrical Resistance .....................................................
Electrical Resistance - Lip Deicer (S/N 31T-8304001 and up)..................
Lip Deicer - Temperature/Sensor Check. ..... ............ ..................
Troubleshooting Chart (Engine Deicer System) ..............................
Operating Pressures . ......... ........ .... ...... ........................
Materials and Supplies for Cold Repairs ...................................
Materials for Vulcanized Repairs ..... ...... ...............................
Equipment and Tools for Vulcanized Repairs ...... .........................
Troubleshooting Pneumatic Deicer System .................................
Synchronizer Wiring Test.................................................
Aircraft Wiring Check with Actuator Removed ....... ......................
Troubleshooting Chart (Actuator) ................ .........................
Troubleshooting Chart (Propeller Synchronizer) .............................
Synchrophaser Wiring Test (Woodward Type I) .. ...........................
Bench Testing the Actuator ......... .......... ............................
Troubleshooting Chart (Actuator) .........................................
Troubleshooting Chart (Propeller Synchrophaser) (Woodward
Type I)...............................................................
Synchrophaser Wiring Test (Woodward Type II) ............................
Magnetic Pickup Voltage Output Test... .... .. .... .........................
Troubleshooting Chart (Propeller Synchrophaser) (Woodward
Type II) ..............................................................
Pressure Temperature Correction ................ ........................
Electrical Wire Coding .................................................
Electrical Symbols ... .................. .............. ..................
Electrical Wire Coding ................ ......... ....... ...................
Electrical Symbols .. ................ ...................................
5G23
5H15
6A21
6B3
6B16
6C9
6C11
6D3
6D9
6D16
6D16
6D17
6D22
6E7
6E10
6E12
6E14
6F2
6F6
6F12
6F13
6F15
6F19
6G3
6G4
6G6
6G11
6G12
6G17
6G22
7A13
7A14
8A6
8A7
Revised: 7/2/84 1A17

PIPER CHEYENNE SERVICE MANUAL
LIST OF CHARTS
Chart
2-1.
2-2.
2-3.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
8-11.
8-12.
8A-1.
8A-2.
8A-3.
8A-4.
8A-5.
8A-6.
9-1.
11-1.
Aerofiche
Grid No.
Lubrication Chart (Landing Gears) .......................................
Lubrication Chart (Control System)............ ....... ................
Lubrication Chart (Power Plant and Accessories) ..............................
Ground Adjustment Check Sheet (PA-31T) ...................................
Ground Adjustment Check Sheet (PA-31T1) ..................................
2000 RPM Torque Curve ......... ......... .................................
Fuel Flow (PA-31T) .......................................................
Gas Generator Speed/Data Plate Speed (PA-31T) .............................
Inter-Turbine Temperature (PA-31T) .........................................
Torque (PA-31T) ..........................................................
Data Plate Speed Ratio Curve (PA-31T) .....................................
Fuel Flow (PA-31TI) ......................................................
Gas Generator Speed.......................................................
Inter-Turbine Temperature (PA-31TI) ........................................
Torque (PA-31TI) .........................................................
Ground Adjustment Check Sheet ............................................
Fuel Flow (PA-31T2) ......................................................
Gas Generator Speed (PA-31T2)..............................................
Torque (PA-31T2) .........................................................
Inter-Turbine Temperature (PA-31T2) ........................................
1700 RPM Torque Setting (PA-31T2) ........................................
Fuel Cell Repair Equipment Lists............................................
S.A.S. Angle Relationships .................................................
IC15
1C17
IC19
2K11
2K12
2K13
2K14
2K15
2K16
2K17
2K18
2K19
2K19
2K20
2K20
3C4
3C5
3C5
3C5
3C6
3C7
3D24
4E8
Revised:7/2/84 1A18

SECTION
I
INTRODUCTION
Paragraph Aerofiche
GridNo.
1-1.
1-2.
1-3.
1-4.
1-5.
1-6.
1-7.
1-8.
1-9.
1-10.
1-11.
1-12.
1-13.
1-14.
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Flight Controls ...........
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LandingGear ............
Engines ...............
Propellers ..............
Fuel System ............
EnvironmentalControlSystem
Instruments .............
ElectronicEquipment .......
Pressurization
System .......
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Revised:1/5/84
1A19

PIPER CHEYENNE SERVICE MANUAL
SECTION I
INTRODUCTION
1-1. GENERAL. This manual contains service and maintenance instructions for the Piper Cheyenne.
designed and manufactured as a versatile aircraft in the personal and business aviation field by the Piper
Aircraft Corporation, Lock Haven. Pennsylvania.
1-2. SCOPE OF MANUAL. Sections II and III comprise the service part of this manual, Sections IV
through XIV comprise the maintenance instructions and Section XV comprise the electrical schematics. The
service instructions include ground handling, servicing and inspection. The maintenance instructions for
each system include troubleshooting. removal and installation of components, and corrective maintenance
and testing each major system of the airplane is covered in a separate section, and ample illustrations to
supplement the text are located as closely as possible to the related instructions. Only qualified personnel
should perform the operations described in this manual.
1-3. DESCRIPTION. The Piper Cheyenne is a six to ten place pressurized, twin-engine turboprop,
low-wing monoplane of all metal construction. The following paragraphs provide descriptions of the major
components and systems.
1-4. FUSELAGE. The fuselage is a semi-monocoque structure that consists of three basic units: The nose
section, the pressurized cabin section and the tail cone section.
1-5. WING. The laminar flow wing is of all metal stressed skin, full cantilever design, consisting of two
wing panels bolted together at the center of the fuselage. Wing tip tanks may be installed, depending on the
installation. The ailerons are cable and push rod controlled and are statically and dynamically balanced. The
trailing edge wing flaps are electrically operated.
1-6. EMPENNAGE. The empennage consists of the vertical stabilizer (fin), rudder with a servo trim tab,
horizontal stabilizer, and elevator with tabs. The control surfaces are cable controlled and are dynamically
and statically balanced.
1-7. FLIGHT CONTROLS. The flight controls are conventional, consisting of dual control wheels that
operate the ailerons and elevator, and dual foot pedals that operate the rudder. The trim tabs for each control
are operated by wheels or knobs located in the control pedestal along with the position indicators for each tab.
1-8. HYDRAULIC SYSTEM. Two separate hydraulic systems are incorporated in the airplane. The main
system is the hydraulic power pack that operates the landing gear and inboard main gear door actuating
cylinders. The second system operates the airplane's brake system.
1-9. LANDING GEAR. The tricycle landing gear system is hydraulically operated and fully retractable with
doors that completely cover the gear when retracted. The gear struts are air-oil type units. The PA-31T2 is
equipped with an independent emergency gear extension system, other than the hand pump.
1-10. ENGINES. The Piper Cheyenne ispowered by two Pratt and Whitney PT6A turboprop engines, which
are reverse flow, free-turbine engines. (Refer to Section 11,Table 11-1for Leading Particulars.)
Revised: 1/5/84 lA20 INTRODUCTION