Piper Aircraft Corporation TWIN COMANCHE PA-39 User manual

AIRPLANE SERVICE MANUAL
CARD 1 OF 4
TWIN COMANCHE
PIPERAIRCRAFT CORPORATION
PART NUMBER 753 645
REVISED: OCT. 1,1998
1Al
Courtesy of Bomar Flying Service
www.bomar.biz

Published by
Technical Publications
O The New Piper Aircraft, Inc.
2926 Piper Drive
Vero Beach,
Florida 32960
U.S.A.
- -
-
- -
-
.- 2 +- Member
-
- E3 =a GeneralAviation
--
- -
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Manufacturers Association

PIPER TWIN COMANCHESERVICEMANUAL
AEROFICHE REVISION STATUS
Revisions to this service manual 753 645, originally published (on paper only) August 1, 1963 and
reissued (on paper only) December 29, 1972are
as follows:
Revisions Publication Date Aerofiche Card Effectivity
ORIGINAL (Paper only) August 1. 1963 None
COMPLETE REISSUE (Paper only) June 25, 1969 None
COMPLETE REISSUE (Paper only) December 29. 1972 None
1st January 31, 1974 None
2nd June 28. 1976 1.2and3
3rd October
6. 1977 land2
4th April 26, 1978 1.2and3
5th September 10. 1979 1and 2
6th April
6, 1981 1.2.3and4
7th October 28. 1982 1. 2. 3 and 4
8th* October 1. 1998 1, 2, 3, and 4
* Revisions appear in all four cards. Accordingly,
discard your existing card set and replace it with
these cards dated October
1,1998.
A. Consult the latest Piper Customer Service Information Catalog No. 1753-755 (Aerofiche) for
current revision dates for this manual.
B.
The General Aviation Manufacturers Association (GAMA) has developed specifications for
microfiche reproduction of aircraft publications. The information compiled in this Aerofiche
Service Manual will be kept current by revisions distributed periodically. These revisions will
supersede all previous revisions and will be complete Aerofiche card replacements and shall
supersede Aerofiche cards of the same number in the set.
C. Conversion of Aerofiche alphalnumeric grid code numbers:
First number is the Aerofiche card number.
Letter is the horizontal row reference per card
Second number is the vertical column reference per card.
Example:
2J 16 = Aerofiche card number two, row J, column 16.
D. To aid in locating information, a complete Preface containing the Section Index Guide, List of
illustrations and List of Tables for all fiche in this set is provided at the beginning of Card 1.Each
subsequent aerofiche card contains a partial Preface, displaying only those elements on that card.
IDENTIFYING REVISED MATERIAL
A revision to a page is defined as any change to the text or illustrations that existed previously. Such
revisions, additions and deletions are identified by a vertical black line (change bar) along the left-
hand margin of the page opposite only the text or illustration that was changed.
\
Changes in capitalization, spelling, punctuation, indexing, the physical location of the material or
complete page additions are not identified by revision lines.
\
Example
Revised: 1011198
PREFACE

PIPER TWIN COMANCHESERVICE MANUAL
EFFECTIVITY
This service manual is effective for all PA-30 and PA-39 airplanes as follows:
b3Qddbm M&!whlh Serial Numbers Model Yeag
Twin Comanche
PA-30 30-2 thm 30-901. less 30-853 1963 - 1965
Twin Comanche B and PA-30 30-853 and 30-902 thm 30-1744. 1966 - 1968
Twin Comanche Turbo B less 3C-1717
Twin Comanche C and PA-30 30-1717 and 30-1745 thru 30-2000 1968 - 1970
Twin ComancheTbrbo C
nin Comanche C/R and PA-39
Twin Comanche Turbo C/R
PARTS
This manual generally does not contain hardware callouts for installation. Hardware callouts are only
indicated where a special application is required. To confirm the correct hardware used. refer to the
PA-
30139 nin Comanche Part. Catalog P/N 753 646. and FAR 43 for proper utilization.
WARNINGS, CAUTIONS AND NOTES
These are used to highlight oremphasize important information.
- WARNING -
OPERATING PROCEDURES, PRACTICES, ETC., WHICHMAY RESULT IN
PERSONAL INJURY OR LOSS OF LIFE IF NOT CAREFULLY
FOLLOWED.
- CAUTION -
OPERATING PROCEDURES, PRACTICES, ETC., WHICH IF NOT
STRICTLY OBSERVED MAY RESULT IN DAMAGE TOEQUIPMENT.
- Note -
An operating procedure, condition, etc.. which is essential to emphasize
PREFACE
Added: 10IU98

PIPER TWIN COMANCHESERVICE MANUAL
I SECTIONINDEX GUIDE
SECTION SUBJECT
I PART I - Information Common to PA-30 and PA-39
I INTRODUCTION
I1 HANDLING AND SERVICING
111 INSPECTION
IV STRUCTURES
V SURFACECONTROLS
VI NOT USED
APPENDIX
I
CONTROL CABLE INSPECTION PROCEDURE
VII LANDING GEAR AND
BRAKE SYSTEM
VlII POWER PLANT (NORMALLY ASPIRATED)
VIIIA POWER PLANT (TURBOCHARGED)
IX FUEL SYSTEM
X INSTRUMENTS
XI ELECTRICAL SYSTEM
XI1 ELECTRONICS
XI11 HEATING AND VENTILATING SYSTEM
XIV ACCESSORIES AND UTILITIES
PART
U - Information Unique to PA-39
1 INTRODUCTION
I1 HANDLING AND SERVICING
IV STRUCTURES
V SURFACECONTROLS
VIlI POWER PLANT (NORMALLY ASPIRATED)
VIIIA POWER PLANT(TURBOCHARGED)
X INSTRUMENTS
XI ELECTRICAL SYSTEM
XI1 ELECTRONICS
Revised: 10/1/98
AEROFICHE CARD NO. 1
1A15
1A19
1d15
1E5
1G7
IKI
AEROFICHE CARD NO. 2
2A9
2D18
2G1
2121
2K14
AEROFICHE CARD NO. 3
3A9
3G12
AEROFICHE CARD NO. 4
4A7
4E7
4G5
4G9
4G16
4G19
4H5
4Hl l
4H17
4H19
411
PREFACE

PIPER TWIN COMANCHE SERVICE MANUAL
LISTOFILLUSTRATIONS . PART I
i%ardsa s&!Ja
Three View of Twin Comanche. SerialNos.30-1 to 30-852 incl . and
30-854to 30-901 incl...................................................................................................
Three View of lbinComanche. SerialNos . 30-853. to 30-2000 incl .............................
Station ReferenceLines . Fuselage ...................................................................................
StationReference Lines, Wing and Stabilator ..................................................................
Access Platesand Panels. FuselageInterior .....................................................................
Access Plates and Panels . Fuselage . Serial Nos.30-1
...........................
to 30-852 incl .. and 30-854 to 30-901 incl .......
.............................
Access Plates and Panels. Fuselage,SerialNos.30-853 . 30-902
to 30-2000 incl
........................... ... ............................................................................
Access Plates and Panels. W~ngs ......................................................................................
Torque Wrench Formula ............................ .. ...................................................................
Jacking Arrangements ......................... .. .......................................................................
WeighingAirplane ............................................................................................................
Leveling Airplane. Serial Nos.30-1 to 30-852incl . and
30-854 to 30-901 incl
................ .. .............................................................................
Leveling Airplane, Serial Nos . 30-853. 30-902 to 30-2000incl ..............................
MinimumTurningRadius ................... .. ..... .. ...............................................................
. .
Servlc~ngLanding Gear Struts ........................................................................................
ServicePoints . Serial Nos . 30-1 to 30-852 incl.and 30-854 to 30-901 incl....................
ServicePoints. Serial Nos.30-853 . 30-902to 30-2000 incl...........................................
Oil Suction Screen ............................................................................................................
...........................................................................................................
Oil Pressure Screen
Turbo Oil Filter
.................................................................................................................
. .
Lubrication Chart ..............................................................................................................
. .
Identification of Aircraft Flu~dLines ..............................................................................
Removal of Cherrylock Rivets ......................................................................................
Landing Light Installation.............................................................................................
Aileron and Flap Installation ............................................................................................
Wing Installation............................................................................................................
Empennage Installation ..................................................................................................
Windshield Installation .....................................................................................................
Side Window Installation(Typical)..................................................................................
Door Installation ...............................................................................................................
Door Locking Mechanism ................................................................................................
Skin Material and Thickness..........................................................................................
......................................................................................................
Typical Access Holes
CheckingStabilatorFree Play ........................................................................................
Balancing Stabilator. Serial Nos.30-1 to 30-852 incl.. 30-854 to
.............................................................
30-901 incl .. 30-1717. 30-1745 to 30-2000incl
Balancing Stabilator
. Serial Nos.30-853 . 30-902to 30-1716incl .
and 30-1718 to 30-1744 incl.................. .. .....................................................................
Checkingand Balancing Rudder ........................................................................................
..................................................................
SurfaceScratches . Abrasion or Ground-in-Dirt ...............................................................
Deep Scratches. Shallow Nicks and Small Holes
PREFACE Revised: 10/l/98

PIPER TWIN COMANCHE SERVICE MANUAL
LIST OF LLLUSTRATIONS . PART I (cont.)
s&ia
5.17 .
5.18 .
5.19 .
APP 1.1 .
APP 1.2 .
APP 1.3 .
APP 1.4 .
7.1 .
7.2 .
7.3 .
7.4 .
7.4a .
7.5 .
7.6 .
7.7 .
7.8 .
7.8a .
7.8b .
7.8~ .
7.9 .
7.10 .
Mixing of Epoxy Patching Compound ..............................................................................
......................................................................................................
Welding Repair Method
. .
Repanng of Cracks ............................................................................................................
Various Repairs ...................................................................................................................
.....................................................................................................
Repair of Stress Lines
.............................................................................................
Repair of Impacted Damage
Control Column Installation
...............................................................................................
...........................................................
Correct Method of Installing Rod End Bearings
Aileron Control Installation
................................................................................................
Installation of Bellcrank Checking Tool ..
. .
...................................................................................
Installation of Aileron R~ggmgTool
Stabilaror and StabilatorTrim Controls
Stabilator Rigging Tool
.......................................................................................................
......................................................................................
Methods of Blocking Trim Cables
............................ ................................................................
Rudder Pedal Installation ...
.................................................................................................
Adjustment of Brake Pedal
Rudder and Rudder Trim Controls
......................................................................................
...................................................................
Clamping Rudder Pedals in Neutral Position
..........................................................................
Determining Neutral Rudder Position
...................................................................................................
Checking Rudder Travel
Trim Screw Assembly
Flap Control Installati
..................................
...................
Flap Position Sender Unit
Fabricated Aileron Be
. .
Fabricated Aileron R~ggmgTool ....................................................................................
................
Fabricated StabilatorRigging Tool
Control Cable Inspection Technique
...................................................................................
....... ................
External Cable Wear Patterns ..
lntemal Cable Wear
Pulley Wear Patterns
...........................................................................................................
Nose Gear Oleo Stmt Assembly
.......................................
Nose Landing Gear Installat ..........................................
Clamping Rudder Pedals in
.....
Rudder Pedals at Neutral Angle
.........................................................
Rudder Pedals at Neutral Position SIN 39-84 and up
.....................................................................
Installation of Plumb Bob Attachment Tool
.............................................................................
Installation of Nose Gear Alignment Jig
Nose Gear Door Installation
......................
.........................................................................................
Main Gear Oleo Strut Assembly
...
Main Gear Side Brace Link Travel
............
Main Gear Side Brace Bearing Tolerance
............... ...... Main Gear Side Brace Link Tolerance ...
.........
Main Landing Gear Installation (Left)
Adiustment of Main Landing Gear Drag Link
Grid No
.
.
...............................
.
7-1 1 Aligning Main Gear
.
Revised: 1011198
PREFACE

PIPER TWIN COMANCHESERVICE MANUAL
LIST OF ILLUSTRATIONS . PART I (cont.)
Landing Gear Retraction System ........................................................................................
.............................................................
Landing Gear Retraction Transmission Assembly
Landing Gear Retraction Transmission Installation .........................................................
...........................................................................................
Landing Gear Up Limit Switch
Torque Wrench and Adapter Installation ............................................................................
................................................................................
Landing Gear Down Lock Installation
Landing Gear Warning Switch Installation
.......................................................................
Nose Wheel Assembly ........................................................................................................
Main Wheel Assembly . Serial Nos . 30-2 to 30-845 incl ............................. ........... ............
Main Wheel Assembly . Serial Nos . 30-846 to 30-2000 incl ...........................................
Wheel Brake Assembly .......................................................................................................
...................................................................... Removal and Installation of Anchor Bolt
............................................................................................ Removal of Wheel Brake Disc
Brake SystemInstallation
................................................................................................
Brake Master Cylinder Assembly .......................................................................................
Bleeding Brakes ..................................................................................................................
Brake Cylinder Installation .............................................................................................
Fabricated Plumb Bob Tool ................................................................................................
.............................................................................
Fabricated Nose Wheel Alignment Jig
Fabricated SpannerWrench
................................................................................................
Inspection of Rod End Bearings .........................................................................................
. .
Main Gear Wear Llmts .................... .... ........................................................................
. .
Nose Gear Wear Llmts .......................................................................................................
............................................................................
Engine Cowling and Cowl Flap Rigging
Standard Propeller Installation
............................................................................................
.................................................................................
Typical Nicks and Removal Methods
..............................................................................................................
Propeller Governor
Engine Installation
..............................................................................................................
............................................................
Schematic Diagram of RSA Fuel Injector System
Fuel Injector
.......................................................................................................................
Fuel Air Bleed Nozzle .........................................................................................................
Magneto Breaker Points ......................................................................................................
Contact Spring Inspection ........................... .... ..............................................................
Impulse Coupling ................................................................................................................
.............. .....................................................................................
Magneto T~mingMarks ..
.......................................................................................................
Engine 'liming Marks
..........................................................................
Removing Spring From Lead Assembly
Assembly Tool
..................................................................................................................
Using Assembly Tool ..........................................................................................................
Measuring Lead Assembly Length ....................................................................................
...........................................................................
Cutting Metallic Braid from End of Lead
. . . .
UnbrrudlngMetallic Shleldlng .............. .. ........................................................................
. .
Forming Shleldlng Around Fermle .....................................................................................
FemleSeating Tool ............................................................................................................
.......................................................................................................................
Needle
PREFACE
Revised: 10llf98

PIPER TWIN COMANCHE SERVICE MANUAL
LIST OF ILLUSTRATIONS . PART I (cont.)
F- ml%a
.................................................................................
Measuring Wire From Top of Ferrule
Installing Grommet Over Lead Assemblies
........................................................................
Lead Assembly Installed in Grommet ................................................................................
....................................................................
Wire Doubled Over For Installation of Eyelet
............................................................................................
Removing Frozen Spark Plug
............................................................................
Engine Cowling and Cowl Flap Rigging
...........................................................................................................
Propeller Installation
............................................
................................
vpicalNicks and Removal Methods
..
................ .......................................................................................
Propeller Governor ..
...........................................................................................................
Engine Installation
................................................
.................
Schematic Diagram of Turbocharged System
..
. .
...........................................................................................
Lockw~nngV-Band Couplings
....... .................................
Schematic Diagram of RSA Fuel Injector System ............. ..
..
Fuel Injector .......................................................................................................................
........................................................................................................
Fuel Air Bleed Nozzle
......................................................................................................
Magneto Breaker Points
...................................................................................................
Contact SpringInspection
................................................................................... ....................
Impulse Coupling ..
. .
.....................................................................................................
Magneto T~mgMarks
Engine Tuning Marks
.....................................................................................................
Removing SpringFrom Lead Assembly .............................................................................
Assembly Tool ..................................... ... ............................................................................
Using Assembly Tool ..........................................................................................................
.....................................................
.......................
Measuring Lead Assembly Length ..
................................................
......................
CuttingMetallic Braid From End of Lead
..
. . . . ............................................................................................
Unbrad~ngMetallic Sh~eldlng
. . .....................................................................................
Forming Sh~eldingAround Ferrule
Ferrule Seating Tool
........................ ...... .........................................................................
.......................................................................................................................
Needle
Measuring Wire From Top of Ferrule
...............................................................................
Installing Grommet Over Lead Assemblies .....................................................................
Lead Assembly Installed in Grommet ..............................................................................
........................ ..................................
Wire Doubled Over for Installation of Eyelet
....
...........................................................................................
Removing Frozen Spark Plug
.......................................................................................................
TurboOil Flow Check
..................................................
....................................
Fuel System Schematic (PA-30) ...
Fuel System Schematic (PA-30 Turbo) ...............................................................................
Fuel Cell Installation (Mainanboard) ...............................................................................
Fuel Cell Installation (AuxiliarytOutboard) ........................................................................
........................................................................... .......................
Checking Sender Unit ...
..........................................................................................................
Checking Fuel Gauge
Fuel Indicating System Wlng Schematic
............................................................................
Fuel System Installation ......................................................................................................
Fuel System Installation (Turbo) ........................................................................................
Fuel StrainerAssembly .......................................................................................................
Revised: 1011198 PREFACE

PIPER TWIN COMANCHESERVICE MANUAL
LIST OF ILLUSTRATIONS . PART I (cont.)
EiEddb sut& ix!ma
..................................................................................................
Fuel Selector Installation
Fuel Selector Valve Control Installation
.............................................................................
Weldon Rotary Fuel Pump ...............................................................................................
....................................................................................................................
Solenoid Valve
...........................................................
Fabricated Fuel Quantity Transmitter Checking Jig
Instrument Panel. Serial Nos
. 30-1 to 30-852 incl . and
30-854 to 30-901 incl
.....................................................................................................
Instrument Panel . Serial Nos . 30-853.30-902 to 30-1716 incl .
...........................................................................................
and 30-1718 to 30-1744 incl
.......................................
Instrument Panel. Serial Nos . 30-1717 . 30-1745 to 30-2000 incl
Securing Pump ................................ .. ................................................................................
................................................................................................
Vacuum System Installation
.......................................................................................
EGT Thermocouple Installation
...............................................
............................
Generator Wlring System Schematic ..
...............................................................................................
SectionalV~ewof Generator
. . .......................................................
............................
Wiring Clrcuit, Dual Regulators ..
................................................................... ..........................
CurrentNoltage Regulator ..
.......................................................................
Use of Riffler Fieto Clean Contact Points
..................................................................................................
Voltage Regulator Air Gap
.............................
.........................
Checking Voltage SettingFixed Resistance Method
..
................
...............................
Checking Voltage SettingVariable Resistance Method
...
..........................................................................
Adjusting Voltage Regulator Setting
....................................................................
Cutout Relay Air Gap Check and Adjustment
............................
......................
Cutout Relay Point OperatingCheck and Adjustment
..
.........................................................................
Checking Cutout Relay Closing Voltage
.....................................................................
Adjustment of Cutout Relay Closing Voltage
........................................................................
Checking Current Regulator, Load Method
................................
.....................
Checking Current Regulator, Jumper Lead Method
..
.............................................................................
Checking and Adjusting Relay Air Gap
...................................................................
Checking and Adjusting Relay Point Opening
Checking Relay Closing Voltage
........................ .. .........................................................
. .
........................................................................................
Adjusting Relay Closing Voltage
..................................................................................
Alternator Wlring System Schematic
..............................................................................................
Exploded V~ewof Alternator
...........................................................................................................
Removal of Rectifier
Removal of SlipRing End Bearing
.....................................................................................
Removal of Drive End Head .................... ........ .........................................................
...........................................................................................
Removal of End Head Bearing
...............................................
Testing Rotor for Grounds
Testing Rotor for Shons
......................................................................................................
Installation of Bearing ........................................................................................................
.......................................................................................................
Installation of Rectifier
Terminal Assembly
.............................................................................................................
Slip Ring End Bearing Assembly .......................................................................................
Testing Alternator ...............................................................................................................
.......
PREFACE Revised:

PIPER TWIN COMANCHE SERVICE MANUAL
LISTOF ILLUSTRATIONS . PART I (cont.)
wia Grid No .
Brush Installation ................................ .. ..........................................................................
Internal Wiring Diagram .................................................................................................
AlternatorParalleling System .............................................................................................
RegulatorDiagram (Prestolite) ..........................................................................................
................................................................................................
RegulatorDiagram (Lamar)
TestingRegulator (Prestolite)
............................................................................................
..................................................................................................
TestingRegulator (Lamar)
. .
......................... ...........................................................
Adjust~ngRegulator (Lamar) ...
. .
Appl~cat~onof OvervoltageControl ................. .. ...............................................................
TestingOvervoltage Control .................... .. .... .. ..............................................................
NeLoad Test Hookup .......................................................................................................
................................................................................................
Lock-Torque Test Hookup
. .
.............. .......................................................................................
Res~stlveTest Hookup ..
Exploded V~ewof Gear Reduction Starting Motor ............................................................
..................................................................................
TurningStartingMotor Commutator
.....................................................................................
Testing Motor Armature for Shorts
.......................................................................................
TestingMotor Fields for Grounds
........................................................................ .............................
NeLoadTest Hookup ....
Stall-TorqueHookup ...........................................................................................................
Electrical System Components . Serial Nos . 30-1 to
30-852 incl
. and 30-854to 30-901 ................................................................................
Electrical System Components . Serial Nos . 30-853 .
..............................................................................
30-902to 30-2000. PA-39 S/N 39- 1
NOTE
Index for Electrical Schematics may
be found in Table XI-111 . Grid 3E13 .
ELT Portable Folding Antenna (Narco) ..............................................................................
ELT Using Fixed Aircraft Antenna (Narco) .......................................................................
Heating and VentilatingSystem. Serial Nos . 30-1 to
................................................................................................
................. 30-401incl ..
Heating and VentilatingSystem . Serial Nos . 30-402 to
30-852 incl
. and 30-854to 30-901 incl ..........................................................................
Heating and VentilatingSystem. Serial Nos . 30-853.
30-902to 30-2000 incl
..................... .. ........................................................................
Heater Installation (South Wind), Serial Nos . 30-1 to
30-401incl
......................................................................................................................
Flow System (South W~ndHeater) ....................................................................................
...................................................................................
Fuel Control Valve (Cutaway View)
Wiring Diagram for South Wind Heater. Model 940-DC12
...............................................
.....................................................................................
Fuel Safety Valve (Cutaway View)
Flame Detector Switch (Cutaway View
Exploded Parts View
. Heater Assembl
Ventilating Air Blower Assembly
. .
Vent~latlngAir Blower Motor .............................................................................................
Combustion Air Blower Motor ...........................................................................................
Revised:
1011/98 PREFACE

PIPER TWIN COMANCHESERVICEMANUAL
LIST OF ILLUSTRATIONS . PART I (cont.)
Eurd!h Su!&Gt
Grid No .
a
Detail of Exhaust Extensions Installation .......................................................................
Airplane Heater Assembly and Combustion Air Blower ................................................
Diagrammatic Culaway of Heater to Show Whirling
Flame Action
............................. ........... ..........................................................................
......................... ....................................................... Fuel Regulator and Shutoff Valve ..
Top V~ew . Duct Switch ......................................................................................................
Wiring Diagram ..................................................................................................................
. .
Primary Power CUCUI~ .....................................................................................................
. .
StartingPower Clrcult .......................................................................................................
Spark Plug Gap Adjustment ................................................................................................
Suggested Design for Seal Plate . Plugs and Caps for
Combustion
Tube Leakage Test ......................................................................................
Test Set-up for Combustion Air Pressure Switch ...............................................................
Exploded mew of Heater Assembly No . 751 959 ..............................................................
Exploded V~ew-CombustionAir Blower and Motor Assembly
................... ............................................................................................
No . 753905 ..
....................................................................
Suggested Set-up for Heater Operation Test
W~ringConnections for Heater Operation Test ...................................................................
Heater Fuel Valve .............. .... .......................................................................................
Oxygen System Installation, Serial Nos . 30-2 to 30-852 incl .
and 30-854 to 30-901 incl ...............................................................................................
Oxygen System Installation . Serial Nos . 30-853 . 30-902 to
................................. ............................. .
30-1716 incl and 30-1718 to 30-1744 incl ..
Oxygen System Installation . Serial Nos . 30-1717.30-1745 to
30-2000 incl
.................. ... .........................................................................................
Oxygen Tubing Installations ............................................................................................
..................................................................................................
SynchrophaserInstallation
Strobe Sensor
................. ...........................................
Pulse Generator ...................................................................................................................
Computer Assembly .......... .........................................
Fabricated Test Box .............................................................................................................
Electrical Schematic ............................................................................................................
...........................................................................
Strobe Sensor Internal Wlring Test Unit
Strobe Sensor Simulator
..... ...........................................
.................................
Patch Cable and Test Terminal
Pulse Generator Simulator .................... .. .... .. ................................................................
PREFACE Revised:
10/1/98
a

PIPER TWIN COMANCHE SERVICE MANUAL
Fieure No .
Grid No .
Balancing Stabilator ............................................................................................................
Stabilator Rigging Tool .......................................................................................................
............................................
........................
Interconnecting Control Cable Installation ..
. .
....................................................................... ...................
Checking Stabilator Fnct~on ..
Magneto ThingMarks .......................................................................................................
.........................................................................................................
Engine limingMarks
Magneto ThingMark
..................................................
.........................................................................................................
Engine liming Marks
Instrument Panel
.............................. ..........................
...............................................................
..........................
Dome Lights Schematic .............
..............................................................................................
Instrument Lights Schematic
.............................................................................................
Red Strobe Light Schematic
.......... .....................................................................
White Strobe Lights Schematic ...
a
Revised: 10/1/98
PREFACE

PIPER TWIN COMANCHE SERVICE MANUAL
LIST OF TABLES . PART I
EwcdQ. s!&w
Grid No .
U.1 .
Leading Particulars and Principal Dimensions ................... ... ......................................
ILIA . Flare Fitting Torques ...........................................................................................................
11.11. Recommended Nut Torque (Inch-Pounds)
........... .. ........................................................
I1.m . Decimal Conversion Chart ...................... .... .................................................................
.......................................
II.JlL4 . Indicated Oxygen Pressures for Given Ambient Temperatures
. .
II.N .
Recommended Lubncahng Oils .........................................................................................
II.NA . Thread Lubricant ................................................................................................................
11-V . DecimdMillimeter Equivalents of Drill Sizes ..................................................................
11-VI . Conversion Tables ......................... .. .................................................................................
11-VU . Maximum Distance Between Supports for Fluid Tubing ...................................................
III-I . Inspection Report ............................................................................................................
IV.1 . List of Materials (Thermoplastic Repair) ............................................................................
V.1 . Control Surface Travel and Cable Tension .........................................................................
V-IA . Control SurfaceTravel and Cable Tension Air Flow Modification ..................................
V-11 . Troubleshooting Chart (SurfaceControls) ..........................................................................
VII-I . Torque for Effective Wrench Length .................................... .... ..........................................
..................................................................
VII-II . Troubleshooting Chart (Landing Gear System)
. .
VU-III .
Main Gear Wear Lirmts ...................... .. .............................................................................
. .
VII-N. Nose Gear Wear L~mts
.......................................................................................................
VIII-I .
Propeller Specifications (PA-30) .........................................................................................
VIII-U .
Troubleshooting Chart (Engine) .......................................................................................
VIIIA-I .
Propeller Specifications (PA-30) .........................................................................................
VIIIA-TI . Troubleshooting Chart (Engine -Turbocharged) ............................................................
.................................................................................
IX.1 . Troubleshooting Chart (Fuel System)
................................... .............................
X-I . Troubleshooting Chart (VacuumSystem) ...........
..................................................................................
X-I1 . Troubleshooting Chart (Instruments)
.........................................................................
XI-l .
Troubleshooting Chart (Electrical System)
XI-II
.
Lamp Replacement Guide ...................................................................................................
.................................................................................
XI-III . Index . Electrical System Schematics
X1.N .
Circuit Load Chart ......................... ... ............................................................................
X1.V . Electrical Wire Coding ........................................................................................................
XI-VI . Electrical Symbols ............................................................................................................
...................... ..........................................
XIII-I . Troubleshooting Chart (South Wind Heater) ..
.............................................................................
X111-U . Troubleshooting Chart (Janitrol Heater)
............................... .....................................
XN.1 . Troubleshooting Chart (Oxygen System) ..
XN-U .
Troubleshooting Chart (Engine Synchrophaser) .................................................................
LIST OF TABLES - PART I1
................................................................
11.1 .
Leading Particulars and Principal Dimensions
......................
V.1 .
Control Surface Travel and Cable Tension
.........................................................................................
VIII-I . Propeller Specifications (PA-39)
PREFACE Revised:
10IY98

SECTION I
INTRODUCTION
Paragraph
1 .I . General ..............
...........
1.2 . Scope of Manual
.............
1.3 . Description
.........
1.4 . Fuselage
1.5 . Wing ..........
1.6 . Empennage ........
...... 1.7 . FlightControls
.......
1.8 . Landing Gea r
1.9 . Brake System .......
1.10. Engines and Propellers ...
1.11 . Fuel System ........
1.12 . Inst rumencs ........
1.13 . Electronic Equipment ....
1.14. Heating and Ventilating System
Aerofiche
Grid No.

PIPER TWIN COMANCHE SERVICE Wh'LAL
SECTION I
INTRODUCTION
1-1.
GENERAL. This manual contains service and maintenance instructions for the Piper
PA-30139
Twin Comanche, designed and manufactured as a versatile airplane in the personal
and business aviation field, by the Piper Aircraft Corporation, Lock Haven. Pennsylva~a.
2 SCOPE OF MANUAL. Sections I1 and 111 comprise the service part of this manual.
whereas Sections
N throua XTV comprise the maintenance instructions. Pan 11 of this
manual
has service information which is specifically for the PA-39 model onpi. The senice
instructions include ground handling, servicing. and inspection. The maintenance
instnrctions for each system include troubleshooting, removal and installation of
components,
and corrective maintenance and testing; each major system of the aircraft is
covered in a separate section. Only qualified personnel should perform the operations
described in this manual.
The description of the airplane included in this section is limited to gencral information.
Section
Il gives leading particulars and principal dimensions, while each major system is
described in its appropriate section of the manual. For a more detailed description of the
airplane, refer to the Owner's Handbook.
1-3. DESCRIETION. The Piper PA-30 Twin Comanche is a four-place (optional 5th and
6th seats are available in Serial Nos. 30-853, 30-902 and up) twin engine, low-wing
monoplane of all-metal construction. F'aragaphs
14 through 1-14 provide descriptions of
the major components and systems.
I. FUSELAGE. The fuselage consists of three basic units: the nose section, the 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. The wing tips are
removable. The ailerons are cable and push rod controlled and are statically and dpnam~cally
balanced. The trailing edge wing flaps are electrically operated.
I\TRODL'CTION
Issued: ! 2-19:;:

PIPER TWIN COMANCHE SERVICE MANUAL
1-6. EhlPENSAGE. The empennage consists of the fin. rudder. stabilator and stabilator
trim tab. The rudder and stabilator
are statically balanced.
1-7. FLIGHT CONTROLS. The flight controls are conventional.
consisting of a control
wheel which operates the ailerons and stabilaton, and foot pedals wh~choperate the rudder.
D~~plicatecontrols are pmvided for the copilot.
1-8. LANDING GEAR. The landing gear is an electrically operated tricycle gear. consisting
of
a nose wheel and two main wheels.
1-9. BRAKE SYSTEM. The brakes on the PA-30 are hydraulically operated by toe pedals.
1-10. ENGINES AND PROPELLERS. The airplane
is powered by two Avco-Lycoming
four cylinder, direct drive, wet sump. horizontally opposed, fuel injected engines. Tlie
propellen are Hartzell full feathering, constant speed units controlled by a governor
mounted on each engine. Some propellers are equipped with a backup spring which allows
operation of the propeller in case of loss of air from the air cylinder. These propellers are
identified
bv the letter "S" after the hub dash number. such as HC-EZYL-29s. The "S"
propeller should not be intennixed with the other propellen. Each model with its engines
and particular propellen are as follows:
IhTRODUCTIOS
Issued: 1 2,'29/7'.
Model
PA-30
!' \-30 T,~rbo
Engine
10-320-8 1 A
TO-32O-C 1.4
Octane
9 1196
100!130
Ropeller
HC-EZYL-2
HC-E2YL-2B
HC-EZYL-2BF
HC-E2YL-ZBS
HC-E2YL-2BSF
HC-EZYL-2
HC-E2YL-2B
HC-E?YL-ZBF
HC-E2YL-2BS
HC-E2YL-2BSF
H.P.
I60
160

PIPER TWIN COMANCHE SERVICE MAEUUAL
1-1 1. FUEL SYSTEM. The fuel system consists of four ~bber-typecells located in the
wings with a total fuel capacity of 90U.S. gallons. (Optional 15 U.S. gallon each, tip tanks)
two enginedriven fuel pumps. two electric auxiliary fuel pumps and two combination fuel
selectors and strainer valves.
1-1 2. INSTRUMENTS. Rovisions for the instrument installation includes panels for engine
instruments and advance flibt instruments. The panel
is shock mounted to minimize
vibration to the instruments.
1-13. ELECTRONIC EQUIPMENT. Rovision for electronic equipment includes varioc~s
combinations of radio installations and Autopilot.
1-14. HEATING AND VENTILATING SYSTEM. Heated air for the cabin and defroster is
obtained from a 25,000
BTU gasoline heater installed in the nose section. Fresh air for the
cabin interior
is obtained from two individual sources: one from the nose section and the
other from a scoop located in the speed fairing ahead of the vertical fin.
ISTRODUCTION
Issued:
1 1!29:71

PIPER TWIN COMANCHE SERVICE MANUAL
SECTION I1
HANDLING AND SERVICING
Paragraph Aerofiche
Grid No .
2.1 . Introduction ................................................................................................................... 1A22
2.2 . Dimensions ......... .. ....................................................................................................... 1A22
2.3 . Station Reference Lines ................................................................................................. 1A22
2.4 . Weight and Balance Data .................................................................................................. 1A22
2.5 . SerialNumber Plate ........................................................................................................ 1815
. .
2.6 . Access and Inspection Prov~s~ons ................................................................................ lB15
2.7
. Tools and Test Equipment ................................................................................................. 1815
2.8 . Torque Requirements ................................................................................................. 1B15
2-8a . Torque Wrenches ............................................................................................................... 1B17
2.9 . Handhold and Walkways ................................................................................................... 1B21
2-10 . Ground Handling ............................................................................................................... 1B22
2-11 . Introduction to Ground Handling .................................................................... 1822
2-12 .
.............................................................................................................
Jacking 1B22
2-13 . Weighing .......................................................................................................... 1B23
2- 14 .
......................................................................................................
Leveling 1B23
2-15 . Mooring ........................................................................................................... 1C1
2-16 . Parking .......................... .. 1C2
..............................................................................
.............................................................................................
2-17 . Locking Airplane 1C2
2-18 . Towing ............................................................................................................. 1C2
2-19 . Taxiing .................... .. 1C3
....................................................................................
..............................................................................................
2-20 . External Power Receptacle 1C4
.........................................................
2-2 1 . Operation of Extemal Power Receptacle 1C4
..............................................................................................
2-22 . Cleaning ...................... ... 1C4
2-23
.
........................................................................
Cleaning Engine Compartment 1C4
2-24
. Cleaning Landing Gear .................................................................................... 1C5
2-25 . ..............................................................................
Cleaning Exterior Surfaces 1C5
2-26
. .................................................................
Cleaning Windshield and Windows LC5
2-27 . Cleaning Headliner . Side Panels and Seats IC6
......................................................
2-28 . ..........................................................................................
Cleaning Carpets 1C6
. .
2-29 . Servlclng ........................................................................................................................ 1C6
. .
2-30 . Introduction to Servlclng .............................................................................. 1C6
2-3
1 . Landing Gear System ........................................................................................................ 1C6
2-32
. Servicing Landing Gear .................................................................................. 1C6
2-33
. Oleo Struts ............. .. .... .. ............................................................................................. 1C7
2-34
. ......................
2-35 . 1C8
2-36 .
2-37 . Brake System
2-38
.
2-39 .
Filling Brake Cylinder Reservoir
. .
2-40 . Dralnlng Brake System .......................... ........ .............................................. lClO
Revised: 1011198 HANDLING AND SERVICING

PLPER TWIN COMANCHESERVICE MANUAL
Aerofiche
Grid No
.
'lires ..................................................................................................................................
. .
Servicing lires ............................ .. ...............................................................
Power Plant ............................. .. .....................................................................................
. .
........................ .....................................................
Servic~ngPower Plant ..
Propeller.........................................................................................................................
. .
Servlc~ngPropeller .........................................................................................
. .
Power Plant Induction AuFllter......................................................................................
. .
......................................................................................
Removal of Au F~lter
. .
Induction AII Fllter .........................................................................................
...................... ...................
CleaningInductionAir Filter,Turbocharged
..
.......................................
...................... Installation of Induction Air Filter
..
. .
Vacuum SystemAu Filters ........................ .. .............................................................
..................................................................
Replacement of Central Air Filter ..........................................................
Replacement of Instrument Air Filter
Replacement of Vacuum Regulator Filters.....................................................
Fuel Systems ....................................................................................................................
. .
...................................................................................
ServiclngFuel System
............................................................................................
FillingFuel Cells
......................................................................
Draining Fuel Valves and Lies
. .
DmningFuel System.....................................................................................
Electrical System ............................... ... ............................................................................
. .
................................................. ...................
ServlclngElectrical System ...
Oxygen System ................................................................................................................
. .
.............................................
.................
Servlclngthe Oxygen System ....
................................................................
Oxygen SystemSafety Precautions
.................................................................................
Filling Oxygen Cylinder ...........................................................
Inspection and OverhaulTime Limits
. . ......................................................................................................................
Lubncatlon
Oil Systems(Engine) .......................................................................................................
. .
......................................................................................
ServlclngOil System
. .
Drainlng Oil Sump ..........................................................................................
...............................................................................................
FillingOil Sump
...............................
Oil Screen (Suction
.......................................................................................
Oil Screen (Pressure)
.........................................................................................
Oil Filter(Full Flow)
Turbo Oil Filter CleaningProcedur
.................
.................................................................
Recommendationsfor Changing Oil
. .
Lubncat~onInstructions......................................................................................................
. .
.............................................................................................
Application of Oil
. .
Appllcat~onof Grease .......................................................................................
LubricationChart ............................................
HANDLING ANDSERVICLNG Revised:
10IU98