Service Letters

Comanche and Twin Comanche Service Letters

Listing from 762-332: Service Bulletin and Service Letter Index, May 19, 2020 Revision

Available from Piper directly.

Number Subject Models Affected Date Part/Kit No. A.D. No.1 ATA Code Grid
177 Firewalls All PA-24 Models 8/10/51 13B13
207 Oil Quick Drain Valve Assembly, Part No 12956-04 PA-24 6/18/53 13C4
283A Inspection Forms 100/500/1000 Hour PA-24 2/26/58 500 13E24
295A Aircraft Finishes PA-24, PA-30 1/3/64 13F12
299 Cabin Door Lower Hinge Reinforcement, Cabin Door Holder And Landing Gear Oil Level Instructions PA-24-180, PA-24-250 6/10/58 ** 2 5210 13F15
301 PA 24 Comanche Landing Gear PA-24 8/12/58 3200 13F20
302 Fuel Gauge Ground Wire PA-24-180, PA-24-250 8/19/58 2840 13F21
303A Aircraft Finish PA-24 9/23/59 5300 13F23
305 Miscellaneous Modifications; Door Latch, Oil Separator Inlet Hose, Landing Gear Retraction Tube Arm PA-24-180, PA-24-250 10/1/58 ** 2 58-25-05 5200, 7920, 3230 13G14
310 Locking of Landing Gear Motor Release Arm PA-24-180, PA-24-250 11/10/58 3230 13H1
311 PA-24 1959 Owners Handbook PA-24 11/22/58 General 13H3
312 Tooling - Piper Autocontrol PA-24 11/24/58 ** 2 2210 13H4
314A Landing Gear Warning System PA-24-180, PA-24-250 6/8/59 754-221, 754-217 3260 13H6
315 PA-24 Comanche Landing Gear Transmission Assembly PA-24 2/4/59 3200 13H7
316 Cabin Sealing PA-24-180, PA-24-250 4/7/59 ** 2 5300 13H16
317 50 Ampere Generator Installation PA-24-180, PA-24-250 4/6/59 754-230 2400 13H18
321 Piper Autocontrol PA-24 7/8/59 2210 13H22
323 Defroster Operation PA-24-180, PA-24-250 11/23/59 2140 13H24
324C Maintenance And Inspection of Exhaust Systems And Heat Exchanger PA-24 1/22/69 62-26-05, 68-05-01 7810 13I1
325 Front Cabin Window Defroster Kit PA-24-180, PA-24-250 12/24/59 754-293 2140 13I9
333C Radio Shelf Capacities All PA-24 1/28/63 3400 13J13
339 Insulation of Wiring At Starter Solenoid Switch PA-24-180, PA-24-250 7/12/60 13586-94 8010 13J21
345 Hartzell Service Bulletin #75 - Inspection of Hartzell Governor For Presence of Vent Hole PA-24-250 9/14/60 6110 13K5
346 Relocation of Safety Belt Buckle - Right Front Seat Only PA-24-180, PA-24-250 9/29/60 5340 13K8
347 Installation of Dry Vacuum Pump, Exhaust Tube PA-24-180, PA-24-250 12/2/60 754-358 3710 13K9
352 Modification of Windshield Defroster System PA-24-180, PA-24-250 12/28/60 754-380 2140 13K14
356 Installation of Landing Gear Retraction System, 30 Amp Circuit Protector PA-24-180, PA-24-250 3/31/61 454-661 63-27-03 3230 13K21
360 Flap Retractor PA-24-180, PA-24-250 9/5/61 754-413 2750 13L3
364A Rubatex Blocks In Detached Or Loose Wing Panels PA-24-180, PA-24-250 3/14/62 5700 13L15
365 Special Bolt For Nose Gear Drag Link PA-24-180, PA-24-250 1/3/62 22066-00 3200 13L17
366 Nose Gear Clevis PA-24-180, PA-24-250 1/3/62 20859-03 65-25-03 3220 13L19
367 Caps, Fuel Cell, “Thermos Bottle” Type PA-24-180, PA-24-250 2/1/62 68-13-03 2810 13L21
368 Lycoming Service Instruction #1049 Dated 12/29/61 PA-24-250 2/7/62 ** 2 7200 14A1
370 Modification To Engine Breather Line PA-24, PA-24-250 2/23/62 7200 14A7
372 Landing Gear Switch PA-24-250 3/8/62 3230 14A10
373 Dry Vacuum Pumps (Airborne Mechanisms) Models 113A1 And 113A5, Installation of Oil Shields On PA-24-180, PA-24-250 3/29/62 756-143 3710 14A11
379 Landing Gear Safety Switch Harness PA-24-180, PA-24-250 8/10/62 754-475 64-22-03 3200 14A20
380 Door Hinges, Main Landing Gear, And Nose Gear Door Hinge Bushings PA-24-180, PA-24-250 8/8/62 ** 2 3210 14A22
382 Redesigned Landing Gear Selector Switch Knob PA-24-250 9/27/62 ** 2 3200 14B1
393 Replacement of Bendix Fuel Pump PA-24-250 2/1/63 481-686 2820 14B22
395 Flap Retraction Springs PA-24-250 2/11/63 83302-54 2750 14C1
397 Inspection of Alternate Air Door Hinge Pin PA-24-250 2/21/63 7160 14C5
404 Inspection of Pitch Servo Assembly Chain Adjustment Screw Altimatic And Altimatic II PA-24-180, PA-24-250 9/16/63 ** 2 2210 14C17
408 Installation of Fuel Valve Control Stop PA-30 10/9/63 756-774 7320 14D1
409 Replacement of Nose Gear Retraction Tube PA-30 10/9/63 21109-05 64-16-06 3230 14D4
411 Drain Holes In PA-30 Cowling PA-30 10/17/63 7110 14D8
412A Muffler And Tailpipe Support PA-24-250 5/6/64 756-775 68-05-01 7810 14D11
414 Modification of Right Side Exhaust Stack PA-24-250 11/27/63 756-777, 756-778 7810 14D15
415 Sealing of The Nose Wheel Well PA-30 12/3/63 3240 14D18
416 Heater Valve Friction Spring Installation PA-30 12/3/63 756-779 2140 14D20
417 Replacement of Fuel Injector Inlet Screens PA-30 12/16/63 756-782 7310 14E1
418 Replacement of Fuel Flow Gauge PA-30 12/16/63 24536-00 7330 14E3
419 Inspection of Heater Air Distribution Box Attachment Screws PA-30 2/24/64 ** 2 2140 14E4
420A Removal of Vanes From Throat of Carburetor Air Box PA-24-250 3/10/72 64-10-04 7200 14E6
422 Rework of Propeller Spinner Assembly PA-30 3/10/64 756-796 6110 14E11
424 Installation of “Generators On” Placard PA-30 4/20/64 ** 2 2430 14E15
425 Lycoming Service Bulletin No. 298 PA-24-180, PA-24-250 5/13/64 ** 2 7200 14E17
426 Propeller Flange Inspection, Crankshaft (Per Lycoming Service Bulletin No. 300) And Propeller Blades, Inspection of (Per Hartzell Service Bulletin No. 86) PA-30 6/26/64 6110 14E22
430 Inspection of Nose Gear Drag Link Assembly PA-30 8/17/64 3220 14F6
431 Insulation of Motor Mounts PA-24-250 9/2/64 756-831 7120 14F8
433 Installation of Placard, (Cowl Flaps Open) PA-24-400, PA-30 9/9/64 755-881 7110 14F12
434 Lycoming Service Instruction #1110 PA-24-250 9/30/64 25006-00 7200 14F14
435 Relocation of Nose Wheel Steering Tube Boot PA-24-250 9/30/64 21378-00 3250 14F15
437 Replacement of Fuel Gauge Assembly PA-24-400 11/4/64 450-771 2820 14F19
439 Lycoming Service Bulletin No.300A PA-30 11/13/64 6110 14G1
440 Engine Compartment Changes PA-24-400 12/3/64 ** 2 7200 14G4
444 Installation of Special Steel Fittings On Auxiliary Fuel Pumps PA-24-250 2/24/65 751-268 2810 14G9
445 Installation of Nose Gear Drag Link Clevis Reinforcement Bracket PA-24-180, PA-24-250 4/21/65 756-911 3270 14G11
446 Fuel Leakage At the Fuel Cell Gauge PA-24-400 3/1/65 756-902 2810 14G13
447 Inspection of Landing Gear Transmission Retract Spring All PA-24, PA-30 3/26/65 ** 2 3230 14G14
449A Fuel Cells PA-24-180, PA-24-250, PA-24-400, PA-30 2/18/69 2810 14G16
451 Fuel System Purging Valve PA-24-400 5/14/65 756-922 66-30-07 2810 14G18
453 Engine Mount Refinishing PA-24-400 8/23/65 756-306 7110 14G19
459 Mixture Control Cable Shield PA-24-400 10/6/65 25079-00 7320 14H8
460 Revision To PA-30 Service Manual And Owner’s Handbook PA-30 9/17/65 3260 14H10
461 Inspection of Propeller Blades PA-30 9/28/65 6110 14H11
464A Bendix RS Fuel Injection PA-24-250, PA-24-260, PA-30 11/12/65 ** 2 7310 14I1
465 Airworthiness Directive No. 65-25-03 PA-24, PA-24-250 12/20/65 1617 14I3
469 Replacement of Allowance Placard, Baggage/Passenger PA-24-260 2/11/66 756-997 5430 14I7
470 Starter Vibrating PA-24-400 4/1/66 492-671 8010 14I8
477 FAA Airworthiness Directive No. 66-12-2 (Temporary Revision To Airspeed Limits) PA-30 5/18/66 3410 14I19
478 Inspection of Baggage Door Latch Enlargements PA-24-260 6/13/66 66-18-04 5210 14I22
481 Muffler And Tailpipe Support PA-24-250 9/15/66 757-058 68-05-01 7810 14J2
486A Cylinder Head Temperature Probe Location PA-24 4/16/68 7720 14J13
490 Rajay Corporation Service Letter No. 10 (Relocation of Turbocharger Low Oil Pressure Warning Light Wire) PA-30 6/28/67 757-312 7930 14J16
511 Modification To The Auxiliary Power Receptacle Installation PA-24-260, PA-39 8/30/68 760-181, 760-711 2400 14K23
516 Modification Fuel Cell Vent System PA-24-180, PA-24-250 3/7/69 760-277, 760-281 68-13-03 2810 14L11
518 Modification of Exhaust Mufflers PA-24-260 1/22/69 760-289 68-05-01 7820 14L14
525 Addition of Lock Washers To Electrical Switch Installations PA-30 2/28/69 ** 2 2400 15A8
532 Voltage Regulator Component Grounding PA-30 7/7/69 760-332 2430 15B2
539 Fuel Selector Valve Control Handle Replacement PA-30 2/18/70 760-356, 760-357 2820 15B20
541 Fuselage Nose Cone Drain Holes PA-30 12/4/69 5350 15C1
542 Control Surface Travel And Cable Tension PA-30 2/17/70 2700 15C3
543 Induction System Drain Tube Relocation PA-24-260 “C” 11/17/69 760-351 7160 15C5
546A Nose Gear Push-Pull Rod Assembly PA-24-180, PA-24-250, PA-24-400 3/10/70 757-352 3250 15C12
549 New Owner’s Handbook PA-30 3/20/70 ** 2 General 15C19
552 Counter Rotating Power Plant Conversion-Kit PA-30 5/1/70 760-368 7100 15D3
556A Turbocharger Waste Gate Return Spring PA-30, PA-39 9/21/70 ** 2 8120 15D17
557 Rajay Oil Scavenge Pump PA-30 6/16/70 ** 2 7250 15D19
558 Air Flow Modification Kit PA-30 7/1/70 760-409 2700 15E1
564 Revised Hartzell Propellers PA-30, PA-39 9/28/70 ** 2 6120 15E18
565 Rear Cabin Dome Light Mounting Screw PA-24-260, PA-30, PA-39 10/13/70 3320 15F1
566 Autopilot Servo Spacer Bushing Installation PA-24-260, PA-30, PA-39 11/25/70 760-472 2210 15F3
569 Engine Compartment Modifications PA-24-260 12/28/70 760-463 7200 15F14
574 Revision To Emergency Gear Checklist PA-24-260, PA-30, PA-39 3/22/71 3200 15F20
575 Landing Gear (Nose) System Inspection PA-30, PA-39 4/8/71 3220 15F23
578B Fuel Line (Stainless Steel Tube Assy.) and Support Clamp Inspection and Installation, Lycoming Service Bulletin No. 342F PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 7/27/11 N/A 2011-26-04 7310
584 90 Amp Alternator Circuit Breaker Switch Inspection PA-30, PA-39 7/8/71 2430 15H4
589 Stainless Steel Fuel Selector Valve Housing PA-30 8/18/71 757-187 83-10-01 2820 15H10
595 Wing Flap System Maintenance PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 10/11/71 2750 15I1
596A Nose Landing Gear System Product Advancement Information All PA-24, PA-30, PA-39 9/5/75 ** 2 3220 15I3
598 Adjustable Duct Micro Switch Inspection PA-39 11/16/71 487-940 2140 15I9
599 Exhaust Wing Panel Corrosion Protection PA-30, PA-39 11/23/71 5750 15I10
605 Reissue of Owner’s Handbook PA-24-260T 2/7/72 ** 2 8100 15J1
609 Control Surfaces Inspection And Maintenance Guidelines All Models 2/21/72 5500 15J21
610 Tail Control Surface Inspection, Maintenance And Repair Information PA-24 Comanche Service Manual Temporary Revision TR 720127 All PA-24 2/28/72 ** 2 2700 15J23
617B Piper Automatic Locator Transmitter Replacement PA-24, PA-39 8/30/73 72-22-03 2560 15K18
623 Inspection of Rajay Alternate Air Valve Bracket PA-30, PA-39 T.C. 8/9/72 ** 2 7160 15L14
627 Propeller Installation PA-24-260, PA-30, PA-39 9/1/72 6100 16A1
633 Inspection And Repair of Flood Exposed Airplanes PA-24, PA-39 10/9/72 5300 16A18
636 Prestolite Service Bulletin No. ASM-8 (Alternator Fan Replacement) PA-24, PA-30 10/24/72 ** 2 2430 16B2
637 Rajay Service Letter No. 19, Dated September 5, 1972 PA-30, PA-39 T.C. 10/31/72 ** 2 7160 16B5
638A Edo-Aire Mitchell Service Letter No. ML-35 (Servo Lubrication - Rack And Pinion Type Servos) PA-24, PA-30 2/8/73 2210 16B7
642 Revised Alternator Inoperative Warning Light PA-39 2/19/73 760-711 2430 16B15
648 Battery Ground Inspection And Modification PA-24-260 “C” 3/8/73 2430 16C2
650 Inspection of Transmission Assemblies, Landing Gear Retraction And Flap Control PA-24-180, PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 9/27/73 ** 2 3230, 2750 16C5
651 Rudder Balance Weight Arm Attachment Angle Installation Kit PA-24-180, PA-24-250, PA-24-260 2/27/73 760-732 2720 16C10
653 Throttle Lever And Shaft, Serrated (Reference Avco Lycoming Service Instruction No. 1265 Dated December 15, 1972) PA-24, PA-30 4/9/73 ** 2 7610 16C14
657 Fuel Selector Valve Control Handle Modification PA-30, PA-39 9/13/73 760-788 2820 16D3
665A Intake Valves; Rotator Type (Reference Avco Lycoming Service Instruction No. 1280 A. 9/28/73) PA-24-400 10/24/73 ** 2 7160 16D16
667A Stabilator Attachment Bolts PA-24-260, PA-24-400, PA-30 30/4/74 ** 2 74-13-03 2740 160
679 Fuselage Aft Bulkhead Inspection PA-30, PA-39 1/21/74 760-783 74-16-08 5310 16F2
682B Reference Lycoming Service Bulletin 367D PA-24-250, PA-24-400, PA-30 4/19/74 ** 2 7230 16F9
686 Inspection of Fuel Pressure Hose Assembly PA-24-250, PA-24-260 1/3/74 17766-43 7330 16F20
687 Stabilator Modification PA-24-250, PA-24-260 6/19/74 760-747 72-22-05 2740 16F23
695 Roll Servo Inspection, Maintenance And Sheer Pin Installation (Reference Attached Edo-Aire Mitchell Service Letter No. ML-38 Dated March 18, 1974) PA-24, PA-30 5/3/74 ** 2 2210 16G13
696 Control Surface Balancing Recommendation PA-24, PA-30, PA-39 5/2/74 2700 16G20
707 Flyball Assembly To Improve RPM Control. Modified (Reference Hartzell Service Letter No. 75, Dated November 16, 1973) PA-24, PA-30, PA-39 2/27/74 ** 2 7710 16I11
718 Bendix Magneto Bulletin No. 566 (Reference Avco Lycoming Service Bulletin 373, Dated March 22, 1974) PA-24 5/31/74 ** 2 7410 16J18
751 Fin Front Spar Modification PA-24-180, PA-24-250, PA-24-260, PA-24-400 7/7/75 5520 17A23
758 Bendix Ignition Switches, Inspection of; Ref: Bendix Service Bulletin No. 583 PA-24-180, PA-24-250, PA-24-260, PA-24-400 5/17/76 761-065V 7410 17C2
772 Stabilator Attachment Bolts PA-39 2/16/76 ** 2 74-13-03 2740 17E4
777 Fin Front Spar Modification PA-30, PA-39 6/16/76 76-18-05 2740 17E12
782B Landing Gear Manual Extension System And Nose Gear Down Lock Spring Installation PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 12/1/77 ** 2 77-13-21 3230 17E23
787 Aileron Spar Inspection And Reinforcement PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 12/1/76 760-914 77-08-01 5750 17F17
850 Aileron Nose Rib Inspection/Reinforcement PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 4/18/79 79-20-10 5750 17L8
851 PART A - Fuel Valve Internal Leak Check PA-24-400, PA-30, PA-39 8/31/78 ** 2 79-12-08 2810 17L11
851 PART B - Fuel System Draining Procedure-Water Contamination PA-30, PA-39 8/31/78 ** 2 79-12-08 2810 17L12
851 PART C - Fuel System Draining Procedures-Water Contamination PA-24-400 8/31/78 79-12-08 2810 17L14
1041A Accident/Incident Reporting All 3/17/2020 N/A N/A
1052 Life Limited Parts Marking and Disposition All 5/21/02 N/A 510 19L19
1069 Flight Control Cable Terminal Corrosion Inspection All 3/31/03 N/A CE-02-05 (SAIB) 2702 20C2
1093B Electrical Contactor Replacement Kit PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 11/28/17 88371 2400
1116A Contactor Maintenance PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, PA-39 3/15/2019 N/A 2435
1135 Control Cable / Pulley Inspections All 10/19/2010 N/A 5720
1141 Gascolator Maintenance Procedures PA-24, PA-24-250, PA-24-260, PA-24-400 4/27/2011 MS20995-C32 2800
1265 Flight Control System Checks All 8/6/2019 N/A 2700
1274 Hartzell Propeller Preferred Grease All 1/6/2020 NYCO GN 3058 6110
1280 Rudder Pedal And Bar Assembly All 2/14/2020 N/A 2720

  1. Reference latest FAA Bi-Weekly Listing for current A.D. Information. ↩︎

  2. Reference appropriate service letter for material identification and/or appropriate aircraft model. ↩︎

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