# Lycoming O-540-G1A5

- Type: Engine model (FAA registry)
- Registry code: 42344
- Manufacturer (registry): LYCOMING
- Model: O-540-G1A5
- Engine type: Reciprocating
- Power: 260 hp
- Data sheet: [TCDS E-295](https://openairdocs.org/tcds/E-295) (OpenAirDocs)
- Holder: Lycoming Engines
- Installed in: 6 registered aircraft
- Page: https://openairdocs.org/engine/lycoming-o-540-g1a5

Model codes come from the FAA registry's reference file.

## ADs that may apply (OpenAirDocs)

Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [AD 2026-17-10](https://openairdocs.org/ad/2026-17-10): Reciprocating Engine Cylinder Section · Lycoming Engines O-235, O-235-A, O-235-AP and 159 more. Effective Sep 14, 2026
- [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026
- [AD 2022-16-03](https://openairdocs.org/ad/2022-16-03): Engine (RECIPROCATING) · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 236 more. Effective Aug 15, 2022
- [AD 2017-16-11](https://openairdocs.org/ad/2017-16-11): Reciprocating Engine Power Section · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-360-B1G6 and 93 more. Effective Aug 15, 2017
- [AD 2012-19-01](https://openairdocs.org/ad/2012-19-01): Crankshafts · Lycoming Engines AEIO-360-A1A, AEIO-360-A1B, AEIO-360-A1B6 and 321 more. Effective Oct 24, 2012
- [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012
- [AD 2009-26-12](https://openairdocs.org/ad/2009-26-12): Cylinder assemblies · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 264 more. Effective Feb 4, 2010
- [AD 2007-04-19 R1](https://openairdocs.org/ad/2007-04-19-R1): SAP cylinder assemblies · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 314 more. Effective May 7, 2007
- [AD 2006-12-07](https://openairdocs.org/ad/2006-12-07): ECi cylinder assemblies · Aerostar AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 386 more. Effective Jul 11, 2006
- [AD 2006-10-21](https://openairdocs.org/ad/2006-10-21): ECi connecting rods · Engine Components Reciprocating Engine Connecting Rods, AEIO-360-B1B, AEIO-360-B1D and 171 more. Effective Jun 22, 2006
- [AD 2005-12-06](https://openairdocs.org/ad/2005-12-06): Riveted-impulse coupling assemblies and snap-ring coupling assemblies · Lycoming Engines AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5 and 154 more. Effective Jul 19, 2005
- [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004
- [AD 2004-05-24](https://openairdocs.org/ad/2004-05-24): Zinc-plated Crankshaft Gear Retaining Bolts · Lycoming Engines AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5 and 161 more. Effective Mar 30, 2004
- [AD 99-04-04](https://openairdocs.org/ad/99-04-04): Impulse Coupling Pawl · Lycoming Engines IO-540-K1A5, IO-540-K1B5, IO-540-K1G5 and 6 more. Effective Feb 25, 1999
- [AD 97-15-11](https://openairdocs.org/ad/97-15-11): Cylinder kits · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 538 more. Effective Aug 12, 1997
- [AD 96-09-10](https://openairdocs.org/ad/96-09-10): Oil pump · Lycoming Engines AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A and 334 more. Effective Jul 15, 1996
- [AD 95-07-01](https://openairdocs.org/ad/95-07-01): Connecting Rod Bolt · Lycoming Engines AEIO-360-A1E, AEIO-360-B1G6, AEIO-360-H1A and 177 more. Effective Apr 12, 1995
- [AD 92-12-05](https://openairdocs.org/ad/92-12-05): Piston Pins · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 532 more. Effective Jul 10, 1992
- [AD 87-10-06 R1](https://openairdocs.org/ad/87-10-06-R1): Rocker Arm Assembly · Lycoming Engines IO-360-B4, IVO-360-A1A, O-340-A1A and 243 more. Effective Sep 1, 1989
- [AD 89-04-02](https://openairdocs.org/ad/89-04-02): Carburetors · Continental Motors O-470-11, O-470-11-CI, O-470-11B and 175 more. Effective Mar 8, 1989
- [AD 75-08-09](https://openairdocs.org/ad/75-08-09): Oil Pump Drive Shaft · Lycoming Engines AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C and 365 more. Effective Aug 18, 1977
- [AD 73-23-01](https://openairdocs.org/ad/73-23-01): Piston Pin Assembly · Lycoming Engines AIO-360-A1A, AIO-360-A1B, AIO-360-A2A and 215 more. Effective Jan 13, 1977
- [AD 69-24-03](https://openairdocs.org/ad/69-24-03): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 321 more. Effective Nov 29, 1969
- [AD 63-22-03](https://openairdocs.org/ad/63-22-03): Carburetors · Continental Motors GO-300-A, GO-300-B, GO-300-C and 143 more. Effective Dec 2, 1963

Historical (superseded or no longer in force):

- [AD 2024-21-02](https://openairdocs.org/ad/2024-21-02) (historical): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 548 more. Effective Dec 5, 2024
- [AD 2008-19-05](https://openairdocs.org/ad/2008-19-05) (historical): Parallel Valve'' reciprocating engines · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 262 more. Effective Oct 20, 2008
- [AD 2006-20-09](https://openairdocs.org/ad/2006-20-09) (historical): Certain crankshafts replacing · Lycoming Engines AEIO-360-A1B6, AEIO-360-A1E6, AEIO-540-D4A5 and 82 more. Effective Nov 3, 2006
- [AD 2005-26-10](https://openairdocs.org/ad/2005-26-10) (historical): ECi cylinder assemblies. · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 413 more. Effective Jan 31, 2006
- [AD 81-18-04 R2](https://openairdocs.org/ad/81-18-04-R2) (historical): Engine Oil Pump Driven Impeller and Shaft · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 376 more. Effective Jun 7, 1982

## Information bulletins (advisory) (6)

- [SAIB NE-19-08](https://openairdocs.org/saib/NE-19-08): Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders. Issued May 2, 2019
- [SAIB NE-08-32R1](https://openairdocs.org/saib/NE-08-32R1): Propeller Governor  Idler Gear Shaft Set Screw. Issued May 13, 2016
- [SAIB NE-14-13](https://openairdocs.org/saib/NE-14-13): Reciprocating Engine - Cylinder Mounting Studs. Issued Mar 24, 2014
- [SAIB NE-13-06](https://openairdocs.org/saib/NE-13-06): Pushrod Shroud Spring Retainers, Engine Components Part No. AEL14995, for Lycoming Engines 320, 360, and 540 Series Engines. Issued Nov 21, 2012
- [SAIB NE-06-32R1](https://openairdocs.org/saib/NE-06-32R1): Reciprocating Engine - Crankshaft. Issued Sep 10, 2008
- [SAIB NE-08-32](https://openairdocs.org/saib/NE-08-32) (historical): Propeller Governor Set Screw. Issued Jul 3, 2008

## Registered aircraft (6)

- [N454AB](https://openairdocs.org/aircraft/N454AB): [Aerial Banners North Inc](https://openairdocs.org/faa-owner/AERIAL%20BANNERS%20NORTH%20INC), [Pembroke Pines, FL](https://openairdocs.org/faa-place/FL/Pembroke%20Pines), built 1974, S/N 25-7556048
- [N46DJ](https://openairdocs.org/aircraft/N46DJ): [Bullough William Ronald](https://openairdocs.org/faa-owner/BULLOUGH%20WILLIAM%20RONALD), [Ocala, FL](https://openairdocs.org/faa-place/FL/Ocala), built 2012, S/N 144SR
- [N4792Y](https://openairdocs.org/aircraft/N4792Y): [Aerial Banners Inc](https://openairdocs.org/faa-owner/AERIAL%20BANNERS%20INC), [Pembroke Pines, FL](https://openairdocs.org/faa-place/FL/Pembroke%20Pines), built 1968, S/N 25-4568
- [N6793Z](https://openairdocs.org/aircraft/N6793Z): [Jnc Aviation LLC](https://openairdocs.org/faa-owner/JNC%20AVIATION%20LLC), [Saint Louis, MO](https://openairdocs.org/faa-place/MO/Saint%20Louis), built 1963, S/N 25-2438
- [N6906W](https://openairdocs.org/aircraft/N6906W): [Standard American Adjusters Inc](https://openairdocs.org/faa-owner/STANDARD%20AMERICAN%20ADJUSTERS%20INC), [Alba, TX](https://openairdocs.org/faa-place/TX/Alba), S/N 28-21072
- [N732UA](https://openairdocs.org/aircraft/N732UA): [Sonoran Aero LLC](https://openairdocs.org/faa-owner/SONORAN%20AERO%20LLC), [Phoenix, AZ](https://openairdocs.org/faa-place/AZ/Phoenix), built 1968, S/N 25-4658

## NTSB investigations (9)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ERA23LA245](https://openairdocs.org/ntsb/ERA23LA245), May 25, 2023: Piper PA-25-260 (N454AB), Hollywood, FL, substantial damage. Probable cause: The pilot’s improper banner pickup approach, which resulted in the banner tow hook contacting the airplane, and the subsequent overload separation of the right rudder control horn, resulting in a…
- [NTSB GAA17CA331](https://openairdocs.org/ntsb/GAA17CA331), Jun 11, 2017: Piper PA25 (N8578L), Hood River, OR, substantial damage. Probable cause: The pilot's failure to visually check the fuel level prior to takeoff and subsequent mismanagement of the available fuel supply during numerous glider tow flights.
- [NTSB CEN15LA297](https://openairdocs.org/ntsb/CEN15LA297), Jun 28, 2015: Piper PA 25-235 (N94MC), Galveston, TX, substantial damage. Probable cause: The loss of engine power due to a failure of a crankshaft idler gear shaft.
- [NTSB SEA06LA163](https://openairdocs.org/ntsb/SEA06LA163), Aug 19, 2006: Piper PA-25-235 (N75HM), North Plains, OR, substantial damage. Probable cause: The glider pilot's misjudgment of distance/speed during approach, which resulted in excessive speed at touchdown, and his failure to maintain directional control during the landing roll. A…
- [NTSB LAX00LA233](https://openairdocs.org/ntsb/LAX00LA233), Jun 17, 2000: Piper PA-25-260 (N8578L), Coleville, CA, substantial damage. Probable cause: the tow plane pilot's inadequate airplane performance calculations.
- [NTSB CHI98LA310](https://openairdocs.org/ntsb/CHI98LA310), Jul 17, 1998: Piper PA-25-235 (N75HM), Leland, IL, substantial damage. Probable cause: Control interference between the pilot-in-command and the student. An excessive descent rate and inadequate flare by the student during landing are contributing factors. The inadequate supervision by…
- [NTSB MKC68F0529](https://openairdocs.org/ntsb/MKC68F0529), Mar 17, 1968: Piper PA-28 (N6906W), Kearney, MO, destroyed
- [NTSB MKC68F0380](https://openairdocs.org/ntsb/MKC68F0380), Sep 25, 1967: Piper PA-28 (N6906W), Clinton, MO, substantial damage
- [NTSB MKC67F0259](https://openairdocs.org/ntsb/MKC67F0259), Sep 20, 1966: Piper PA-28 (N6906W), Parkville, MO, substantial damage

## FAA accident and incident reports (14)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20230525005769A](https://openairdocs.org/incident/20230525005769A), May 25, 2023: Piper PA-25-260 (N454AB), Pembroke Pines, FL, Destroyed. A part 91 commercial operation / banner tow accident occurred on airport after several missed attempts of banner pick ups. Aircraft destroyed and sustained…
- [Incident 20210528004169I](https://openairdocs.org/incident/20210528004169I), May 28, 2021: Piper PA-25-260 (N454AB), Palm Beach, FL, No damage. On may 28, 2021, at approximately 1530 eastern standard time, a Piper pawnee PA-25-260 (N454AB), registered to [privacy data omitted] out of pembroke pines, FL…
- [Incident 20171222023429I](https://openairdocs.org/incident/20171222023429I), Dec 22, 2017: Pa-25-260 PA-25-260 (N454AB), Hollywood, FL, Minor damage. Pilot was pulling his second banner for the day and while over the intercostal waterway he experienced loss of power. He declared mayday and landed in the…
- [Accident 20170611005339A](https://openairdocs.org/incident/20170611005339A), Jun 11, 2017: Piper PA-25-260 (N8578L), Hood River, OR, Substantial damage. While returning to airport after releasing glider at 3000' PIC noted aircraft was at 2 hours of operaton on engine tach meter. At start or day PIC estimated he…
- [Incident 20150704012319I](https://openairdocs.org/incident/20150704012319I), Jul 4, 2015: Piper PA-25-260 (N4792Y), Miami, FL, Minor damage. Pilot took off from hwo. During flight the engine quit running at approximately 1100 ft. enroute to Miami beach over star island. Pilot released banner radioed…
- [Accident 20150627009959A](https://openairdocs.org/incident/20150627009959A), Jun 27, 2015: Piper PA-25-235 (N94MC), Galveston, TX, Substantial damage. On 06/27/2015 at approximately 12:30 pm CDT an aircraft N94MC, model: PA-25-235 crashed into a field while making a forced landing. The aircraft had departed…
- [Incident 20120505007799I](https://openairdocs.org/incident/20120505007799I), May 5, 2012: Piper PA-25-235 (N94MC), Houston, TX, No damage. N94MC, a Piper PA-25-235 aircraft, while doing a banner tow operation in the vecinity of downtown Houston, TX, experienced a partial loss of power. The pilot…
- [Accident 20060819015762A](https://openairdocs.org/incident/20060819015762A), Aug 19, 2006: Piper PA25235 (N75HM), North Plains, OR, Substantial damage. (-23) Tow plane was struck by glider which lost control during landing roll. Pilot held position and shut down engine.
- [Incident 20060714013739I](https://openairdocs.org/incident/20060714013739I), Jul 14, 2006: Piper PA25260 (N4339Y), Minden, NV. (-23) On July 14, 2006 at approximately 1630 PDT, the propeller departed the aircraft at approximately 1000 feet AGL after releasing a glider during a glider…
- [Incident 20040712012049I](https://openairdocs.org/incident/20040712012049I), Jul 12, 2004: Piper PA25260 (N4339Y), Minden, NV, Minor damage. (-23) Left main gear collapsed on landing.
- [Accident 20000617008099A](https://openairdocs.org/incident/20000617008099A), Jun 17, 2000: Piper PA25260 (N8578L), Coleville, CA, Substantial damage. (-23) On June 17, 2000 at 1500 hours PDT Piper N8578L collided with a fence on takeoff from a dirt field near Coleville, CA. The a/c being operated as a tow…
- [Accident 19980717044959A](https://openairdocs.org/incident/19980717044959A), Jul 17, 1998: Piper PA25235 (N75HM), Leland, IL, Substantial damage. On July 17, 1998, a 0800 central daylight time, a Piper PA-25-235, N75HM, operated by a commercial pilot, received substantial damage on impact with terrain…
- [Incident 19970614017449I](https://openairdocs.org/incident/19970614017449I), Jun 14, 1997: Piper PA25235 (N94MC), Fort Worth, TX. Narrative: at 1400 hour (local) aircraft N94MC was towing a 20X40 billboard experienced a rope breakage that resulted in the billboard falling to the ground in…
- [Incident 19960809028089I](https://openairdocs.org/incident/19960809028089I), Aug 9, 1996: Piper PA25235 (N6793Z), Osceola, NE, Minor damage. Narrative: just as the pilot was pulling up out of a field, oil started hitting the windshield. In about 2 minutes oil pressure started dropping. The pilot…

## Service difficulty reports (8)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2019FA0000279](https://openairdocs.org/sdr/2019FA0000279), Jun 9, 2019: ENGINE. POWER LOSS. CYLINDER AND/OR SPARK PLUG FAILURE RESULTED IN A LOSS OF COMPRESSION IN ONE CYLINDER AND SUBSEQUENT POWER LOSS.
- [SDR 2003FA0000799](https://openairdocs.org/sdr/2003FA0000799), Jun 23, 2003: AXLE. FATIGUED. AIRCRAFT LANDED ON SOFT FIELD WITH A LANDING WEIGHT OF 2850 LB. THE MAX. CERTIFIED GROSS WT 2900 LB. AFTER TOUCH DOWN, APPROX 200FT DOWN THE RUNWAY. THE RIGHT M
- [SDR 95ZZZX6182](https://openairdocs.org/sdr/95ZZZX6182), Sep 12, 1995: CONTACT POINTS. FAILED. CONTACT POINTS' SOFT PLASTIC THAT RIDES THE CAM WORE DOWN UNTIL THERE WAS NO CONTACT POINT OPENING (MAG FAILURE). THE ROTATING MAGNET CONTINUED TO MAKE ELECTRIC
- [SDR 95ZZZX6183](https://openairdocs.org/sdr/95ZZZX6183), Sep 12, 1995: CONTACT POINTS. FAILED. CONTACT POINTS' SOFT PLASTIC THAT RIDES THE CAM WORE DOWN UNTIL THERE WAS NO CONTACT POINT OPENING (MAG FAILURE). THE ROTATING MAGNET CONTINUED TO MAKE ELECTRIC
- [SDR 95ZZZX5117](https://openairdocs.org/sdr/95ZZZX5117), Aug 27, 1995: CAPACITOR. CORRODED. MAG REMOVED FOR OVERHAUL AND PACKING OF BEARINGS BECAUSE OF TIME AND ROUGHNESS. CAPACITOR WAS FOUND TO BE LEAKING OR BUILDING CORROSION SIMILAR TO BATTERY CORRO
- [SDR 95ZZZX5116](https://openairdocs.org/sdr/95ZZZX5116), Aug 1, 1995: BEARING. FAILED. MAG DROP 400 RPM, BUT SMOOTH. FOUND MAGNETO DRIVE BEARING FAILURE, RETARDING TIMING. BALLS OF BEARING COMING OUT OF BEARING CAGE AND EATING UP THE REAR OF CASE 
- [SDR 95ZZZX3219](https://openairdocs.org/sdr/95ZZZX3219), May 19, 1995: VALVE KEY. BROKEN. FOUND EXHAUST VALVE KEY HAD BROKEN AND WORN ABOUT ONE-THIRD OF THE DIAMETER OF THE VALVE STEM.
- [SDR 95ZZZX1733](https://openairdocs.org/sdr/95ZZZX1733), Mar 3, 1995: IMPULSE COUPLING. WORN. MAG INSPECTION FOUND FLYWEIGHT TO AXLE CLEARANCE BEYOND LIMITS.

## STCs that may be installed (OpenAirDocs) (39)

Approved for this engine model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC
- [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines. B & C Specialty Products Inc
- [STC SE2932SW](https://openairdocs.org/stc/SE2932SW): Install carburetor air temperature indicator. Approved for Aircooled Motors (Franklin Engine Co.) equipped with float carburetors. Model eligibility included here may not be inclusive. Alcor LLC. Lists O-540 Series
- [STC SE208SO](https://openairdocs.org/stc/SE208SO): Installation of ice indicator in the carburetor. LegacySTC.com. Lists O-540 Series
- [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd
- [STC SE01954SE](https://openairdocs.org/stc/SE01954SE): Installation of engine crankcase seal. Ly-Con Rebuilding Company
- [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc
- [STC SE00939WI](https://openairdocs.org/stc/SE00939WI): Installation of B&C Specialty Products Model BC 315-( ) Starter on Lycoming engines. B & C Specialty Products Inc
- [STC SE2388CE](https://openairdocs.org/stc/SE2388CE): Installation of B&C Speciality Products lightweight (10.2) pounds) engine starter, part number BC-315-100-1 (12 volts) or part number BC-315-100-3 (24 volts). B & C Specialty Products Inc. Lists O-540 Series
- [STC SE03309CH](https://openairdocs.org/stc/SE03309CH): Installation of Engine Preheat Kit, p/n TSP6CYL-2927-115 for 115 volt application. Hartzell Propeller Inc
- [STC SE01436LA](https://openairdocs.org/stc/SE01436LA): Installation of Firewall Forward Technologies LLC modified camshaft. Centri-lube Technologies LLC
- [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp
- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc
- [STC SE8628SW](https://openairdocs.org/stc/SE8628SW): Installation of oil nozzles for lubrication of cam and filters. Cygnet Aerospace Corp
- [STC SE4408SW](https://openairdocs.org/stc/SE4408SW): Miscellaneous engine cylinder replacement parts. Continental Motors, Inc. Lists O-540 Series
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists O-540 Series
- [STC SE00218NY](https://openairdocs.org/stc/SE00218NY): Replacement of Lycoming starter with SKY-TEC 12 volt starter installed. Hartzell Engine Technologies, LLC. Lists O-540 Series
- [STC SE00226NY](https://openairdocs.org/stc/SE00226NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter Models 149-24HT and 122-24HT. Approval limited to 24-volt DC source available to the starter. Hartzell Engine Technologies, LLC
- [STC SE00357NY](https://openairdocs.org/stc/SE00357NY): Replacement of Lycoming starter with SKY-TEC 24-volt starter installed. Hartzell Engine Technologies, LLC. Lists O-540 Series
- [STC SE2901NM](https://openairdocs.org/stc/SE2901NM): Lycoming valve cover gasket. Real Gaskets Tennessee
- [STC SE00768CH](https://openairdocs.org/stc/SE00768CH): Replace Slick 6000, 6100, 6200 and 6300 series magnetos and TCM/Bendix S6-20, S6-200 and S6-1200 series magnetos with the Champion Limited Authority Spark Advance Regulator (LASARTM) ignition system. Champion Aerospace LLC
- [STC SE8193SW](https://openairdocs.org/stc/SE8193SW): Grind nitriden high compression cylinder barrles to plus .010 oversize and install SL75089 P10 piston, SL74242 P10 compression ring, and SL73857 P10 oil ring. Superior Air Parts Inc
- [STC SE7734SW](https://openairdocs.org/stc/SE7734SW): Modification of engine for operation with ethanol fuel. Shauck Dr Maxwell E Jr
- [STC SE1779NM](https://openairdocs.org/stc/SE1779NM): Installation of Precise Flight, Inc. Standby Vacuum System SVS III. Precise Flight Inc
- [STC SE5743NM](https://openairdocs.org/stc/SE5743NM): Intallation of adapter for externally mounted oil filter. Aviation Development Corporation
- [STC SE00890LA](https://openairdocs.org/stc/SE00890LA): Installation of Nickson's cylinder barrels on Lycoming reciprocating engine models. Nickson's Machine Shop Inc. Lists O-540 Series
- [STC SE1-201](https://openairdocs.org/stc/SE1-201): Installation of the Richter Aero Equipment Type B-4 or B-5 Temperature Probe. (O-360 SERIES (excl. A1C, C2B, C2D)). MidContinent Instru Co Inc. Lists O-540 Series
- [STC SE09492SC](https://openairdocs.org/stc/SE09492SC): Installation and usage of Exxon 20W50 multigrade aircraft engine oil conforming to Exxon Oil formulation WS-3013. Exxon Company USA. Lists O-540 Series
- [STC SE8023SW](https://openairdocs.org/stc/SE8023SW): Installation and usage of AEROSHELL. Shell Development Co. Lists O-540 Series
- [STC SE2653CE](https://openairdocs.org/stc/SE2653CE): Add leaded and unleaded automotive gasoline, 91 minimum antiknock index (RON+MON)/2 per ASTM Specification D-439. Petersen Aviation Inc
- [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp. Lists O-540 Series
- [STC SE5879SW](https://openairdocs.org/stc/SE5879SW): Use of Phillips X/C II 20W-50 and25W-60 oil (OSS 55875) in all Avco reciprocating aircraft engines from 65 to 450 BHP. Phillips Petroleum Co. Lists O-540 Series
- [STC SE5924SW](https://openairdocs.org/stc/SE5924SW): Installation of stainless steel replacement exhaust studs on AVCO engines. Perrigo & Steele Aircraft Engr Company. Lists O-540 Series
- [STC SE244NE](https://openairdocs.org/stc/SE244NE): Installation of Mattituck plasma flame sprayed cylinder barrels in Teledyne reciprocating engines. Mattituck Airbase, Inc. Lists O-540 Series
- [STC SE80NE](https://openairdocs.org/stc/SE80NE): Installation and usage of Bel-Ray synthetic aviation oil, Bel-Ray Aero 1, (nonsupercharged), horizontally opposed direct drive, aircraft engines of 350 hp. or less. Bel-Ray Company, Inc. Lists O-540 Series
- [STC SE1445SO](https://openairdocs.org/stc/SE1445SO): Use of Aero-blend oil additive in Teledyne (non turbocharged) aircraft engines. ProTec. Lists O-540 Series
- [STC SE128NE](https://openairdocs.org/stc/SE128NE): Use of AMS/OIL 15W 50 synthetic piston aircraft oil in Avco engines. AMS/OIL. Lists O-540 Series
- [STC SE44WE](https://openairdocs.org/stc/SE44WE): Use of Kling Aviation Oil, Specifications KL-100, KL-200 and KL-300 in Continental and Lycoming engines. Kling Oil Company. Lists O-540 Series
- [STC SA01436DE](https://openairdocs.org/stc/SA01436DE) (historical): Installation of Firewall Forward Technologies, LLC modified camshaft. Centri-Lube Technologies LLC

## PMA parts (OpenAirDocs) (over 1,000, first 50)

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this engine model on its data sheet, so check the FAA record before relying on it. Newest first.

- [72-231114-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID157761992320260722204351.0001): TAG-Engine. Swift Fuels, LLC · PMA PQ04423CE · Modification part · Jul 17, 2026
- [ES66M19385](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID186804045820251216184409.0001): Clamp, Magneto. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 66M19385 · Nov 10, 2025
- [ES10-400567](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID182838314420251216184405.0001): Bearing, Ball. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-400567 · Nov 10, 2025
- [ES10-349249](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID172741321620251216184404.0001): Washer, Bowed. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349249 · Nov 10, 2025
- [ES10-180046-28](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID170373951520251216184357.0001): Sleeve, Clear. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-180046-28 · Nov 10, 2025
- [ES10-349247](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID155835169920251216184407.0001): Retainer, Bearing. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349247 · Nov 10, 2025
- [ES10-78655](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID148578074420251216184359.0001): Washer, Flat. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-78655 · Nov 10, 2025
- [ES10-35937-24](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID131353354520251216184356.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-35937-24 · Nov 10, 2025
- [ES-349290-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID124195582920251216184349.0001): Magneto Assembly, S-1200 Series, 6 Cyl. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces LW-349290-1, LW-349290-1D, 75454… · Nov 10, 2025
- [ES-349310-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID117952123520251216184351.0001): Magneto Assembly, S-1200 Series, 6 Cyl. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces LW-349310-1, LW-349310-1D, 75453… · Nov 10, 2025
- [ES-349370-4](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID117076779520251216184355.0001): Magneto Assembly, S-1200 Series, 6 Cyl. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces LW-349370-4, LW-349370-4D, 75453… · Nov 10, 2025
- [ES10-5752](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID115793636520251216184401.0001): Cable, Clip. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-5752 · Nov 10, 2025
- [ES10-349328](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID114147850320251216184403.0001): Flat Washer. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349328 · Nov 10, 2025
- [ES10-349221](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID111222593020251216184358.0001): Stud, Hex 10-32. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349221 · Nov 10, 2025
- [ES10-349242](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID110743662720251216184408.0001): Gear, Spur, 1200 Series, 6-Cyl. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349242 · Nov 10, 2025
- [ES10-349243-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID108636864620251216184402.0001): Cam, 1200. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349243-2 · Nov 10, 2025
- [AB-160844](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100141747720251216184413.0001): Spring & Brush Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-160844 · Nov 10, 2025
- [OC](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID178549155320250923184433.0001): Oil Cooler Preheat Kit. Hartzell Propeller LLC · PMA PQ2040CE · Modification part · Sep 12, 2025
- [AE45BS](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID187750711420250908153020.0001): Brush Rack Assembly. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number ALU1045BS · Aug 27, 2025
- [AE943](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID185624017520250908153027.0001): Rotor Shaft. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number ALU-228 · Aug 27, 2025
- [AE45BS-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID173583138520250908153031.0001): Brush Rack Assembly. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number ALU-1045BS · Aug 27, 2025
- [AE15BA](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID167463833220250908153021.0001): Brush Rack Assembly. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number ALV-1015 · Aug 27, 2025
- [AE944](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID157009852420250908153027.0001): Rotor Shaft. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number ALE-273 · Aug 27, 2025
- [AE45BS-E](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID143460060920250908153031.0001): Brush Rack Assembly. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number ALE-1045BS · Aug 27, 2025
- [AE2241](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID127316494620250908153022.0001): Fan Assembly. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number 90-2241 · Aug 27, 2025
- [AE2259](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID112306055120250908153022.0001): Fan Assembly. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Number 90-2259 · Aug 27, 2025
- [AE1132](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID103582853720250908153023.0001): Slip Ring End Housing. Aerospace Turbine Rotables · PMA PQ3736CE · Replaces Prestolite Part Numbers ALK-1132AS… · Aug 27, 2025
- [SL6](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID151538433320250923185921.0001): Engine Preheat Kit. Hartzell Propeller LLC · PMA PQ2040CE · Modification part · Aug 4, 2025
- [TXPL6](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID146504457020250923185923.0001): Engine Preheat Kit. Hartzell Propeller LLC · PMA PQ2040CE · Modification part · Aug 4, 2025
- [HSS](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID104096221220250923185925.0001): Engine Preheat Kit. Hartzell Propeller LLC · PMA PQ2040CE · Modification part · Aug 4, 2025
- [AA48111-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID120682187320240813134136.0001): Oil Filter. Aero Accessories LLC · PMA PQ1206CE · Replaces Aero AccessoriesAA48111Champion… · Jul 12, 2024
- [ES3018](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID194884707820251216184204.0001): Clamp, Bearing Cap. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3018 · May 20, 2024
- [AM-3021](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID194256093820251216184144.0001): Screw Distributor Block. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3021 · May 20, 2024
- [ES5617](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID190223284620251216184226.0001): Machining, Rotating Magnet. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M5617 · May 20, 2024
- [ES3221](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID189601053820251216184228.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3221 · May 20, 2024
- [AK-3975](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID181109606820251216184201.0001): Coil, Ignition. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3009, M3114, M3525, K3975, K3975 · May 20, 2024
- [AM-3015](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID180990573320251216184149.0001): Screw, Housing. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3015 · May 20, 2024
- [AM-3006](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID178460806720251216184151.0001): Bearing. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3006 · May 20, 2024
- [AM2536](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID175576430320251216184152.0001): Woodruff Key. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M2536 · May 20, 2024
- [ES3040](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID175045989620251216184205.0001): Coil Wedge. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3040 · May 20, 2024
- [ES917](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID170587168620251216184202.0001): Impulse Coupling Spring. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M917 · May 20, 2024
- [AK-3984](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID168254730520251216184200.0001): Capacitor. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3183, K3984 · May 20, 2024
- [AM-2556](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID164604517920251216184155.0001): Cotter Pin. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M2556 · May 20, 2024
- [ES3637K](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID163564757720251216184213.0001): Contact Point Secondary. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3637 · May 20, 2024
- [ES3084](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID152458666320251216184211.0001): Air Vent With Hood. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3084 · May 20, 2024
- [AM-3217](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID152412216720251216184157.0001): Wave Spring Washer. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M-3217 · May 20, 2024
- [AM-3485](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID151878274520251216184156.0001): Bearing Cap, Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3485 · May 20, 2024
- [AM-3215](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID151335825620251216184148.0001): Brush Assy, Distributor. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3215 · May 20, 2024
- [ES3327](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID147426243320251216184226.0001): Machining, Rotating Magnet. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3327 · May 20, 2024
- [ES3823](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID146282172620251216184219.0001): Dist. Block & Gear Assy.. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces K3823 · May 20, 2024

All of them: https://openairdocs.org/engine/lycoming-o-540-g1a5/pma.md

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OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.