# Lycoming O-540-A1D5 - Type: Engine model (FAA registry) - Registry code: 42324 - Manufacturer (registry): LYCOMING - Model: O-540-A1D5 - Engine type: Reciprocating - Power: 250 hp - Data sheet: [TCDS E-295](https://openairdocs.org/tcds/E-295) (OpenAirDocs) - Holder: Lycoming Engines - Installed in: 18 registered aircraft - Page: https://openairdocs.org/engine/lycoming-o-540-a1d5 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 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 2005-19-11](https://openairdocs.org/ad/2005-19-11): Crankshafts · Lycoming Engines AEIO-360-A1B6, AEIO-360-A1E6, AEIO-540-D4A5 and 59 more. Effective Oct 21, 2005 - [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 98-17-11](https://openairdocs.org/ad/98-17-11): Crankshafts · Continental Motors A-65-3, A-65-8, A75-8 and 90 more. Effective Oct 19, 1998 - [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 66-06-03](https://openairdocs.org/ad/66-06-03): Connecting Rod Assemblies · Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2 and 317 more. Effective Jan 16, 1969 - [AD 66-20-04](https://openairdocs.org/ad/66-20-04): Oil Filter Adapter Gasket · Lycoming Engines IO-320-A1A, IO-320-A2A, IO-320-B1A and 121 more. Effective Aug 27, 1966 - [AD 64-16-05](https://openairdocs.org/ad/64-16-05): AC Pumps · Lycoming Engines HIO-360-B1A, HIO-360-B1B, IO-320-B1A and 86 more. Effective Jul 10, 1964 - [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 - [AD 63-14-03](https://openairdocs.org/ad/63-14-03): Oil Pump Drive Shaft · Lycoming Engines IO-540-A1A5, IO-540-B1A5, IO-540-B1B5 and 21 more. Effective Jul 6, 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 (18) - [N142KW](https://openairdocs.org/aircraft/N142KW): [Phillips John C](https://openairdocs.org/faa-owner/PHILLIPS%20JOHN%20C), [Moneta, VA](https://openairdocs.org/faa-place/VA/Moneta), built 2019, S/N 40610 - [N25SR](https://openairdocs.org/aircraft/N25SR): [Wood Richard Allen](https://openairdocs.org/faa-owner/WOOD%20RICHARD%20ALLEN), [Inkom, ID](https://openairdocs.org/faa-place/ID/Inkom), built 2017, S/N 093SR - [N2957](https://openairdocs.org/aircraft/N2957): [Marrero Edgardo](https://openairdocs.org/faa-owner/MARRERO%20EDGARDO), [Enterprise, AL](https://openairdocs.org/faa-place/AL/Enterprise), built 1971, S/N 402 - [N318DS](https://openairdocs.org/aircraft/N318DS): [Strodtbeck Dale G](https://openairdocs.org/faa-owner/STRODTBECK%20DALE%20G), [Eureka, MT](https://openairdocs.org/faa-place/MT/Eureka), built 2025, S/N 40624 - [N3632P](https://openairdocs.org/aircraft/N3632P): [Aerospace Trust Management LLC Trustee](https://openairdocs.org/faa-owner/AEROSPACE%20TRUST%20MANAGEMENT%20LLC%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1969, S/N 24-3632 - [N3LM](https://openairdocs.org/aircraft/N3LM): [Manary Lowell A](https://openairdocs.org/faa-owner/MANARY%20LOWELL%20A), [Montrose, CO](https://openairdocs.org/faa-place/CO/Montrose), built 2019, S/N 1 - [N45888](https://openairdocs.org/aircraft/N45888): [D-Five Holdings Group LLC](https://openairdocs.org/faa-owner/D-FIVE%20HOLDINGS%20GROUP%20LLC), [Vidor, TX](https://openairdocs.org/faa-place/TX/Vidor), built 1963, S/N 24-3453 - [N4724P](https://openairdocs.org/aircraft/N4724P): [Tnt Farms](https://openairdocs.org/faa-owner/TNT%20FARMS), [Marana, AZ](https://openairdocs.org/faa-place/AZ/Marana), S/N 27-252 - [N476CF](https://openairdocs.org/aircraft/N476CF): [Halderman Floyd G Jr](https://openairdocs.org/faa-owner/HALDERMAN%20FLOYD%20G%20JR), [Eldon, MO](https://openairdocs.org/faa-place/MO/Eldon), built 2025, S/N 41715 - [N510DD](https://openairdocs.org/aircraft/N510DD): [Schardt Donovan D](https://openairdocs.org/faa-owner/SCHARDT%20DONOVAN%20D), [Juniata, NE](https://openairdocs.org/faa-place/NE/Juniata), built 2011, S/N 40099 - [N548JH](https://openairdocs.org/aircraft/N548JH): [Hagg Jeffrey D](https://openairdocs.org/faa-owner/HAGG%20JEFFREY%20D), [Indianapolis, IN](https://openairdocs.org/faa-place/IN/Indianapolis), built 2007, S/N 54806 - [N556G](https://openairdocs.org/aircraft/N556G): [Gooch Joel L](https://openairdocs.org/faa-owner/GOOCH%20JOEL%20L), [Sumter, SC](https://openairdocs.org/faa-place/SC/Sumter), built 2012, S/N 40931 - [N6530Z](https://openairdocs.org/aircraft/N6530Z): [Elk Mountain Soaring LLC](https://openairdocs.org/faa-owner/ELK%20MOUNTAIN%20SOARING%20LLC), [Bountiful, UT](https://openairdocs.org/faa-place/UT/Bountiful), built 1962, S/N 25-2063 - [N6995P](https://openairdocs.org/aircraft/N6995P): [International Air Services Inc Trustee](https://openairdocs.org/faa-owner/INTERNATIONAL%20AIR%20SERVICES%20INC%20TRUSTEE), [Carson City, NV](https://openairdocs.org/faa-place/NV/Carson%20City), built 1960, S/N PA-24-2138 - [N787KS](https://openairdocs.org/aircraft/N787KS): [Walden Franklin S](https://openairdocs.org/faa-owner/WALDEN%20FRANKLIN%20S), [Southern Pines, NC](https://openairdocs.org/faa-place/NC/Southern%20Pines), built 1964, S/N 24-3644 - [N820TX](https://openairdocs.org/aircraft/N820TX): [Walker Ronald J](https://openairdocs.org/faa-owner/WALKER%20RONALD%20J), [Cedar Park, TX](https://openairdocs.org/faa-place/TX/Cedar%20Park), built 2016, S/N 40427 - [N828CB](https://openairdocs.org/aircraft/N828CB): [Stokes Robert J Jr](https://openairdocs.org/faa-owner/STOKES%20ROBERT%20J%20JR), [Queen Creek, AZ](https://openairdocs.org/faa-place/AZ/Queen%20Creek), built 2018, S/N 132-257/258-1175 - [N837EL](https://openairdocs.org/aircraft/N837EL): [Hewitt Vehicles LLC](https://openairdocs.org/faa-owner/HEWITT%20VEHICLES%20LLC), [Oakford, IN](https://openairdocs.org/faa-place/IN/Oakford), built 2026, S/N 42036 ## NTSB investigations (3) 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 ERA16LA139](https://openairdocs.org/ntsb/ERA16LA139), Mar 24, 2016: Hall, Wendall W Harmon Rocket II (N729PS), Cheraw, SC, substantial damage, 1 fatal. Probable cause: The pilot's decision to fly at low altitude, which resulted in a collision with power lines. - [NTSB CEN11FA537](https://openairdocs.org/ntsb/CEN11FA537), Jul 31, 2011: Morrison E-RACER (N345JM), Big Rock, IL, destroyed, 1 fatal. Probable cause: The pilot's failure to maintain airplane control after experiencing excessive engine cylinder head temperatures during the initial flight test of the experimental amateur-built airplane. - [NTSB SEA73FTI22](https://openairdocs.org/ntsb/SEA73FTI22), Jun 22, 1973: Piper PA-25 (N6530Z), Belgrade, MT, substantial damage ## FAA accident and incident reports (3) 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 20160324002599A](https://openairdocs.org/incident/20160324002599A), Mar 24, 2016: Wendall Hall ROCKET II (N729PS), Cheraw, SC, Destroyed, 1 fatal. On March 24, 2016, about 0750 eastern daylight time, an experimental amateur-built harmon Rocket II, N729PS, was substantially damaged when it impacted terrain… - [Accident 20110731018279A](https://openairdocs.org/incident/20110731018279A), Jul 31, 2011: Morrison John K E-RACER (N345JM), Big Rock, IL, Destroyed, 1 fatal. Shortly after departure from the aurora airport (arr) in sugar grove Illinois. The pilot reported high cylinder head temperature and wanted to return to the… - [Accident 19730622016969A](https://openairdocs.org/incident/19730622016969A), Jun 22, 1973: Piper PA25235 (N6530Z), Belgrade, MT, Substantial damage. Den alt 7000FT. 128LBS ovr gross wt. Acft passed thru corral strikng fence. ## Service difficulty reports (28) As reported by operators and repair stations, by the model named in the report. - [SDR CA160304006](https://openairdocs.org/sdr/CA160304006), Mar 3, 2016: CARBURETOR. CONTAMINATED. (CAN) CARBURETOR WAS TESTED WITH NO FAULTS WERE FOUND. THE FUEL LEVEL IN THE FLOAT BOWL WAS NORMAL WITH NO LEAKS. SOME MATERIAL WAS FOUND IN THE INLET SCREEN BU - [SDR CA160229007](https://openairdocs.org/sdr/CA160229007), Feb 24, 2016: CARBURETOR. FAILED. (CAN) ON APPROACH, THE PILOT REDUCED POWER WHILE TURNING BASE AND NOTICED THE ENGINE STARTED TO RUN ROUGH, SHE CONTINUED THE APPROACH AND UPON LANDING NOTICED T - [SDR CA160114002](https://openairdocs.org/sdr/CA160114002), Nov 30, 2015: CONTACT. DEFORMED. (CAN) LEFT ENGINE WOULD NOT START. TROUBLESHOOTING REVEALED WEAK OCCASIONAL SPARK TO SPARK PLUGS FROM LT MAGNETO. INSPECTION OF MAGNETO REVEALED RETARD CONTACT - [SDR 2011FA0000491](https://openairdocs.org/sdr/2011FA0000491), Jul 21, 2011: VALVE SEAT. DAMAGED. ACFT OWNER STATED; PROP DOES NOT WORK CORRECTLY AND WITH ENGINE OVERSPEED, PROP AND GOVERNOR INSTALLED NEW 1-15-98. BENCH CHECK GOVERNOR, FOUND ONLY 80 LBS PRES - [SDR CA091109003](https://openairdocs.org/sdr/CA091109003), Nov 9, 2009: STRUCTURE. CRACKED. (CAN) AN INSP WAS CARRIED OUT ON THE STABILATOR HORN DUE TO REPORTS OF CRACKING ON OTHER ACFT. NO CRACKS WERE VISIBLE FROM THE OUTSIDE, AND IT WAS NECESSARY TO - [SDR CA091117001](https://openairdocs.org/sdr/CA091117001), Nov 8, 2009: CONDUIT. WORN. (CAN) RT MAIN RETACTION PUSH PULL CONDUIT AT LANDING GEAR END WAS WORN BETWEEN INNER AND OUTER SLEEVES. SEPARATION OF THE SLEEVES DID NOT ALLOW THE GEAR TO EXTE - [SDR 2007FA0000627](https://openairdocs.org/sdr/2007FA0000627), Jun 6, 2007: CONDUIT. SEPARATED. RT MLG EXTEND/RETRACT CONDUIT PUSH-PULL TUBING SEPARATED AT THE SWEDGE CONNECTION JUST OB OF THE LANDING GEAR CONTROL SUPPORT BRACKET. THERE WERE NO INDICATIONS - [SDR AU510002132](https://openairdocs.org/sdr/AU510002132), Dec 12, 2005: RIVET. MISSING. WING REAR SPAR ATTACHMENT PLATE RIVETS (7OFF) MISSING. INVESTIGATION CONTINUING. - [SDR AU510002000](https://openairdocs.org/sdr/AU510002000), May 10, 2005: CYLINDER. CRACKED. ENGINE CYLINDERS (2OFF) CRACKED IN CYLINDER HEAD AREA. - [SDR CA050506005](https://openairdocs.org/sdr/CA050506005), Apr 22, 2005: PUSH-PULL CABLE. BROKEN. (CAN) AFTER EMERGENCY GEAR EXTENSION IN FLIGHT AND UNEVENTFUL LANDINGS. UNDER CARRIAGE COLLAPSED ON SUBSEQUENT TAXI. GEAR WAS EXTENDED, PUT ON JACKS LT MAIN UND - [SDR 2004FA0000065](https://openairdocs.org/sdr/2004FA0000065), Dec 4, 2003: CONTROL CABLE. MISROUTED. MIXTURE CONTROL CABLE SECURED AND/OR ROUTED INCORRECTLY WHEN MIXTURE CONTROL CABLE WAS REPLACED AND/OR LUBED. WHEN THE CABLE CAME IN CONTACT WITH NOSE GEAR EXTE - [SDR AUS20030697](https://openairdocs.org/sdr/AUS20030697), Jun 16, 2003: PISTON. CRACKED. (AUS) PISTON CRACKED THROUGH OIL RING LAND. - [SDR AUS20020942](https://openairdocs.org/sdr/AUS20020942), Jul 22, 2002: BOLT. LOOSE. (AUS) ENGINE CRANKSHAFT GEAR RETAINING BOLT LOOSE. THE BOLT HEAD WASWORN DOWN FROM RUBBING ON THE INSIDE OF THE OIL PUMP DRIVESHAFT.THE CRANKSHAFT GEAR ROTATED - [SDR AUS20011117](https://openairdocs.org/sdr/AUS20011117), Sep 25, 2001: GEAR. FAILED. (AUS) MAGNETO TIMING GEAR DRIVESHAFT FAILED. - [SDR AUS20010579](https://openairdocs.org/sdr/AUS20010579), Jun 4, 2001: DISTRIBUTOR. FAULTY. (AUS) MAGNETO DISTRIBUTOR BLOCK CENTRAL BUSH LOOSE ALLOWING THE DISTRIBUTOR GEAR TO PARTIALLY DISENGAGE AND SHEAR THE TEETH. - [SDR 2002FA0000043](https://openairdocs.org/sdr/2002FA0000043), Apr 18, 2001: ENGINE. FAILED. ENGINE ACTED AS THOUGH CARBURETOR ICE WAS BEING CLEARED WITH CARBURETOR HEAT ON. LANDED UNEVENTFULLY. AT TOUCHDOWN, COULD HEAR A LOUD SQUEAK. AT ENGINE SHUT DOW - [SDR CA001020012](https://openairdocs.org/sdr/CA001020012), Aug 30, 2000: SWITCH. BROKEN. (CAN) PILOT PHONE A.M.E., SAYS HE HAS NO MAG DROP ON ONE MAG. ASKED IF HE DID A LIVE/DEAD MAGS CHECK AT LAST SHUTDOWN, HE SAID HE FORGOT EVEN AFTER HE WAS REMIN - [SDR CA990715019](https://openairdocs.org/sdr/CA990715019), Jul 5, 1999: EXHAUST STACK. SEPARATED. (CAN) EXHAUST STACK TOTALLY SEPARATED INSIDE CARBURETOR HEAT SHROUD. VISIBLE SIGNS OF PROLONGED FAILURE. - [SDR CA990715020](https://openairdocs.org/sdr/CA990715020), Jul 5, 1999: ALTERNATOR. LOOSE. (CAN) ALTERNATOR BRACKET NOT CERTIFIED FOR AVIATION APPLICATION (BOGUS PARTS). ALTERNATOR INSTALLED 55 AMP. SPECS CALL FOR 70 AMP. FORWARDED TO M&M FOR CORRECTI - [SDR AU990430039](https://openairdocs.org/sdr/AU990430039), Apr 23, 1999: BEARING. CORRODED. (AU) PROPELLER RECEIVED FOR CORROSION INSPECTION. THE PROPELLER BLADE BEARINGS WERE FOUND CORRODED. - [SDR 99ZZZX1014](https://openairdocs.org/sdr/99ZZZX1014), Feb 5, 1999: PUMP. FAILED. ARM ON FUEL PUMP FAILED IN LESS THAN 2 MINUTES OF OPERATION. 'BROKE THROUGH PIVOT HOLE IN ARM DROPPED INTO ACCESSORY CASE'. INFO LETTER FROM REPAIR STATION STAT - [SDR AU981554](https://openairdocs.org/sdr/AU981554), Nov 24, 1998: BEARING. FAILED. (AUS) LEFT MAGNETO BEARING FAILED. METAL CONTAMINATION OF ENGINE OIL SYSTEM. - [SDR AU981293](https://openairdocs.org/sdr/AU981293), Oct 5, 1998: ENGINE. FAILED. (AUS) ENGINE FAILED. INVESTIGATION FOUND OIL FILTER CONTAMINATED WITH METAL PARTICLES. - [SDR CA980623003](https://openairdocs.org/sdr/CA980623003), Jun 5, 1998: BLADE. CORRODED. (CAN) PROPELLER RECEIVED FOR CORROSION INSPECTION AND COMPLIANCE WITH AD 97-18-02. INSPECTION FOUND ONE BLADE; ONE CLAMP AND TWO BLADE BEARINGS WERE ALL UNSERVI - [SDR AU980504](https://openairdocs.org/sdr/AU980504), May 4, 1998: IMPULSE COUPLING. FAILED. (AUS) MAGNETO IMPULSE COUPLING PAWL RETAINING RIVETS LOOSE AND CLOSE TO FAILURE. - [SDR AU980503](https://openairdocs.org/sdr/AU980503), Apr 6, 1998: IMPULSE COUPLING. FAILED. (AUS) MAGNETO IMPULSE COUPLING PAWL RIVETS LOOSE AND CLOSE TO FAILURE. MAGNETO DRIVE SUPPORT BEARING CAGE BREAKING UP. METAL FOUND IN OIL FILTER. - [SDR AU960607](https://openairdocs.org/sdr/AU960607), Apr 29, 1996: STUD. CRACKED. (AUS) MAIN LANDING GEAR SIDE BRACE STUD CRACKED - FOUND DURING MAGNETIC PARTICLE INSPECTION IAW AD/PA24/44 - [SDR 95ZZZX589](https://openairdocs.org/sdr/95ZZZX589), Jan 19, 1995: DISTRIBUTOR BLK. FAILED. CENTER BUSHING IN THE DISTRIBUTOR BLOCK CAME LOOSE WHERE IT WAS CAST INTO THE BLOCK MATERIAL ALLOWING DISTRIBUTOR GEAR TO SHIFT AWAY FROM THE DRIVE GEAR CAUSING ## STCs that may be installed (OpenAirDocs) (46) 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 SE40WE](https://openairdocs.org/stc/SE40WE): Installation of two Roto-Master Turbochargers Model No. 3DT5FF10J2, P/N 600572-00 (formerly Rayjay Model No. 315F10 P/N RJ0080-100, -101, or - 102). TALCO Aviation - [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 SE01537AT](https://openairdocs.org/stc/SE01537AT): Replace counterweights on Lycoming O-540-A1A5, -A1B5, -A1C5, -A1D5, and IO-540-C1B5 engines. Whelen Aerospace Technologies - [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 SE5869SW](https://openairdocs.org/stc/SE5869SW): Install turbosupercharger. Desert Wind Air Service - [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 SE922GL](https://openairdocs.org/stc/SE922GL): Installation of a Shadin Company fuel flow transducer. Shadin Avionics - [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 SE17WE](https://openairdocs.org/stc/SE17WE): Installation of AiResearch Turbosupercharger 406330. GE Engine Services-Corporate Aviation Inc. DBA Garrett Aviation Services - [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 SE318NE](https://openairdocs.org/stc/SE318NE): Installation of 'auto-vac-2' auxiliary instrument vacuum system. Raymond Ives - [STC SE3552NM](https://openairdocs.org/stc/SE3552NM): Modification of crankshaft damper configuration. Johnston Aircraft Svc, Inc - [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 - [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 - [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 - [ES3823](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID146282172620251216184219.0001): Dist. Block & Gear Assy.. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces K3823 · May 20, 2024 - [ES3331](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID142668191320251216184207.0001): Oil Seal. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3331 · May 20, 2024 - [ES3828](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID141865244620251216184221.0001): Rotor Gear. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces K3828 · May 20, 2024 - [AM-3020](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID134367835920251216184146.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3020 · May 20, 2024 - [ES1077](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID132381862220251216184212.0001): Air Vent. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M1077 · May 20, 2024 - [AM3611](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125128266220251216184158.0001): Cam. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3611, M1522 · May 20, 2024 - [ES3826](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID112237278720251216184206.0001): Spacer. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3826 · May 20, 2024 - [ES3630](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID108310017320251216184222.0001): Bearing Cap, Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3630, K3630 · May 20, 2024 - [A-13081K](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID103306043420251216184147.0001): Contact Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3081 · May 20, 2024 - [ES3019](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100047104220251216184208.0001): Nut. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3019 · May 20, 2024 - [AB-382585](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID195988018720251216184453.0001): Ignition ContactAssembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental10-382585 · Dec 8, 2023 - [AB-157160](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID193485923720251216184437.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental 10-157160 · Dec 8, 2023 - [AB-400623](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID193069304920251216184444.0001): Ball Bearing. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental… · Dec 8, 2023 - [AB-51678](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID192819677720251216184507.0001): Oil Deflector. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental10-51678 · Dec 8, 2023 - [ES10-35936-7](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID191691087420251216184428.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental 10-35936-7 · Dec 8, 2023 - [AB-357586](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID182632077520251216184446.0001): Gear. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental 10-357586 · Dec 8, 2023 - [ES10-35937-8](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID181846469020251216184431.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental10-35937-8 · Dec 8, 2023 - [ES10-35935-6](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID180932652920251216184430.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces Continental 10-35935-6 · Dec 8, 2023 All of them: https://openairdocs.org/engine/lycoming-o-540-a1d5/pma.md --- 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.