# Lycoming IO-540-AE1A5

- Type: Engine model (FAA registry)
- Registry code: 41899
- Manufacturer (registry): LYCOMING
- Model: IO-540-AE1A5
- Engine type: Reciprocating
- Power: 260 hp
- Data sheet: [TCDS 1E4](https://openairdocs.org/tcds/1E4) (OpenAirDocs)
- Holder: Lycoming Engines
- Installed in: 1,040 registered aircraft
- Page: https://openairdocs.org/engine/lycoming-io-540-ae1a5

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 2015-19-07](https://openairdocs.org/ad/2015-19-07): Fuel injector fuel lines · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1B and 187 more. Effective Nov 3, 2015
- [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 2012-03-06](https://openairdocs.org/ad/2012-03-06): Fuel servo diaphragm · Continental Motors 6-260-A, 6-285-A, 6-285-B and 482 more. Effective Feb 24, 2012
- [AD 2009-02-03](https://openairdocs.org/ad/2009-02-03): Fuel injection servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 261 more. Effective Feb 9, 2009
- [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 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 2003-14-03](https://openairdocs.org/ad/2003-14-03): Rotary fuel pumps · Lycoming Engines AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5 and 262 more. Effective Aug 14, 2003
- [AD 2002-19-03](https://openairdocs.org/ad/2002-19-03): Crankshaft · Lycoming Engines IO-540-A1A5, IO-540-AA1A5, IO-540-AA1B5 and 81 more. Effective Sep 20, 2002
- [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 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

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 2011-26-04](https://openairdocs.org/ad/2011-26-04) (historical): Externally mounted fuel injector fuel lines · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1B and 186 more. Effective Jan 25, 2012
- [AD 2011-15-10](https://openairdocs.org/ad/2011-15-10) (historical): Fuel servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 256 more. Effective Aug 16, 2011
- [AD 2008-14-07](https://openairdocs.org/ad/2008-14-07) (historical): Externally mounted fuel injector fuel lines · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1B and 185 more. Effective Aug 14, 2008
- [AD 2008-08-14](https://openairdocs.org/ad/2008-08-14) (historical): Fuel injection servo plugs · Superior Air Parts AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 242 more. Effective Apr 29, 2008
- [AD 2008-06-51](https://openairdocs.org/ad/2008-06-51) (historical): Fuel injection servo plugs · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 235 more
- [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

## Information bulletins (advisory) (7)

- [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-09-04](https://openairdocs.org/saib/NE-09-04): Fuel Control/Reciprocating Engines. Issued Jan 10, 2009
- [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 (1,040, first 50)

- [N1004T](https://openairdocs.org/aircraft/N1004T): [I1 Aviation LLC](https://openairdocs.org/faa-owner/I1%20AVIATION%20LLC), [Ronkonkoma, NY](https://openairdocs.org/faa-place/NY/Ronkonkoma), built 2010, S/N 13012
- [N101GD](https://openairdocs.org/aircraft/N101GD): [101 Gd Corp](https://openairdocs.org/faa-owner/101%20GD%20CORP), [Miami, FL](https://openairdocs.org/faa-place/FL/Miami), built 2021, S/N 14434
- [N101SU](https://openairdocs.org/aircraft/N101SU): [Southern Utah University](https://openairdocs.org/faa-owner/SOUTHERN%20UTAH%20UNIVERSITY), [Cedar City, UT](https://openairdocs.org/faa-place/UT/Cedar%20City), built 2024, S/N 14728
- [N104TE](https://openairdocs.org/aircraft/N104TE): [N104te LLC](https://openairdocs.org/faa-owner/N104TE%20LLC), [Tucumcari, NM](https://openairdocs.org/faa-place/NM/Tucumcari), built 2011, S/N 13093
- [N106FC](https://openairdocs.org/aircraft/N106FC): [Folden Holdlings LLC](https://openairdocs.org/faa-owner/FOLDEN%20HOLDLINGS%20LLC), [Jonesboro, AR](https://openairdocs.org/faa-place/AR/Jonesboro), built 2012, S/N 13399
- [N1086B](https://openairdocs.org/aircraft/N1086B): [State Of Alaska](https://openairdocs.org/faa-owner/STATE%20OF%20ALASKA), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 2024, S/N 14698
- [N108AF](https://openairdocs.org/aircraft/N108AF): [Rideout Melvin B Jr](https://openairdocs.org/faa-owner/RIDEOUT%20MELVIN%20B%20JR), [Jarratt, VA](https://openairdocs.org/faa-place/VA/Jarratt), built 2005, S/N 10948
- [N108EH](https://openairdocs.org/aircraft/N108EH): [Polar Star Corp](https://openairdocs.org/faa-owner/POLAR%20STAR%20CORP), [Kalispell, MT](https://openairdocs.org/faa-place/MT/Kalispell), built 2005, S/N 10951
- [N1092C](https://openairdocs.org/aircraft/N1092C): [State Of Alaska Department Of Public Safety](https://openairdocs.org/faa-owner/STATE%20OF%20ALASKA%20DEPARTMENT%20OF%20PUBLIC%20SAFETY), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 2023, S/N 14687
- [N109MC](https://openairdocs.org/aircraft/N109MC): [Crouch Lynn DBA](https://openairdocs.org/faa-owner/CROUCH%20LYNN%20DBA), [White House, TN](https://openairdocs.org/faa-place/TN/White%20House), built 2006, S/N 11342
- [N10AF](https://openairdocs.org/aircraft/N10AF): [Hambelton Robert](https://openairdocs.org/faa-owner/HAMBELTON%20ROBERT), [Klamath Falls, OR](https://openairdocs.org/faa-place/OR/Klamath%20Falls), built 2006, S/N 11079
- [N10QH](https://openairdocs.org/aircraft/N10QH): [Comanche Maverick Air LLC](https://openairdocs.org/faa-owner/COMANCHE%20MAVERICK%20AIR%20LLC), [Houston, TX](https://openairdocs.org/faa-place/TX/Houston), built 2016, S/N 13990
- [N10UP](https://openairdocs.org/aircraft/N10UP): [Leonards Dream LLC](https://openairdocs.org/faa-owner/LEONARDS%20DREAM%20LLC), [Kent, OH](https://openairdocs.org/faa-place/OH/Kent), built 2019, S/N 14330
- [N111PA](https://openairdocs.org/aircraft/N111PA): [Wpp Nautical LLC](https://openairdocs.org/faa-owner/WPP%20NAUTICAL%20LLC), [Helena, MT](https://openairdocs.org/faa-place/MT/Helena), built 2006, S/N 11276
- [N112WF](https://openairdocs.org/aircraft/N112WF): [Whiskey Fox LLC](https://openairdocs.org/faa-owner/WHISKEY%20FOX%20LLC), [Kirkland, WA](https://openairdocs.org/faa-place/WA/Kirkland), built 2008, S/N 12486
- [N115PS](https://openairdocs.org/aircraft/N115PS): [Ag Farmacy Applications LLC](https://openairdocs.org/faa-owner/AG%20FARMACY%20APPLICATIONS%20LLC), [Erie, IL](https://openairdocs.org/faa-place/IL/Erie), built 2007, S/N 12047
- [N115RH](https://openairdocs.org/aircraft/N115RH): [Regional Helicopters LLC](https://openairdocs.org/faa-owner/REGIONAL%20HELICOPTERS%20LLC), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 2013, S/N 13470
- [N117LE](https://openairdocs.org/aircraft/N117LE): [Leading Edge Aviation Inc](https://openairdocs.org/faa-owner/LEADING%20EDGE%20AVIATION%20INC), [Bend, OR](https://openairdocs.org/faa-place/OR/Bend), built 2007, S/N 11714
- [N1189](https://openairdocs.org/aircraft/N1189): [Aeroluxe Aviation LLC](https://openairdocs.org/faa-owner/AEROLUXE%20AVIATION%20LLC), [Nashville, TN](https://openairdocs.org/faa-place/TN/Nashville), built 2014, S/N 13711
- [N119MJ](https://openairdocs.org/aircraft/N119MJ): [N119mj LLC](https://openairdocs.org/faa-owner/N119MJ%20LLC), [Honolulu, HI](https://openairdocs.org/faa-place/HI/Honolulu), built 2013, S/N 13406
- [N11HN](https://openairdocs.org/aircraft/N11HN): [Vstol Aviation LLC](https://openairdocs.org/faa-owner/VSTOL%20AVIATION%20LLC), [Houston, TX](https://openairdocs.org/faa-place/TX/Houston), built 2016, S/N 14040
- [N120AB](https://openairdocs.org/aircraft/N120AB): [Hawaii Pacific Aviation Inc](https://openairdocs.org/faa-owner/HAWAII%20PACIFIC%20AVIATION%20INC), [Kailua Kona, HI](https://openairdocs.org/faa-place/HI/Kailua%20Kona), built 2005, S/N 10868
- [N1212N](https://openairdocs.org/aircraft/N1212N): [Hgh Holdings LLC](https://openairdocs.org/faa-owner/HGH%20HOLDINGS%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2024, S/N 14800
- [N121ME](https://openairdocs.org/aircraft/N121ME): [Evergreen Empire LLC](https://openairdocs.org/faa-owner/EVERGREEN%20EMPIRE%20LLC), [Delano, CA](https://openairdocs.org/faa-place/CA/Delano), built 2007, S/N 11797
- [N121RH](https://openairdocs.org/aircraft/N121RH): [Helirod LLC](https://openairdocs.org/faa-owner/HELIROD%20LLC), [Oro Valley, AZ](https://openairdocs.org/faa-place/AZ/Oro%20Valley), built 2023, S/N 14615
- [N121TV](https://openairdocs.org/aircraft/N121TV): [Sky Helicopters Inc](https://openairdocs.org/faa-owner/SKY%20HELICOPTERS%20INC), [Eustace, TX](https://openairdocs.org/faa-place/TX/Eustace), built 2012, S/N 13214
- [N123MP](https://openairdocs.org/aircraft/N123MP): [Prairie River Farm Inc](https://openairdocs.org/faa-owner/PRAIRIE%20RIVER%20FARM%20INC), [Watertown, SD](https://openairdocs.org/faa-place/SD/Watertown), built 2010, S/N 12796
- [N123SU](https://openairdocs.org/aircraft/N123SU): [Southern Utah University](https://openairdocs.org/faa-owner/SOUTHERN%20UTAH%20UNIVERSITY), [Cedar City, UT](https://openairdocs.org/faa-place/UT/Cedar%20City), built 2024, S/N 14727
- [N1253P](https://openairdocs.org/aircraft/N1253P): [Maco Aviation Inc](https://openairdocs.org/faa-owner/MACO%20AVIATION%20INC), [Dayton, WA](https://openairdocs.org/faa-place/WA/Dayton), built 2007, S/N 11715
- [N125WF](https://openairdocs.org/aircraft/N125WF): [Southern Aircraft Consultancy Inc Trustee](https://openairdocs.org/faa-owner/SOUTHERN%20AIRCRAFT%20CONSULTANCY%20INC%20TRUSTEE), [Casper, WY](https://openairdocs.org/faa-place/WY/Casper), built 2004, S/N 10445
- [N126SK](https://openairdocs.org/aircraft/N126SK): [Soky Helicopters LLC](https://openairdocs.org/faa-owner/SOKY%20HELICOPTERS%20LLC), [Bowling Green, KY](https://openairdocs.org/faa-place/KY/Bowling%20Green), built 2008, S/N 12382
- [N1273](https://openairdocs.org/aircraft/N1273): [Taf Investments LLC](https://openairdocs.org/faa-owner/TAF%20INVESTMENTS%20LLC), [Doraville, GA](https://openairdocs.org/faa-place/GA/Doraville), built 2021, S/N 14489
- [N1282S](https://openairdocs.org/aircraft/N1282S): [Scharfenberg Andrea](https://openairdocs.org/faa-owner/SCHARFENBERG%20ANDREA), [Maquon, IL](https://openairdocs.org/faa-place/IL/Maquon), built 2014, S/N 13618
- [N128AF](https://openairdocs.org/aircraft/N128AF): [Summerskyz Inc](https://openairdocs.org/faa-owner/SUMMERSKYZ%20INC), [Saint Joseph, IL](https://openairdocs.org/faa-place/IL/Saint%20Joseph), built 2006, S/N 11475
- [N129ES](https://openairdocs.org/aircraft/N129ES): [Whirlybird Aviation LLC](https://openairdocs.org/faa-owner/WHIRLYBIRD%20AVIATION%20LLC), [Naples, ID](https://openairdocs.org/faa-place/ID/Naples), built 2008, S/N 12173
- [N12RH](https://openairdocs.org/aircraft/N12RH): [Lead Aviation Fl1 LLC](https://openairdocs.org/faa-owner/LEAD%20AVIATION%20FL1%20LLC), [Osprey, FL](https://openairdocs.org/faa-place/FL/Osprey), built 2015, S/N 13842
- [N130SK](https://openairdocs.org/aircraft/N130SK): [City Of Lakewood](https://openairdocs.org/faa-owner/CITY%20OF%20LAKEWOOD), [Lakewood, CA](https://openairdocs.org/faa-place/CA/Lakewood), built 2007, S/N 11781
- [N1329T](https://openairdocs.org/aircraft/N1329T): [Piper Electric Inc](https://openairdocs.org/faa-owner/PIPER%20ELECTRIC%20INC), [Deer Park, NY](https://openairdocs.org/faa-place/NY/Deer%20Park), built 2024, S/N 14753
- [N133AA](https://openairdocs.org/aircraft/N133AA): [133aa LLC](https://openairdocs.org/faa-owner/133AA%20LLC), [Muskogee, OK](https://openairdocs.org/faa-place/OK/Muskogee), built 2007, S/N 11666
- [N133MB](https://openairdocs.org/aircraft/N133MB): [Hover Holdings LLC](https://openairdocs.org/faa-owner/HOVER%20HOLDINGS%20LLC), [Coral Gables, FL](https://openairdocs.org/faa-place/FL/Coral%20Gables), built 2019, S/N 14369
- [N134CM](https://openairdocs.org/aircraft/N134CM): [Lone Star Helicopter Inc](https://openairdocs.org/faa-owner/LONE%20STAR%20HELICOPTER%20INC), [Lago Vista, TX](https://openairdocs.org/faa-place/TX/Lago%20Vista), built 2023, S/N 14618
- [N134DL](https://openairdocs.org/aircraft/N134DL): [Over And Under Flying Service Inc DBA](https://openairdocs.org/faa-owner/OVER%20AND%20UNDER%20FLYING%20SERVICE%20INC%20DBA), [Knox, IN](https://openairdocs.org/faa-place/IN/Knox), built 2010, S/N 13014
- [N135KT](https://openairdocs.org/aircraft/N135KT): [Mission Destiny Helicopter LLC](https://openairdocs.org/faa-owner/MISSION%20DESTINY%20HELICOPTER%20LLC), [Red Lion, PA](https://openairdocs.org/faa-place/PA/Red%20Lion), built 2013, S/N 13469
- [N1413X](https://openairdocs.org/aircraft/N1413X): [Driftless Helicopters LLC](https://openairdocs.org/faa-owner/DRIFTLESS%20HELICOPTERS%20LLC), [Galena, IL](https://openairdocs.org/faa-place/IL/Galena), built 2008, S/N 12157
- [N141AH](https://openairdocs.org/aircraft/N141AH): [Atlantic Aviation International Inc](https://openairdocs.org/faa-owner/ATLANTIC%20AVIATION%20INTERNATIONAL%20INC), [Lewes, DE](https://openairdocs.org/faa-place/DE/Lewes), built 2004, S/N 10448
- [N141CE](https://openairdocs.org/aircraft/N141CE): [Ice Holdings LLC](https://openairdocs.org/faa-owner/ICE%20HOLDINGS%20LLC), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 2025, S/N 14921
- [N141LS](https://openairdocs.org/aircraft/N141LS): [Mthh Management](https://openairdocs.org/faa-owner/MTHH%20MANAGEMENT), [Hamilton, MT](https://openairdocs.org/faa-place/MT/Hamilton), built 2008, S/N 12275
- [N1422D](https://openairdocs.org/aircraft/N1422D): [Black Bird Leasing LLC](https://openairdocs.org/faa-owner/BLACK%20BIRD%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2006, S/N 11450
- [N142AV](https://openairdocs.org/aircraft/N142AV): [Straight Up Leasing Inc](https://openairdocs.org/faa-owner/STRAIGHT%20UP%20LEASING%20INC), [Medford, OR](https://openairdocs.org/faa-place/OR/Medford), built 2024, S/N 14776
- [N143VA](https://openairdocs.org/aircraft/N143VA): [Kaman Arms LLC](https://openairdocs.org/faa-owner/KAMAN%20ARMS%20LLC), [Paron, AR](https://openairdocs.org/faa-place/AR/Paron), built 2009, S/N 12747

All 1,040: https://openairdocs.org/engine/lycoming-io-540-ae1a5/aircraft.md

## NTSB investigations (160, newest 50)

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 ANC26LA103](https://openairdocs.org/ntsb/ANC26LA103), Sep 11, 2026: Robinson Helicopter R44 II (N4026E), Colquitt, GA, substantial damage, investigation ongoing
- [NTSB ANC26LA084](https://openairdocs.org/ntsb/ANC26LA084), Aug 13, 2026: Robinson Helicopter R44 II (N861MP), Anthony, FL, substantial damage, investigation ongoing
- [NTSB CEN26LA276](https://openairdocs.org/ntsb/CEN26LA276), Aug 2, 2026: Robinson Helicopter R44 II (N26KL), Bennett, IA, substantial damage, investigation ongoing
- [NTSB CEN26LA256](https://openairdocs.org/ntsb/CEN26LA256), Jul 16, 2026: Robinson Helicopter R44 II (N322TC), Coralville, IA, substantial damage. Probable cause: The pilot’s failure to maintain clearance from a power line during a low-level aerial application flight.
- [NTSB CEN26LA168](https://openairdocs.org/ntsb/CEN26LA168), Apr 17, 2026: Robinson Helicopter R44 (N445JS), Mount Blanco, TX, substantial damage. Probable cause: The pilot’s failure to maintain proper main rotor rpm during a low-level turn, which resulted in the main rotor rpm drooping, a loss of control at an altitude too low for recovery, and a subsequent…
- [NTSB WPR26LA083](https://openairdocs.org/ntsb/WPR26LA083), Jan 19, 2026: Robinson R44 (N996NR), Parkman, WY, substantial damage. Probable cause: The pilots’ failure to maintain separation while conducting air work in a common operational area. Contributing to the accident was the pilots’ divided attention associated with the mission activity…
- [NTSB CEN25LA389](https://openairdocs.org/ntsb/CEN25LA389), Sep 19, 2025: Robinson Helicopter R44 (N831VA), Decatur, TX, substantial damage. Probable cause: The pilot’s loss of control during an off-airport, pinnacle landing, and the flight instructor’s inadequate supervision of the instructional flight.
- [NTSB WPR25LA262](https://openairdocs.org/ntsb/WPR25LA262), Aug 18, 2025: Robinson Helicopter R44 II (N877DR), Burlington, WA, substantial damage. Probable cause: The pilot’s failure to see and avoid the light pole, which resulted in a collision with the light pole and subsequent ground impact.
- [NTSB CEN25LA326](https://openairdocs.org/ntsb/CEN25LA326), Aug 16, 2025: Robinson Helicopter R44 II (N24DF), Cape Girardeau, MO, substantial damage, investigation ongoing
- [NTSB WPR25LA239](https://openairdocs.org/ntsb/WPR25LA239), Aug 3, 2025: Robinson Helicopter R44 II (N750GT), Ponderosa Pines, MT, substantial damage. Probable cause: The pilot’s improper pedal application during an approach to a hover.
- [NTSB ERA25LA267](https://openairdocs.org/ntsb/ERA25LA267), Jul 9, 2025: Robinson Helicopter R44 II (N67RW), Inlet, NY, substantial damage. Probable cause: The pilot’s failure to maintain control of the helicopter during the landing.
- [NTSB CEN25LA237](https://openairdocs.org/ntsb/CEN25LA237), Jul 4, 2025: Robinson Helicopter R44 II (N992TP), Pecos, TX, substantial damage. Probable cause: The pilot’s failure to maintain aircraft control during gusty wind conditions.
- [NTSB ANC25LA064](https://openairdocs.org/ntsb/ANC25LA064), Jun 30, 2025: Robinson Helicopter R44 II (N531AT), Palmer, AK, substantial damage. Probable cause: The pilot’s diverted attention during takeoff in flat light conditions, which resulted in a loss of visual reference with terrain.
- [NTSB ERA25LA240](https://openairdocs.org/ntsb/ERA25LA240), Jun 25, 2025: Robinson Helicopter R44 II (N144WK), Hawesville, KY, substantial damage. Probable cause: The pilot’s failure to maintain clearance from power lines during low-level agricultural spray operations.
- [NTSB CEN25FA183](https://openairdocs.org/ntsb/CEN25FA183), May 23, 2025: Robinson Helicopter R44 II (N1195P), Miami, TX, destroyed, 1 fatal, investigation ongoing
- [NTSB WPR25LA110](https://openairdocs.org/ntsb/WPR25LA110), Mar 10, 2025: Robinson Helicopter R44 II (N44KY), Las Vegas, NV, substantial damage. Probable cause: The pilot’s loss of helicopter control after the door opened during takeoff. Contributing to the accident was the pilot’s failure to confirm that the door was properly closed before departure.
- [NTSB CEN25LA116](https://openairdocs.org/ntsb/CEN25LA116), Mar 10, 2025: Robinson Helicopter R44 II (N128AF), Chicago, IL, substantial damage, investigation ongoing
- [NTSB CEN25LA105](https://openairdocs.org/ntsb/CEN25LA105), Feb 27, 2025: Robinson Helicopter R44 II (N6555C), Edgemont, SD, no damage. Probable cause: The pilot’s failure to properly identify the proper anchor point for the supplemental harness and the crew’s incorrect use of the restraint system structure as an anchor point, which resulted in the…
- [NTSB CEN25FA104](https://openairdocs.org/ntsb/CEN25FA104), Feb 27, 2025: Robinson Helicopter R44 (N144SG), Uvalde, TX, substantial damage, 2 fatal, investigation ongoing
- [NTSB WPR25LA034](https://openairdocs.org/ntsb/WPR25LA034), Nov 7, 2024: Robinson Helicopter R44 II (N4361R), Durkee, OR, substantial damage. Probable cause: The pilot's inadequate performance planning, which resulted in insufficient engine power to transition into an out-of-ground-effect hover at a high gross weight.
- [NTSB CEN25FA034](https://openairdocs.org/ntsb/CEN25FA034), Nov 2, 2024: Robinson Helicopter R44 II (N62CD), Iowa, LA, destroyed, 3 fatal, investigation ongoing
- [NTSB ERA24LA393](https://openairdocs.org/ntsb/ERA24LA393), Sep 23, 2024: Robinson Helicopter R44 II (N153LA), Ravenel, SC, substantial damage. Probable cause: The pilot’s failure to maintain clearance from terrain, which resulted in the right skid contacting the ground and a subsequent rollover.
- [NTSB WPR24LA307](https://openairdocs.org/ntsb/WPR24LA307), Sep 15, 2024: Robinson Helicopter R44 II (N233WT), Basin, MT, substantial damage. Probable cause: The pilot’s decision to continue performing a high-performance takeoff in a full throttle and low-rotor-rpm condition, which resulted in a loss of control and subsequent impact with terrain.
- [NTSB ANC24LA079](https://openairdocs.org/ntsb/ANC24LA079), Aug 18, 2024: Robinson Helicopter R44 II (N783AK), Palmer, AK, substantial damage. Probable cause: The pilot's failure to follow the operator’s procedure manual and attempted to land at a remote landing zone in high wind conditions. Contributing factor was the pilot’s decision to not conduct a fly…
- [NTSB WPR24LA241](https://openairdocs.org/ntsb/WPR24LA241), Jul 13, 2024: Robinson Helicopter R44 II (N6960), Herriman, UT, substantial damage. Probable cause: A hard landing following a total loss of engine power due to fuel starvation as a result of the improper idle setting of the helicopter’s engine. Contributing to the loss of engine power was the…
- [NTSB ANC24FA063](https://openairdocs.org/ntsb/ANC24FA063), Jul 11, 2024: Robinson Helicopter R44 (N144KW), Kekaha, HI, substantial damage, 3 fatal. Probable cause: An encounter with turbulence due to downdraft winds that resulted in mast bumping and an in-flight breakup.
- [NTSB CEN24LA252](https://openairdocs.org/ntsb/CEN24LA252), Jul 4, 2024: Robinson Helicopter R44 II (N225AM), New Florence, MO, substantial damage. Probable cause: The pilot’s failure to maintain proper altitude/clearance from a dead tree limb during an aerial application flight.
- [NTSB WPR24FA200](https://openairdocs.org/ntsb/WPR24FA200), Jun 19, 2024: Robinson Helicopter R44 II (N323TT), Bluestem, WA, destroyed, 2 fatal. Probable cause: The pilot’s failure to manage main rotor rpm during an autorotation, which resulted in a loss of helicopter control. Contributing to the accident was a loss of power for reasons that could not be…
- [NTSB ERA24LA236](https://openairdocs.org/ntsb/ERA24LA236), Jun 2, 2024: Robinson R44 (N220SW), Gilbertsville, KY, substantial damage. Probable cause: The pilot's failure to maintain control of the helicopter while attempting to take off from sloping terrain.
- [NTSB ERA24LA171](https://openairdocs.org/ntsb/ERA24LA171), Apr 9, 2024: Robinson Helicopter R44 II (N331EL), South Kingstown, RI, substantial damage. Probable cause: The pilot’s failure to maintain clearance from the water while maneuvering at low altitude.
- [NTSB ERA24LA118](https://openairdocs.org/ntsb/ERA24LA118), Feb 1, 2024: Robinson Helicopter R44 II (N521LS), Miami, FL, substantial damage. Probable cause: Tail rotor contact with an unseen object while performing a precautionary landing to a closed helipad at night.
- [NTSB WPR24LA092](https://openairdocs.org/ntsb/WPR24LA092), Dec 6, 2023: Robinson Helicopter R44 II (N422DX), Calexico, CA, substantial damage. Probable cause: The pilot's failure to maintain clearance from power lines during an aerial application flight.
- [NTSB CEN23LA341](https://openairdocs.org/ntsb/CEN23LA341), Jul 31, 2023: Robinson Helicopter R44 II (N644ME), Arthur, IL, substantial damage. Probable cause: The pilot’s failure to maintain clearance from trees during a low-level aerial application flight.
- [NTSB CEN23LA326](https://openairdocs.org/ntsb/CEN23LA326), Jul 26, 2023: Robinson Helicopter R44 II (N4174L), Charles City, IA, substantial damage. Probable cause: The pilot’s improper preflight of the helicopter to ensure that it was within the loading and performance limitations that resulted in settling and impact with terrain during initial climb.
- [NTSB CEN23LA306](https://openairdocs.org/ntsb/CEN23LA306), Jul 14, 2023: Robinson Helicopter R44 II (N62RK), Pocahontas, IL, substantial damage. Probable cause: A reported loss of engine power for undetermined reasons.
- [NTSB ERA23LA228](https://openairdocs.org/ntsb/ERA23LA228), May 11, 2023: Robinson Helicopter R44 II (N62HT), Bradenton, FL, substantial damage. Probable cause: The pilot’s failure to maintain adequate rotor rpm during landing which resulted in a premature landing on uneven ground and a subsequent rollover.
- [NTSB ANC23LA032](https://openairdocs.org/ntsb/ANC23LA032), May 9, 2023: Robinson Helicopter R44 II (N704T), Skwentna, AK, substantial damage. Probable cause: The pilot's failure to maintain adequate altitude/clearance from terrain while maneuvering in adverse weather conditions, which resulted in a dynamic rollover.
- [NTSB WPR23LA145](https://openairdocs.org/ntsb/WPR23LA145), Apr 1, 2023: Robinson Helicopter R44 II (N462BA), Elko, NV, substantial damage. Probable cause: The pilot’s failure to maintain sufficient altitude and airspeed in gusting tailwind conditions that resulted in an unrecoverable descent and impact with terrain.
- [NTSB CEN23FA142](https://openairdocs.org/ntsb/CEN23FA142), Mar 26, 2023: Robinson Helicopter R44 II (N441PD), Port Allen, LA, destroyed, 2 fatal. Probable cause: The pilot’s decision to continue the visual flight rules flight into deteriorating weather conditions, which resulted in spatial disorientation and the loss of aircraft control.
- [NTSB CEN22LA400](https://openairdocs.org/ntsb/CEN22LA400), Aug 21, 2022: Robinson Helicopter R44 II (N4447A), San Isidro, TX, substantial damage. Probable cause: The pilot’s improper decision to conduct an autorotation with a tailwind, which resulted in a hard landing and substantial damage.
- [NTSB WPR22LA299](https://openairdocs.org/ntsb/WPR22LA299), Aug 11, 2022: Robinson Helicopter R44 II (N987WH), Palmer, AK, substantial damage. Probable cause: The pilot’s failure to maintain lateral control during an off-field landing, which resulted in loss of control and an impact with terrain.
- [NTSB CEN22LA350](https://openairdocs.org/ntsb/CEN22LA350), Jul 31, 2022: Robinson Helicopter R44 II (N458SG), Marshall, MO, substantial damage. Probable cause: The pilot’s failure to adequately survey a field for obstructions prior to a low-level aerial application pass, which resulted in an impact with a powerline.
- [NTSB WPR22LA267](https://openairdocs.org/ntsb/WPR22LA267), Jul 25, 2022: Robinson Helicopter R44 II (N497SU), Cedar City, UT, substantial damage. Probable cause: The student pilot’s failure to maintain rotor rpm and airspeed and the flight instructor's inadequate remedial action to regain helicopter control during the straight-in autorotation which resulted…
- [NTSB CEN22FA288](https://openairdocs.org/ntsb/CEN22FA288), Jun 26, 2022: Robinson Helicopter R44 II (N4124D), Blackwell, TX, destroyed, 1 fatal. Probable cause: The pilot’s failure to maintain proper altitude and clearance during low-level aerial application, resulting in an in-flight collision with power lines.
- [NTSB WPR22LA220](https://openairdocs.org/ntsb/WPR22LA220), Jun 18, 2022: Robinson Helicopter R44 II (N944BC), Auburn, WA, substantial damage. Probable cause: The student pilot’s loss of helicopter control and the flight instructor’s delayed remedial action while providing hover training which resulted in a dynamic rollover.
- [NTSB ERA22LA188](https://openairdocs.org/ntsb/ERA22LA188), Apr 12, 2022: Robinson Helicopter R44 II (N426DB), Calhoun, GA, substantial damage. Probable cause: The pilot’s failure to maintain clearance from wires during takeoff.
- [NTSB ERA22LA135](https://openairdocs.org/ntsb/ERA22LA135), Feb 17, 2022: Robinson Helicopter R44 II (N929WA), White Plains, NY, substantial damage. Probable cause: The pilot’s failure to maintain stabilized lateral control during landing in gusty conditions which resulted in a dynamic rollover when the skids contacted the platform unevenly.
- [NTSB ERA22FA098](https://openairdocs.org/ntsb/ERA22FA098), Dec 31, 2021: Robinson Helicopter R44 II (N442VB), Bronson, FL, destroyed, 4 fatal. Probable cause: A loss of control due to spatial disorientation as a result of the noninstrument-rated pilot’s improper decision to attempt a visual flight rules flight at night into an area of known reduced…
- [NTSB CEN22LA034](https://openairdocs.org/ntsb/CEN22LA034), Nov 10, 2021: Robinson Helicopter R44 II (N3027W), Fort Davis, TX, substantial damage. Probable cause: The pilot’s encounter of a downdraft from which there was insufficient altitude to recover.
- [NTSB ERA22FA010](https://openairdocs.org/ntsb/ERA22FA010), Oct 10, 2021: Robinson Helicopter R44 II (N637HP), Cornwall, NY, destroyed, 1 fatal. Probable cause: The non-instrument-rated pilot’s continued flight into deteriorating weather conditions, which resulted in a loss of control due to spatial disorientation.

All 160: https://openairdocs.org/engine/lycoming-io-540-ae1a5/ntsb.md

## FAA accident and incident reports (178, newest 50)

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.

- [Incident 20260927012349I](https://openairdocs.org/incident/20260927012349I), Sep 27, 2026: Robinson R-44 (N255PK), Ozona, TX, Minor damage. On September 27, 2026, at 1235 CDT, a Robinson R-44 helicopter bearing registration number [privacy data omitted], registered to a corporation, struck a wire…
- [Accident 20260812011269A](https://openairdocs.org/incident/20260812011269A), Aug 12, 2026: Robinson Helicopter Company R44 II (N861MP), Anthony, FL, Substantial damage. The pilot reported that while in cruse flight, the engine had a sudden reduction in power. The pilot initiated an autorotation when power was regained, causing…
- [Accident 20260802011379A](https://openairdocs.org/incident/20260802011379A), Aug 2, 2026: Robinson Helicopter Company R44 II (N26KL), Bennett, IA, Substantial damage. Pilot-in-command experienced an unknown shake/shimmy throughout aircraft while crossing a row of trees. The shake subsided momentarily, then returned.…
- [Accident 20260715007689A](https://openairdocs.org/incident/20260715007689A), Jul 15, 2026: Robinson Helicopter Company R44 II (N322TC), Iowa City, IA, Substantial damage. Pilot-in-command contacted a telephone wire with the right spray boom resulting in an unusual attitude which led to the helicopter crash-landing in a cornfield.
- [Accident 20260417003629A](https://openairdocs.org/incident/20260417003629A), Apr 17, 2026: Robinson Helicopter Company R44 II (N445JS), Crosbyton, TX, Substantial damage. On April 17, 2026, at approximately 1145, a Robinson R44 helicopter, impacted the ground approximately seven miles north of Crosbyton, Texas. The aircraft was…
- [Accident 20260119000302A](https://openairdocs.org/incident/20260119000302A), Jan 19, 2026: Robinson Helicopter Company R44 II (N996NR), Sheridan, WY, Minor damage. Robinson R-44 aircraft #2 was struck in the tail rotor by R-44 #1 both aircraft initiated an emergency landing. No injuries and minor damage to R-44 #2 and…
- [Accident 20250919013159A](https://openairdocs.org/incident/20250919013159A), Sep 19, 2025: Robinson Helicopter R44 (N831VA), Alvord, TX, Substantial damage. During a pinacle landing, the main rotor struck the tail rotor and gearbox assembly tearing the tailsection, tailrotor and gearbox from the aircraft.
- [Accident 20250818018099A](https://openairdocs.org/incident/20250818018099A), Aug 18, 2025: Robinson Helicopter Company R44 II (N877DR), Burlington, WA, Substantial damage. Helcopter was lifing off from a flatbed trailer. In the process of departing, the pilot swung the tail around to depart and subsequently hit the tail boom on…
- [Accident 20250816015469A](https://openairdocs.org/incident/20250816015469A), Aug 16, 2025: Robinson Helicopter Company R44 II (N24DF), Cape Girardeau, MO, Substantial damage. Airman was conducting air tour operations at approximately 400 feet AGL at 75 knots on approach to landing when the aircraft developed abnormal…
- [Accident 20250803011099A](https://openairdocs.org/incident/20250803011099A), Aug 3, 2025: Robinson Helicopter Company R44 II (N750GT), Clarkston, MT, Substantial damage. On August 03, 2025 a Robinson helicopter, model R44, crashed in a remote location se of helena Montana. The pilot was practicing a hover at the time of the…
- [Accident 20250709011119A](https://openairdocs.org/incident/20250709011119A), Jul 9, 2025: Robinson Helicopter Company R44 II (N67RW), Inlet, NY, Substantial damage. Pilot stated he was making an approach to the landing dock located adjacent to the lake. As he descended toward the water he misjudged the amount of decrease…
- [Accident 20250704009429A](https://openairdocs.org/incident/20250704009429A), Jul 4, 2025: Robinson Helicopter Company R44 II (N992TP), Pecos, TX, Substantial damage. On July 04, 2025, at 1105 CDT, a Robinson R-44-II incurred substantial damage when it impacted terrain while attempting to hover-taxi. The aircraft was being…
- [Accident 20250629008789A](https://openairdocs.org/incident/20250629008789A), Jun 29, 2025: Robinson Helicopter Company R44 II (N531AT), Palmer, AK, Substantial damage. Pilot took off from glacier setting with snow covered terrain and flat light conditions. Upon lift up to about 50'AGL facing eastward, pilot initiated left…
- [Accident 20250625012139A](https://openairdocs.org/incident/20250625012139A), Jun 25, 2025: Robinson Helicopter Company R44 II (N144WK), Hawesville, KY, Destroyed. Helicopter was performing agricultural spraying of a corn field when the main rotor mast struck a utility power line. The impact severed the blade links, and…
- [Accident 20250523005559A](https://openairdocs.org/incident/20250523005559A), May 23, 2025: Robinson Helicopter Company R44 II (N1195P), Miami, TX, Destroyed, 1 fatal. On 05/23/2025 at approximately 0718 central time, a Robinson R-44 helicopter bearing registration number [privacy data omitted] impacted terrain approximately…
- [Accident 20250309003779A](https://openairdocs.org/incident/20250309003779A), Mar 9, 2025: Robinson Helicopter Company R44 II (N44KY), North Las Vegas, NV, Substantial damage. On 03/09/2025 at approximately 2105 PST, a Robinson R-44II helicopter, departed the North Las Vegas Airport, kvgt, on a VFR air tour flight of the las Vegas…
- [Accident 20250227002629A](https://openairdocs.org/incident/20250227002629A), Feb 27, 2025: Robinson Helicopter Company R44 II (N144SG), Uvalde, TX, Substantial damage, 2 fatal. The aircraft was being used to perform wildlife animal survey flying 75-100 AGL. Aircraft impacted the ground nose down leaving two parallel scars from the…
- [Accident 20250227001329A](https://openairdocs.org/incident/20250227001329A), Feb 27, 2025: Robinson Helicopter Company R44 II (N6555C), Edgemont, SD, No damage. On 2/27/25 at approximately 7:30AM mt, a Robinson R-44 [privacy data omitted], LLC was conducting an elk survey/capture operation when the gunner fell from the…
- [Accident 20241107016699A](https://openairdocs.org/incident/20241107016699A), Nov 7, 2024: Robinson Helicopter Company R44 II (N4361R), Durkee, OR, Substantial damage. On short final to the ridgeline with an external load the pilot began to settle into the lz. He jettisoned the load and spread the skids in the trees where he…
- [Accident 20241101016939A](https://openairdocs.org/incident/20241101016939A), Nov 1, 2024: Robinson Helicopter Company R44 II (N62CD), Iowa, LA, Destroyed, 3 fatal. A student pilot, whithout a solo endorsement and flying at night, intended to fly his personal helicopter from a restaurant to his home with [privacy data…
- [Accident 20240923013399A](https://openairdocs.org/incident/20240923013399A), Sep 23, 2024: Robinson Helicopter Company R44 II (N153LA), Ravenel, SC, Substantial damage. Eon-dra message text: Ravenel, SC: [privacy data omitted], R44, was executing a precautionary landing on a farm with cattle at [privacy data omitted], SC when…
- [Incident 20240919013729I](https://openairdocs.org/incident/20240919013729I), Sep 19, 2024: Robinson Helicopter Company R44 II (N1413X), Eagle, AK, Minor damage. The pilot departed Eagle, AK enroute to a remote landing zone. Upon arrival, the pilot determined that the landing zone was unsuitable to land. During the…
- [Accident 20240915012459A](https://openairdocs.org/incident/20240915012459A), Sep 15, 2024: Robinson Helicopter Company R44 II (N233WT), Basin, MT, Destroyed. The pilot stated the following: "We landed at our cabin at 1100 in the morning, upon descending into the landing zone I completed a hover check." "The weather…
- [Accident 20240818014129A](https://openairdocs.org/incident/20240818014129A), Aug 18, 2024: Robinson Helicopter Company R44 II (N783AK), Palmer, AK, Substantial damage. On August 18th, 2024, at approximately 1230, a helicopter with 3 passengers and a pilot departed its base of operations on a glacier tour. The passengers…
- [Incident 20240715008539I](https://openairdocs.org/incident/20240715008539I), Jul 15, 2024: Robinson Helicopter Company R44 II (N4QH), Talkeetna, AK, Minor damage. Departed the Talkeetna Airport at 2:00PM local with the current afis and traffic advisory carrying a sling load on a 100FT line. Weather at the airport was…
- [Accident 20240713010499A](https://openairdocs.org/incident/20240713010499A), Jul 13, 2024: Robinson Helicopter R44 II (N6960), Herriman, UT, Substantial damage. During flight pilot/cfi reduced throttle to demonstrate autorotation to student. Immediately following reduction of throttle, experienced engine failure…
- [Accident 20240711008479A](https://openairdocs.org/incident/20240711008479A), Jul 11, 2024: Robinson Helicopter R44 (N144KW), Wainiha, HI, Destroyed, 3 fatal. The accident helicopter departed on an air tour out of lihue (lih) at appx 12:30 HST. The helicopter was occupied by 1 pilot and 2 passengers who were seated…
- [Accident 20240704010619A](https://openairdocs.org/incident/20240704010619A), Jul 4, 2024: Robinson Helicopter Company R44 II (N225AM), New Florence, MO, Destroyed. The airman was conducting part 137 spray operations and made a cleanup pass along the edge of a field, descending to approximately 15 feet above the…
- [Accident 20240619009029A](https://openairdocs.org/incident/20240619009029A), Jun 19, 2024: Robinson Helicopter Company R44 II (N323TT), Bluestem, WA, Destroyed, 2 fatal. Helicopter on cross country flight encountered a sudden loss of altitude while at cruising altitude of 750' and an airspeed of 69 KTS. Aircraft's tailboom was…
- [Accident 20240602009529A](https://openairdocs.org/incident/20240602009529A), Jun 2, 2024: Robinson Helicopter Company R44 II (N220SW), Gilbertsville, KY, Substantial damage. According to the pilot's statement, he departed from his home in carmi, IL and flew to his lake house on Kentucky lake initially landed aircraft without…
- [Accident 20240409004319A](https://openairdocs.org/incident/20240409004319A), Apr 9, 2024: Robinson Helicopter Company R44 II (N331EL), South Kingston, RI, Destroyed. The pilot reported he flew southwest at 800 feet MSL to wordens' pond to perform a flight over the pond. He began executing a series of flight parameters,…
- [Accident 20240201001919A](https://openairdocs.org/incident/20240201001919A), Feb 1, 2024: Robinson Helicopter Company R44 II (N521LS), Miami, FL, Substantial damage. During flight airman noticed that the manifold pressure, engine oil pressure, and temperature were in the red area of the gages. Airman executed a precautional…
- [Accident 20231206021039A](https://openairdocs.org/incident/20231206021039A), Dec 6, 2023: Robinson Helicopter Company R44 II (N422DX), Calexico, CA, Substantial damage. Pilot reported he was performing part 137 spraying operations on multiple agiculture fields. While spraying a fields next to highway 98 in Calexico California…
- [Incident 20230818013659I](https://openairdocs.org/incident/20230818013659I), Aug 18, 2023: Robinson Helicopter Company R44 II (N744ME), Beatty, NV, Minor damage. [privacy data omitted] Was conducting aerial survey of an off road race. While following a race car westbound at approximately 300 feet and 40KTS in a canyon…
- [Accident 20230731010519A](https://openairdocs.org/incident/20230731010519A), Jul 31, 2023: Robinson Helicopter Company R44 II (N644ME), Arcola, IL, Destroyed. The pilot was engaged in part 137 agricultural spraying. The pilot stated that they cleared the field with a survey pass. During the first spray pass parallel…
- [Accident 20230726008029A](https://openairdocs.org/incident/20230726008029A), Jul 26, 2023: Robinson Helicopter Company R44 II (N4174L), Charles City, IA, Substantial damage. Helicopter returned to tender truck for load of product and fuel. Shortly after departing tender truck helicopter descended into a corn field.
- [Accident 20230713015519A](https://openairdocs.org/incident/20230713015519A), Jul 13, 2023: Robinson Helicopter Company R44 II (N62RK), Pocahontas, IL, Destroyed. Narritive - on the evening of 13 July 2023, R-44 helicopter was in flight conducting aerial agricultural applications when a loss of engine power occured and…
- [Incident 20230621009909I](https://openairdocs.org/incident/20230621009909I), Jun 21, 2023: Robinson Helicopter Company R44 II (N225AM), Clarkson, NE, Minor damage. Pilot was conducting part 137 operations. Pilot performed a low recon of a field and did not see a cable ran to a fixture in the field. Helicopter contacted…
- [Accident 20230510016899A](https://openairdocs.org/incident/20230510016899A), May 10, 2023: Robinson Helicopter Company R44 II (N62HT), Bradenton, FL, Substantial damage. R44, landed in a field and Pitched forward causing the aircraft to onto the Left side.
- [Accident 20230509002709A](https://openairdocs.org/incident/20230509002709A), May 9, 2023: Robinson Helicopter R44 II (N704T), Skwentna, AK, Substantial damage. Pilot and two passengers (180 lbs. And 160 lbs.) Plus gear (90LBS) in R44-II helicopter conducting survey around noon at first of three survey points. Fuel on…
- [Accident 20230326003849A](https://openairdocs.org/incident/20230326003849A), Mar 26, 2023: Robinson Helicopter Company R44 II (N441PD), Erwinville, LA, Destroyed, 2 fatal. On 3/26/2023, a Robinson R44 helicopter, flying under CFR part 91 operations departed btr at approximately 0236 hours in pursuit of a drunk driver. The…
- [Incident 20221229019069I](https://openairdocs.org/incident/20221229019069I), Dec 29, 2022: Robinson Helicopter Company R44 II (N4153G), Tampa, FL, Minor damage. Pilot stated this was a sight-seeing flight. Upon approach to tpf he heard a loud bang and then lost all power, he then prepared for emergency landing and…
- [Accident 20220820014859A](https://openairdocs.org/incident/20220820014859A), Aug 20, 2022: Robinson Helicopter Company R44 II (N4447A), Delmita, TX, Substantial damage. Narrative: On August 20, 2022, a Robinson R44 ii helicopter, [privacy data omitted], sustained substantial damage when it was involved in an accident near san…
- [Accident 20220810007559A](https://openairdocs.org/incident/20220810007559A), Aug 10, 2022: Robinson Helicopter Company R44 II (N987WH), Palmer, AK, Substantial damage. Contributing factors include power mismanagement with an steep approach angle and inappropriate airspeed too fast to make the intended point of landing…
- [Accident 20220731007659A](https://openairdocs.org/incident/20220731007659A), Jul 31, 2022: Robinson Helicopter Company R44 II (N458SG), Marshall, MO, Substantial damage. This aircraft was performing agricultural spraying operations over crops in an open field. The pilot stated that he had just finished a spraying pass heading…
- [Accident 20220725007889A](https://openairdocs.org/incident/20220725007889A), Jul 25, 2022: Robinson Helicopter Company R44 II (N497SU), Cedar City, UT, Substantial damage. On July 25, 2022, the instructor and student were practicing autorotations west of Cedar City airport (cdc) in preparation for the student?s private pilot…
- [Accident 20220626007979A](https://openairdocs.org/incident/20220626007979A), Jun 26, 2022: Robinson Helicopter Company R44 II (N4124D), Blackwell, TX, Destroyed, 1 fatal. On June 26, 2022 a Robinson R44 helicopter, N4124D was involved in a fatal accident while conducting an aerial application under 14CFR 137. The commercial…
- [Accident 20220618009899A](https://openairdocs.org/incident/20220618009899A), Jun 18, 2022: Robinson Helicopter Company R44 II (N944BC), Auburn, WA, Substantial damage. Pilot/cfi was giving [privacy data omitted]hovering instruction in a grassy practice area. To correct a backward motion during hover the CFI applied forward…
- [Incident 20220527009029I](https://openairdocs.org/incident/20220527009029I), May 27, 2022: Robinson Helicopter Company R44 II (N794YT), Hampton, GA, Minor damage. The pilot was performing hover work in a 175? X 300? Grassy field enclosed by 50? Trees located 1.5 miles north of khmp. The pilot drifted to close to a small…
- [Accident 20220412005329A](https://openairdocs.org/incident/20220412005329A), Apr 12, 2022: Robinson Helicopter Company R44 II (N426DB), Calhoun, GA, Substantial damage. Pilot was taking 3 passengers for a joy ride flight. Pilot landed aircraft on a vacant 2 acre lot, which he owned in Calhoun, GA. The lot was between a…

All 178: https://openairdocs.org/engine/lycoming-io-540-ae1a5/incidents.md

## Service difficulty reports (924, newest 50)

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

- [SDR 2NVA20260622001](https://openairdocs.org/sdr/2NVA20260622001), Jun 22, 2026: PUMP. INOPERATIVE. LOW FUEL PRESSURE LIGHT ILLUMINATED IN FLIGHT. NO ENGINE ROUGHNESS. VERIFIED ELECTRICAL FUEL PUMP NOT RUNNING. REPLACED ASSY PN D743-3 ASSY PER MM. THIS IS A CO
- [SDR 2026FA0000623](https://openairdocs.org/sdr/2026FA0000623), Dec 5, 2025: CYLINDER. SCORED. THIS IS A NEW AIRCRAFT. LESS THAN 50HRS HAD BEEN FLOWN BEFORE WE FOUND ISSUES. LOGBOOK ENTRY, AIRCRAFT HAD A HARD STARTING CONDITION. FOUND STUCK INTAKE VALVES 
- [SDR 2024FA0000479](https://openairdocs.org/sdr/2024FA0000479), Mar 1, 2024: BOOT. CRACKED. C156-2 WINTER BOOTS (FEATHER BEARINGS ON THE BLADES) DEVELOPED FRACTURES IN THE SILICONE WHERE STRESSES FROM STRETCHING AND DEFORMATION WAS CONCENTRATED. IT WAS
- [SDR YV3R2023111500586](https://openairdocs.org/sdr/YV3R2023111500586), Oct 19, 2023: WARNING UNIT. DEFECTIVE. CUSTOMER REPORTED WARNING UNIT, LOW RPM P/N: A569-9 PART FAILURE, HORN LIGHT STAYS ON.
- [SDR 2023FA0000601](https://openairdocs.org/sdr/2023FA0000601), Oct 17, 2023: MUFFLER. DISTORTED. EXHAUST SYSTEM HEAT DEFORMING. NEW MUFFLER SYSTEM INSTALLED @ 449.94 THEN AGAIN @912.12.
- [SDR YV3R2023100200582](https://openairdocs.org/sdr/YV3R2023100200582), Sep 7, 2023: CONTROLLER. INTERMITTENT. CUSTOMER REPORTED CONTROLLER ASSEMBLY (GOVERNOR) P/N: D278-2 WAS INTERMITTENT.
- [SDR YV3R2023100200580](https://openairdocs.org/sdr/YV3R2023100200580), Aug 29, 2023: SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 WAS FOUND CRACKED.
- [SDR YV3R2023082800578](https://openairdocs.org/sdr/YV3R2023082800578), Aug 25, 2023: SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-1 WAS FOUND CRACKED..
- [SDR YV3R2023092900579](https://openairdocs.org/sdr/YV3R2023092900579), Aug 25, 2023: ACTUATOR. DEFECTIVE. CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 ONLY HAD ONE TENSION PLATE WORKING.
- [SDR 2023FA0000345](https://openairdocs.org/sdr/2023FA0000345), Jun 27, 2023: INTAKE VALVE. SEPARATED. PILOT REPORTED THAT DURING CRUISE FLIGHT ENGINE RPM BEGAN TO FLUCTUATE AND ENGINE BEGAN TO RUN ROUGH. PILOT IMMEDIATELY RETURNED TO BASE AND MADE A NORMAL LANDI
- [SDR YV3R2023071000576](https://openairdocs.org/sdr/YV3R2023071000576), Jun 23, 2023: ALTIMETER. DEFECTIVE. CUSTOMER REPORTED ALTIMETER P/N: A613-2 WAS STICKING AND SLUGGISH IN OPERATION.
- [SDR 2023FA0000278](https://openairdocs.org/sdr/2023FA0000278), May 23, 2023: EXHAUST VALVE. CORRODED. DURING BORE SCOPE INSPECTION OF CYLINDER ASSEMBLIES THE NUMBER 3 CYLINDER EXHAUST VALVE WAS FOUND TO BEY HEAVILY PITTED ON VALVE BELL. THE ENGINE HAS ACCUMULATE
- [SDR YV3R2023051600567](https://openairdocs.org/sdr/YV3R2023051600567), May 10, 2023: RELAY. INOPERATIVE. CUSTOMER REPORTED RELAY ASSEMBLY P/N: B280-12 WAS INOPERATIVE (NO LOW RPM LIGHT OR HORN).
- [SDR YV3R2023051600568](https://openairdocs.org/sdr/YV3R2023051600568), May 10, 2023: SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 WAS FOUND CRACKED.
- [SDR 2024FA0000205](https://openairdocs.org/sdr/2024FA0000205), Apr 21, 2023: CLUTCH ACTUATOR. BROKEN. AFTER PIC LANDED N31471 WITH THE COLLECTIVE FULL DOWN, THE CLUTCH LIGHT ILLUMINATED. AFTER LIGHT HAD BEEN ON FOR 10 SECONDS, PIC PULLED THE CLUTCH CIRCUIT BREAK
- [SDR YV3R2023042700563](https://openairdocs.org/sdr/YV3R2023042700563), Apr 20, 2023: CONTROLLER. DEFECTIVE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 OVER SPEEDS ENGINE AND ROTOR SYSTEM.
- [SDR YV3R2023042700561](https://openairdocs.org/sdr/YV3R2023042700561), Apr 18, 2023: RELAY. FAULTY. CUSTOMER REPORTED RELAY, 40 AMP 24V, SPDT P/N: D260-4 SHORTED INTERNALLY.
- [SDR YV3R2023042700562](https://openairdocs.org/sdr/YV3R2023042700562), Apr 18, 2023: CYLINDER. DEFECTIVE. CUSTOMER REPORTED CYLINDER ASSEMBLY P/N: D679-3 LEAKED BELOW ALLOWABLE INDICATION LIMIT.
- [SDR YV3R2023031500554](https://openairdocs.org/sdr/YV3R2023031500554), Feb 28, 2023: SHIELD. CRACKED. CUSTOMER REPORTED SHIELD P/N: D785-4 CRACKED IN HALF.
- [SDR YV3R2023031500552](https://openairdocs.org/sdr/YV3R2023031500552), Feb 16, 2023: ACTUATOR. DEFECTIVE. CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 FAILED SWITCH TEST.
- [SDR YV3R2023031500553](https://openairdocs.org/sdr/YV3R2023031500553), Feb 16, 2023: SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 CRACKED.
- [SDR YV3R2023031400551](https://openairdocs.org/sdr/YV3R2023031400551), Jan 4, 2023: CONTROLLER. DEFECTIVE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 GIVING A HIGH READING OF MORE THAN 101% RPM.
- [SDR YV3R2023031400549](https://openairdocs.org/sdr/YV3R2023031400549), Dec 15, 2022: CONTROLLER. MALFUNCTIONED. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 MALFUNCTIONED.
- [SDR YV3R2022111700548](https://openairdocs.org/sdr/YV3R2022111700548), Nov 1, 2022: CONTROLLER. DEFECTIVE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 GIVES HIGH READINGS ON DUAL TACHOMETER.
- [SDR YV3R2022111700547](https://openairdocs.org/sdr/YV3R2022111700547), Oct 31, 2022: DUAL TACHOMETER. DEFECTIVE. CUSTOMER REPORTED DUAL TACHOMETER ASSEMBLY P/N: C792-5 FLUCTUATES CAUSING OVER RPM.
- [SDR 2022FA0000591](https://openairdocs.org/sdr/2022FA0000591), Oct 4, 2022: NONE. COLLAPSED. THE AIRCRAFT LANDED UNEVENTFULLY AND WAS SHUT DOWN BY THE PILOT. AFTER SHUTDOWN THE PILOT INSTALLED THE GROUND HANDLING WHEELS AND BEGAN TO MOVE THE AIRCRAFT IN
- [SDR YV3R2022100700544](https://openairdocs.org/sdr/YV3R2022100700544), Sep 15, 2022: NONE. FAILED. CUSTOMER REPORTED WARNING UNIT ASSEMBLY (LOW RPM) P/N: A569-9 FAILED TO ACTIVATE LIGHT AND HORN.
- [SDR YV3R2022091400537](https://openairdocs.org/sdr/YV3R2022091400537), Aug 24, 2022: COORDINATOR. DEFECTIVE. TURN COORDINATOR ASSEMBLY P/N: B329-1 WAS INOPERATIVE.
- [SDR YV3R2022091300535](https://openairdocs.org/sdr/YV3R2022091300535), Aug 8, 2022: GOVERNOR. DEFECTIVE. CUSTOMER REPORTED GOVERNOR ASSEMBLY P/N: B247-5 WAS UNSERVICEABLE (INTERMITTENT). TESTING RESULTS: INTERMITTENT IN WIRES APPROXIMATELY 0.5" FROM GROMMET.
- [SDR 2022FA0000525](https://openairdocs.org/sdr/2022FA0000525), Jul 21, 2022: EXHAUST VALVE. BROKEN. DURING CRUISE FLIGHT ENGINE BEGAN TO RUN ROUGH AND MANIFOLD PRESSURE INCREASED. PILOT WAS ABLE TO RETURN TO THE HELIPAD AND MAKE A NORMAL LANDING. EXHAUST VALVE
- [SDR 2022FA0000352](https://openairdocs.org/sdr/2022FA0000352), Jul 13, 2022: EXHAUST VALVE. BROKEN. NUMBER ONE CYLINDER EXHAUST VALVE STEM BROKE RELEASING VALVE INTO CYLINDER.
- [SDR YV3R2022071100533](https://openairdocs.org/sdr/YV3R2022071100533), Jul 7, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED EVAPORATOR ASSEMBLY P/N: D798-1 CAUSES COMPRESSOR TO SHORT CYCLE, AND DOES NOT COOL.
- [SDR 2022FA0000440](https://openairdocs.org/sdr/2022FA0000440), Jun 25, 2022: EXHAUST VALVE. BROKEN. EXHAUST VALVE BROKE AT STEM AND ENGINE SUFFERED PARTIAL LOSS OF POWER.
- [SDR YV3R2022071100532](https://openairdocs.org/sdr/YV3R2022071100532), Jun 16, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED GOVERNOR CONTROLLER ASSEMBLY P/N: D278-2 RUNS TO 106%.
- [SDR YV3R2022052600530](https://openairdocs.org/sdr/YV3R2022052600530), May 17, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED TAIL ROTOR GEARBOX ASSEMBLY P/N: C021-1 LEAKED FROM THE INPUT CARTRIDGE SEAL.
- [SDR YV3R2022050400526](https://openairdocs.org/sdr/YV3R2022050400526), Apr 21, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 WAS UNSERVICEABLE.
- [SDR YV3R2022050400525](https://openairdocs.org/sdr/YV3R2022050400525), Apr 9, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED DUAL TACHOMETER ASSEMBLY P/N: C792-4 NEEDLES WERE JUMPING WITHIN UNIT.
- [SDR 2022FA0000524](https://openairdocs.org/sdr/2022FA0000524), Apr 8, 2022: EXHAUST VALVE. BROKEN. DURING CRUISE FLIGHT PILOT REPORTED ENGINE BEGAN TO RUN ROUGH AND MANIFOLD PRESSURE INCREASED. HELICOPTER RETURNED TO HELIPAD AND MADE A NORMAL LANDING. EXHAUST
- [SDR YV3R2022030400521](https://openairdocs.org/sdr/YV3R2022030400521), Feb 28, 2022: NONE. NONE. CUSTOMER REPORTED COVER ASSEMBLY (COOLING PANEL) P/N: D382-4 WAS CRACKED.
- [SDR YV3R2022030400520](https://openairdocs.org/sdr/YV3R2022030400520), Feb 16, 2022: NONE. NONE. CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 COLUMN SPRINGS DID NOT ACTUATE SIMULTANEOUSLY.
- [SDR YV3R2022031000522](https://openairdocs.org/sdr/YV3R2022031000522), Feb 16, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 WAS INOPERATIVE.
- [SDR YV3R2022050400524](https://openairdocs.org/sdr/YV3R2022050400524), Feb 14, 2022: NONE. DEFECTIVE. CUSTOMER REPORTED WARNING UNIT ASSEMBLY P/N: A569-9 FAILED TO REACT TO RPM'S.
- [SDR YV3R2022011000507](https://openairdocs.org/sdr/YV3R2022011000507), Dec 14, 2021: NONE. NONE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 OCCASIONALLY ROLLED OFF WHEN COLD.
- [SDR YV3R2022011000505](https://openairdocs.org/sdr/YV3R2022011000505), Nov 30, 2021: NONE. NONE. DURING MAINTENANCE GROUND RUN, GOVERNOR CONTROLLER P/N: D278-2 INDICATED HIGH RPM WITH INDICATOR NEEDLE ON THE RED ARC.
- [SDR YV3R2021112000503](https://openairdocs.org/sdr/YV3R2021112000503), Nov 10, 2021: NONE. NONE. CUSTOMER REPORTED ACTUATOR ASSEMBLY P/N: C051-2 COLUMN SPRINGS FAILED TO ACTUATE MICRO SWITCH.
- [SDR YV3R2021110900499](https://openairdocs.org/sdr/YV3R2021110900499), Oct 1, 2021: NONE. NONE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2, ENGINE INDICATION HIGH AND UNABLE TO ADJUST.
- [SDR YV3R2021100700496](https://openairdocs.org/sdr/YV3R2021100700496), Sep 22, 2021: NONE. DEFECTIVE. CUSTOMER REPORTED CONTROLLER ASSEMBLY P/N: D278-2 WILL NOT MAINTAIN RPM.
- [SDR YV3R2021072200471](https://openairdocs.org/sdr/YV3R2021072200471), Jul 12, 2021: WARNING UNIT. DEFECTIVE. CUSTOMER REPORTED WARNING UNIT P/N: A569-9 HORN (AUDIO) DID NOT SOUND.
- [SDR YV3R2021072200470](https://openairdocs.org/sdr/YV3R2021072200470), Jul 8, 2021: STRUT. LEAKING. CUSTOMER REPORTED CYLINDER ASSEMBLY P/N: D679-3 WAS LEAKING. UPON TROUBLESHOOTING, GAUGE P/N: D769-1 WAS FOUND LEAKING.
- [SDR YV3R2021070700469](https://openairdocs.org/sdr/YV3R2021070700469), Jun 30, 2021: DUAL TACHOMETER. DEFECTIVE. CUSTOMER REPORTED DUAL TACHOMETER P/N: C792-4 ROTOR NEEDLE READS LOW 2-5%.

All 924: https://openairdocs.org/engine/lycoming-io-540-ae1a5/reports.md

## STCs that may be installed (OpenAirDocs) (41)

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 SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines. B & C Specialty Products Inc
- [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 SE2387CE](https://openairdocs.org/stc/SE2387CE): Installation of B & C Speciality Products lightweight (10.2 pounds) engine starter P/N BC 315-100-1(12 volt) or P/N BC 315-100-3(24 volt). B & C Specialty Products Inc. Lists IO-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 SE09445SC](https://openairdocs.org/stc/SE09445SC): Installation of fuel injector nozzles. General Aviation Modifications Inc. Lists IO-540 Series
- [STC SE4408SW](https://openairdocs.org/stc/SE4408SW): Miscellaneous engine cylinder replacement parts. Continental Motors, Inc. Lists IO-540 Series
- [STC SE7509SW](https://openairdocs.org/stc/SE7509SW): Installation of any or all parts listed on Airmotive Engineering Drawing List No. 852-1, Rev. 1, dated 10/4/88, or later FAA approved revision. Continental Motors, Inc. Lists IO-540 Series
- [STC SE7667SW](https://openairdocs.org/stc/SE7667SW): Installation of parts listed on Drawing List No. 8810-3, Rev 6. Continental Motors, Inc. Lists IO-540 Series
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists IO-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 IO-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 IO-540 Series
- [STC SE2901NM](https://openairdocs.org/stc/SE2901NM): Lycoming valve cover gasket. Real Gaskets Tennessee
- [STC SE2902NM](https://openairdocs.org/stc/SE2902NM): Lycoming valve cover gasket. Real Gaskets Tennessee
- [STC SE7582SW](https://openairdocs.org/stc/SE7582SW): Grinding of high compression NITRIDED Cylinders to .010 oversize, as an alternative to chrome plating or rebarreling, and the installation of SL10207 P10 Piston, SL74241 P10 Top and second compression ring, and SL 73857 P10 oil control ring. Superior Air Parts, Inc
- [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. Lists IO-540 Series
- [STC SE01524CH](https://openairdocs.org/stc/SE01524CH): Replace Slick 6000, 6100, 6200, 6300, 4000, 4100, 4200, and 4300 series magnetos and TCM/Bendix S6-20, S6-200, S6-1200, S-20, S-200, and S-1200 series magnetos with Champion Limited Authority Spark Advance Regulator (LASAR ) Model 4755 and 6755 bush kit ignition systems. Champion Aerospace LLC. Lists IO-540 Series
- [STC SE01930NY](https://openairdocs.org/stc/SE01930NY): Installation of Casper Labs 90 degree oil filter housing adapter. Casper Labs Inc
- [STC SE1779NM](https://openairdocs.org/stc/SE1779NM): Installation of Precise Flight, Inc. Standby Vacuum System SVS III. Precise Flight Inc
- [STC SE22WE](https://openairdocs.org/stc/SE22WE): Installation of AiResearch Turbosupercharger 406610-3. Approved for IO-540-J4A5 model. GE Engine Services-Corporate Aviation Inc. DBA Garrett Aviation Services. Lists IO-540 Series
- [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 IO-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 IO-540 Series
- [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation
- [STC SE8023SW](https://openairdocs.org/stc/SE8023SW): Installation and usage of AEROSHELL. Shell Development Co. Lists IO-540 Series
- [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp. Lists IO-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 IO-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 IO-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 IO-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 IO-540 Series
- [STC SE1445SO](https://openairdocs.org/stc/SE1445SO): Use of Aero-blend oil additive in Teledyne (non turbocharged) aircraft engines. ProTec. Lists IO-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 IO-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 IO-540 Series
- [STC SA01436DE](https://openairdocs.org/stc/SA01436DE) (historical): Installation of Firewall Forward Technologies, LLC modified camshaft. Centri-Lube Technologies LLC

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