# Continental GTSIO-520 series

- Type: Engine model (FAA registry)
- Registry codes: 17046, 17039
- Manufacturer (registry): CONT MOTOR
- Model: GTSIO-520 SER
- Engine type: Reciprocating
- Power: 300 hp
- Data sheet: [TCDS E7CE](https://openairdocs.org/tcds/E7CE) (OpenAirDocs)
- Holder: Continental Aerospace Technologies, Inc.
- Installed in: 178 registered aircraft
- Page: https://openairdocs.org/engine/continental-gtsio-520-series

The registry names only the engine series, so ADs for every model in the series are matched. The FAA lists this model under more than one registry code, usually for different spellings of the maker. This page covers them all.

## 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 2023-05-16](https://openairdocs.org/ad/2023-05-16): Reciprocating Engine Power Section · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 147 more. Effective Mar 15, 2023
- [AD 2023-02-12](https://openairdocs.org/ad/2023-02-12): Engine Air Intake System · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 127 more. Effective Feb 17, 2023
- [AD 2022-16-03](https://openairdocs.org/ad/2022-16-03): Engine (RECIPROCATING) · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 236 more. Effective Aug 15, 2022
- [AD 2020-16-11](https://openairdocs.org/ad/2020-16-11): SUMMARY: Reciprocating Cylinder Section · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 23 more. Effective Sep 21, 2020
- [AD 2016-16-12](https://openairdocs.org/ad/2016-16-12): Cylinder assemblies · Continental Motors LTSIO-520-AE, TSIO-520-A, TSIO-520-AE and 89 more. Effective Sep 15, 2016
- [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 2011-13-03](https://openairdocs.org/ad/2011-13-03): Turbocharger Turbine · Lycoming Engines LTO-360-E1A6D, O-540-L3C5D, TIGO-541-E1A and 20 more. Effective Jul 13, 2011
- [AD 2010-11-04](https://openairdocs.org/ad/2010-11-04): Hydraulic lifters · Continental Motors FSO-470-A, GIO-470-A, GTSIO-520-C and 190 more. Effective Jun 16, 2010
- [AD 2010-07-08](https://openairdocs.org/ad/2010-07-08): Turbochargers · Kelly Aerospace Energy Systems HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 137 more. Effective Apr 19, 2010
- [AD 2008-08-17](https://openairdocs.org/ad/2008-08-17): Turbocharger turbine housing flange and the exhaust tube flange · Teledyne Continental Motors TSIOL-550-A 'Liquid-Cooled' engines (RAM Aircraft Limited Partnership STC SA7633SW or SA7633SW-D). Effective May 6, 2008
- [AD 2007-05-15](https://openairdocs.org/ad/2007-05-15): Starter adapter assembly · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 6 more. Effective Apr 16, 2007
- [AD 2004-08-10](https://openairdocs.org/ad/2004-08-10): Serial-numbered (SN) cylinders · Modify Teledyne Continental TSIO-520-NB engine (RAM Aircraft Limited Partnership STC SE09104SC or 4 others). Effective May 5, 2004
- [AD 99-19-01](https://openairdocs.org/ad/99-19-01): No. 2 and No. 5 Crankshaft Inspections · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 127 more. Effective Sep 30, 1999
- [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 96-12-22](https://openairdocs.org/ad/96-12-22): Full Flow Engine Oil Adapter · Bellanca CH-300 Pacemaker, 120, 140 and 361 more. Effective Jul 31, 1996
- [AD 95-21-15](https://openairdocs.org/ad/95-21-15): Aviation Gasoline · Continental Motors A-65-8, C85-12F, C85-12FJ and 77 more. Effective Nov 28, 1995
- [AD 93-10-02](https://openairdocs.org/ad/93-10-02): Missing Cylinder Valve Retainer Key · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 180 more. Effective Aug 12, 1993
- [AD 91-19-03](https://openairdocs.org/ad/91-19-03): Oil Filter · Continental Motors 6-285-A, 6-285-B, 6-285-BA and 169 more. Effective Sep 29, 1991
- [AD 87-04-05](https://openairdocs.org/ad/87-04-05): Fuel Pump · Continental Motors GTSIO-520-N. Effective Dec 1, 1988
- [AD 88-03-06](https://openairdocs.org/ad/88-03-06): Oil Filter · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 155 more. Effective Apr 15, 1988
- [AD 86-13-04 R3](https://openairdocs.org/ad/86-13-04-R3): Cylinder Assemblies · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 44 more. Effective Feb 24, 1988
- [AD 81-24-06](https://openairdocs.org/ad/81-24-06): Engine Driven Fuel Pumps · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 51 more. Effective Nov 23, 1981
- [AD 80-25-06 R1](https://openairdocs.org/ad/80-25-06-R1): Engine Oil Pressure · Continental Motors GTSIO-520-L, GTSIO-520-M and GTSIO-520-N. Effective Mar 23, 1981
- [AD 79-05-09](https://openairdocs.org/ad/79-05-09): Oil Pump Assembly Or Oil Pressure Relief Valve Screw And/Or Plunger · Teledyne Continental Motors 6-285-CA, GTSIO-520-C, GTSIO-520-D and 60 more. Effective Mar 12, 1979
- [AD 75-09-13](https://openairdocs.org/ad/75-09-13): Turbocharger Oil Inlet Adapter · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 9 more. Effective Apr 24, 1975
- [AD 80-09-11](https://openairdocs.org/ad/80-09-11): Starter Torsional Damper/Starter Gear Shaft · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 6 more
- [AD 77-13-22](https://openairdocs.org/ad/77-13-22): Crankcase Cracks · Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 22 more

Historical (superseded or no longer in force):

- [AD 2023-04-08](https://openairdocs.org/ad/2023-04-08) (historical): Reciprocating Engine Power Section · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-H and 141 more. Effective Feb 23, 2023
- [AD 2009-24-52](https://openairdocs.org/ad/2009-24-52) (historical): Hydraulic lifters · Continental Motors FSO-470-A, GIO-470-A, GTSIO-520-C and 192 more
- [AD 2009-24-51](https://openairdocs.org/ad/2009-24-51) (historical): Hydraulic lifters · Teledyne Continental Motors FSO-470-A, GIO-470-A, GTSIO-520-C and 156 more
- [AD 2005-20-04](https://openairdocs.org/ad/2005-20-04) (historical): Starter adapter assembly · Teledyne Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E and 6 more. Effective Nov 1, 2005
- [AD 94-14-12](https://openairdocs.org/ad/94-14-12) (historical): Octane Aviation Gasoline · Teledyne Continental Motors A-65-8, C85-12, E185-11 and 68 more

## Information bulletins (advisory) (7)

- [SAIB NE-18-16](https://openairdocs.org/saib/NE-18-16): POWERPLANT  Alternator Drive Coupling. Issued Jun 20, 2018
- [SAIB NE-16-13](https://openairdocs.org/saib/NE-16-13): Powerplant - Prohibited use of sealant. Issued Mar 8, 2016
- [SAIB NE-13-15](https://openairdocs.org/saib/NE-13-15): Engine Controls: Continental Motors, Inc. (CMI) Throttle and Mixture Control Levers. Issued Feb 8, 2013
- [SAIB NE-13-04](https://openairdocs.org/saib/NE-13-04): Continental Motors, Inc. (CMI) Connecting Rod Piston Pin Bushing Inspection. Issued Oct 31, 2012
- [SAIB NE-10-09](https://openairdocs.org/saib/NE-10-09): Reciprocating Engine Power Section: Hydraulic Valve Lifters. Issued Nov 20, 2009
- [SAIB NE-09-08](https://openairdocs.org/saib/NE-09-08): Reciprocating Engine Cylinder Section. Issued Jan 30, 2009
- [SAIB NE-01-17](https://openairdocs.org/saib/NE-01-17): . Issued Mar 2, 2001

## Registered aircraft (178, first 50)

- [N116JJ](https://openairdocs.org/aircraft/N116JJ): [Progress Aviation LLC](https://openairdocs.org/faa-owner/PROGRESS%20AVIATION%20LLC), [Ellicott City, MD](https://openairdocs.org/faa-place/MD/Ellicott%20City), built 1984, S/N 421C1404
- [N1206N](https://openairdocs.org/aircraft/N1206N): [Capital Group Inc](https://openairdocs.org/faa-owner/CAPITAL%20GROUP%20INC), [Garden City, ID](https://openairdocs.org/faa-place/ID/Garden%20City), built 1985, S/N 421C1805
- [N124TM](https://openairdocs.org/aircraft/N124TM): [Universal Aviation LLC](https://openairdocs.org/faa-owner/UNIVERSAL%20AVIATION%20LLC), [Decatur, AR](https://openairdocs.org/faa-place/AR/Decatur), S/N 421C-0898
- [N12RJ](https://openairdocs.org/aircraft/N12RJ): [Desert Air Ambulance Inc](https://openairdocs.org/faa-owner/DESERT%20AIR%20AMBULANCE%20INC), [Blythe, CA](https://openairdocs.org/faa-place/CA/Blythe), built 1977, S/N 421C0306
- [N13HL](https://openairdocs.org/aircraft/N13HL): [Freedom 421b LLC](https://openairdocs.org/faa-owner/FREEDOM%20421B%20LLC), [Jacksonville, FL](https://openairdocs.org/faa-place/FL/Jacksonville), built 1975, S/N 421B0927
- [N13PG](https://openairdocs.org/aircraft/N13PG): [Johnston Steven P](https://openairdocs.org/faa-owner/JOHNSTON%20STEVEN%20P), [Coto De Caza, CA](https://openairdocs.org/faa-place/CA/Coto%20De%20Caza), built 1976, S/N 421C0031
- [N1421M](https://openairdocs.org/aircraft/N1421M): [Mcculloch Kurt D](https://openairdocs.org/faa-owner/MCCULLOCH%20KURT%20D), [Reno, NV](https://openairdocs.org/faa-place/NV/Reno), built 1976, S/N 421C0106
- [N144ML](https://openairdocs.org/aircraft/N144ML): [Lewis University](https://openairdocs.org/faa-owner/LEWIS%20UNIVERSITY), [Romeoville, IL](https://openairdocs.org/faa-place/IL/Romeoville), built 2000, S/N LIV-149
- [N146TJ](https://openairdocs.org/aircraft/N146TJ): [Birdboys2 Aviation LLC](https://openairdocs.org/faa-owner/BIRDBOYS2%20AVIATION%20LLC), [Boerne, TX](https://openairdocs.org/faa-place/TX/Boerne), built 1978, S/N 421C0500
- [N1510G](https://openairdocs.org/aircraft/N1510G): [Gmr Leasing LLC](https://openairdocs.org/faa-owner/GMR%20LEASING%20LLC), [Lincoln, DE](https://openairdocs.org/faa-place/DE/Lincoln), built 1974, S/N 421B0606
- [N160DC](https://openairdocs.org/aircraft/N160DC): [Pdii LLC](https://openairdocs.org/faa-owner/PDII%20LLC), [Concord, NC](https://openairdocs.org/faa-place/NC/Concord), built 1980, S/N 421C0856
- [N188GW](https://openairdocs.org/aircraft/N188GW): [Brown Die Casting & Manufacturing Inc](https://openairdocs.org/faa-owner/BROWN%20DIE%20CASTING%20%26%20MANUFACTURING%20INC), [Royse City, TX](https://openairdocs.org/faa-place/TX/Royse%20City), built 1979, S/N 421C0613
- [N18T](https://openairdocs.org/aircraft/N18T): [N18t Ltd](https://openairdocs.org/faa-owner/N18T%20LTD), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1968, S/N 421-0144
- [N1QM](https://openairdocs.org/aircraft/N1QM): [Ahlhorn Travis W](https://openairdocs.org/faa-owner/AHLHORN%20TRAVIS%20W), [New Braunfels, TX](https://openairdocs.org/faa-place/TX/New%20Braunfels), built 1979, S/N 421C0701
- [N200BN](https://openairdocs.org/aircraft/N200BN): [Rubber Duck Aviation LLC](https://openairdocs.org/faa-owner/RUBBER%20DUCK%20AVIATION%20LLC), [Brunswick, GA](https://openairdocs.org/faa-place/GA/Brunswick), built 1980, S/N 421C0881
- [N210GM](https://openairdocs.org/aircraft/N210GM): [Stipe Leslie Wayne](https://openairdocs.org/faa-owner/STIPE%20LESLIE%20WAYNE), [Mcalester, OK](https://openairdocs.org/faa-place/OK/Mcalester), built 1976, S/N 21061393
- [N214CC](https://openairdocs.org/aircraft/N214CC): [Steele Aviation LLC](https://openairdocs.org/faa-owner/STEELE%20AVIATION%20LLC), [Tuscaloosa, AL](https://openairdocs.org/faa-place/AL/Tuscaloosa), S/N 421C0670
- [N21SG](https://openairdocs.org/aircraft/N21SG): [Two One Sierra Golf LLC](https://openairdocs.org/faa-owner/TWO%20ONE%20SIERRA%20GOLF%20LLC), [Seattle, WA](https://openairdocs.org/faa-place/WA/Seattle), built 1976, S/N 421C0039
- [N21SS](https://openairdocs.org/aircraft/N21SS): [Midwest Corporate Air Inc](https://openairdocs.org/faa-owner/MIDWEST%20CORPORATE%20AIR%20INC), [Bellefontaine, OH](https://openairdocs.org/faa-place/OH/Bellefontaine), built 1978, S/N 421C0473
- [N228JH](https://openairdocs.org/aircraft/N228JH): [Buzzed Landing LLC](https://openairdocs.org/faa-owner/BUZZED%20LANDING%20LLC), [Ocean Springs, MS](https://openairdocs.org/faa-place/MS/Ocean%20Springs), built 1980, S/N 421C-1006
- [N234MD](https://openairdocs.org/aircraft/N234MD): [Murphy David F](https://openairdocs.org/faa-owner/MURPHY%20DAVID%20F), [Amsterdam, NY](https://openairdocs.org/faa-place/NY/Amsterdam), built 1958, S/N 58-12093
- [N23RL](https://openairdocs.org/aircraft/N23RL): [Caljet Inc](https://openairdocs.org/faa-owner/CALJET%20INC), [Van Nuys, CA](https://openairdocs.org/faa-place/CA/Van%20Nuys), built 1981, S/N 421C1094
- [N241TS](https://openairdocs.org/aircraft/N241TS): [Grey Matter Inc](https://openairdocs.org/faa-owner/GREY%20MATTER%20INC), [Valley Springs, CA](https://openairdocs.org/faa-place/CA/Valley%20Springs), S/N 421B0110
- [N260RA](https://openairdocs.org/aircraft/N260RA): [Upward Aviation LLC](https://openairdocs.org/faa-owner/UPWARD%20AVIATION%20LLC), [Tulsa, OK](https://openairdocs.org/faa-place/OK/Tulsa), built 1980, S/N 421C1004
- [N264DC](https://openairdocs.org/aircraft/N264DC): [Airdvm LLC](https://openairdocs.org/faa-owner/AIRDVM%20LLC), [Rcho Sta Marg, CA](https://openairdocs.org/faa-place/CA/Rcho%20Sta%20Marg), built 1982, S/N 421C1248
- [N2657N](https://openairdocs.org/aircraft/N2657N): [Loreto Aviation LLC](https://openairdocs.org/faa-owner/LORETO%20AVIATION%20LLC), [Wahoo, NE](https://openairdocs.org/faa-place/NE/Wahoo), S/N 421C0811
- [N26588](https://openairdocs.org/aircraft/N26588): [Golden Aero LLC](https://openairdocs.org/faa-owner/GOLDEN%20AERO%20LLC), [Tarpon Springs, FL](https://openairdocs.org/faa-place/FL/Tarpon%20Springs), built 1980, S/N 421C0835
- [N2660U](https://openairdocs.org/aircraft/N2660U): [United Front Holdings LLC](https://openairdocs.org/faa-owner/UNITED%20FRONT%20HOLDINGS%20LLC), [Laguna Hills, CA](https://openairdocs.org/faa-place/CA/Laguna%20Hills), built 1981, S/N 421C1210
- [N284DM](https://openairdocs.org/aircraft/N284DM): [Dreamworks Aviation LLC](https://openairdocs.org/faa-owner/DREAMWORKS%20AVIATION%20LLC), [Palm Beach Gardens, FL](https://openairdocs.org/faa-place/FL/Palm%20Beach%20Gardens), built 1984, S/N 421C1406
- [N287TA](https://openairdocs.org/aircraft/N287TA): [Sivad Holdings Corp](https://openairdocs.org/faa-owner/SIVAD%20HOLDINGS%20CORP), [Nacogdoches, TX](https://openairdocs.org/faa-place/TX/Nacogdoches), built 2025, S/N 087/US
- [N28RH](https://openairdocs.org/aircraft/N28RH): [National Airplane Sales & Leasing Corp](https://openairdocs.org/faa-owner/NATIONAL%20AIRPLANE%20SALES%20%26%20LEASING%20CORP), [Lima, OH](https://openairdocs.org/faa-place/OH/Lima), built 1980, S/N 421C0847
- [N2957Q](https://openairdocs.org/aircraft/N2957Q): [Generals International Inc](https://openairdocs.org/faa-owner/GENERALS%20INTERNATIONAL%20INC), [Red Oak, TX](https://openairdocs.org/faa-place/TX/Red%20Oak), built 1969, S/N 421A0057
- [N299GB](https://openairdocs.org/aircraft/N299GB): [Hoodoo LLC](https://openairdocs.org/faa-owner/HOODOO%20LLC), [Missoula, MT](https://openairdocs.org/faa-place/MT/Missoula), built 1980, S/N 421C1031
- [N311CA](https://openairdocs.org/aircraft/N311CA): [Southern Wings LLC](https://openairdocs.org/faa-owner/SOUTHERN%20WINGS%20LLC), [Shreveport, LA](https://openairdocs.org/faa-place/LA/Shreveport), built 1977, S/N 421C0252
- [N311JH](https://openairdocs.org/aircraft/N311JH): [Huaco Aviation LLC](https://openairdocs.org/faa-owner/HUACO%20AVIATION%20LLC), [Waco, TX](https://openairdocs.org/faa-place/TX/Waco), built 1980, S/N 421C0814
- [N315M](https://openairdocs.org/aircraft/N315M): [Duckwing LLC](https://openairdocs.org/faa-owner/DUCKWING%20LLC), [Reno, NV](https://openairdocs.org/faa-place/NV/Reno), S/N 421B0107
- [N31KS](https://openairdocs.org/aircraft/N31KS): [Paxton Jacob](https://openairdocs.org/faa-owner/PAXTON%20JACOB), [Killeen, TX](https://openairdocs.org/faa-place/TX/Killeen), S/N 421B-0662
- [N321HA](https://openairdocs.org/aircraft/N321HA): [Skytook LLC](https://openairdocs.org/faa-owner/SKYTOOK%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1973, S/N 421B0420
- [N342RC](https://openairdocs.org/aircraft/N342RC): [Hyland'S Pharmacy LLC](https://openairdocs.org/faa-owner/HYLAND'S%20PHARMACY%20LLC), [Wheeler, TX](https://openairdocs.org/faa-place/TX/Wheeler), built 1982, S/N 421C-1243
- [N344TC](https://openairdocs.org/aircraft/N344TC): [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), S/N 421C0424
- [N355RT](https://openairdocs.org/aircraft/N355RT): [Beechwood Aviation LLC](https://openairdocs.org/faa-owner/BEECHWOOD%20AVIATION%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1974, S/N 421B0633
- [N369RM](https://openairdocs.org/aircraft/N369RM): [Rothschild Jonathan Trustee](https://openairdocs.org/faa-owner/ROTHSCHILD%20JONATHAN%20TRUSTEE), [Tucson, AZ](https://openairdocs.org/faa-place/AZ/Tucson), built 1976, S/N 421C0071
- [N375KC](https://openairdocs.org/aircraft/N375KC): [Guittard Chocolate Holdings Co](https://openairdocs.org/faa-owner/GUITTARD%20CHOCOLATE%20HOLDINGS%20CO), [Burlingame, CA](https://openairdocs.org/faa-place/CA/Burlingame), built 1982, S/N 421C1226
- [N37JK](https://openairdocs.org/aircraft/N37JK): [Ssr LLC](https://openairdocs.org/faa-owner/SSR%20LLC), [Incline Village, NV](https://openairdocs.org/faa-place/NV/Incline%20Village), S/N 421B0934
- [N37RZ](https://openairdocs.org/aircraft/N37RZ): [Owens Martin](https://openairdocs.org/faa-owner/OWENS%20MARTIN), [Telluride, CO](https://openairdocs.org/faa-place/CO/Telluride), built 1979, S/N 421C0823
- [N388BC](https://openairdocs.org/aircraft/N388BC): [Aerospace Trust Management LLC](https://openairdocs.org/faa-owner/AEROSPACE%20TRUST%20MANAGEMENT%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1975, S/N D-9786
- [N3920C](https://openairdocs.org/aircraft/N3920C): [N3920c Lc](https://openairdocs.org/faa-owner/N3920C%20LC), [Wichita, KS](https://openairdocs.org/faa-place/KS/Wichita), built 1976, S/N 421C0145
- [N404NE](https://openairdocs.org/aircraft/N404NE): [Fehlhaber Wolfgang M](https://openairdocs.org/faa-owner/FEHLHABER%20WOLFGANG%20M), [Port Orange, FL](https://openairdocs.org/faa-place/FL/Port%20Orange), built 1981, S/N 404-0857
- [N40ME](https://openairdocs.org/aircraft/N40ME): [Unlimited Boat Sales Inc](https://openairdocs.org/faa-owner/UNLIMITED%20BOAT%20SALES%20INC), [Page, AZ](https://openairdocs.org/faa-place/AZ/Page), S/N 421C1241
- [N40RU](https://openairdocs.org/aircraft/N40RU): [Moore Terry Alexander Trustee](https://openairdocs.org/faa-owner/MOORE%20TERRY%20ALEXANDER%20TRUSTEE), [Adel, GA](https://openairdocs.org/faa-place/GA/Adel), built 1980, S/N 421C0878

All 178: https://openairdocs.org/engine/continental-gtsio-520-series/aircraft.md

## NTSB investigations (33)

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 ERA26LA314](https://openairdocs.org/ntsb/ERA26LA314), Aug 21, 2026: Cessna 421 (N28RH), Fulton, KY, substantial damage. Probable cause: The misfuelling of the airplane by the refueler. Contributing to the accident was the pilot’s failure to verify that the airplane had been properly fueled prior to departing on the accident flight.
- [NTSB WPR24FA289](https://openairdocs.org/ntsb/WPR24FA289), Aug 31, 2024: Cessna 421C (N421GP), Fairview, OR, substantial damage, 3 fatal, investigation ongoing
- [NTSB GAA24WA258](https://openairdocs.org/ntsb/GAA24WA258), Jul 18, 2024: Cessna 421C (N264DC), Tofino, Canada, 3 fatal
- [NTSB CEN24LA061](https://openairdocs.org/ntsb/CEN24LA061), Dec 8, 2023: Cessna 421C (N146TJ), McGregor, TX, substantial damage. Probable cause: The failure of the spring pin in the right propeller governor, which precluded the pilot from controlling the propeller pitch to maintain engine rpm, resulting in a loss of engine thrust, excessive…
- [NTSB ERA23LA180](https://openairdocs.org/ntsb/ERA23LA180), Apr 5, 2023: Cessna 421C (N880JS), Leesburg, VA, substantial damage. Probable cause: Separation of the left man landing gear scissor hardware, which resulted in a loss of directional control and subsequent runway excursion during landing.
- [NTSB WPR21FA270](https://openairdocs.org/ntsb/WPR21FA270), Jul 13, 2021: Cessna 421C (N678SW), Monterey, CA, destroyed, 2 fatal. Probable cause: The pilot’s failure to maintain airplane control due to spatial disorientation during an instrument departure procedure in instrument meteorological conditions which resulted in a collision with…
- [NTSB CEN21LA315](https://openairdocs.org/ntsb/CEN21LA315), Jul 10, 2021: Cessna 421C (N66NC), Longmont, CO, substantial damage. Probable cause: The loss of performance for reasons that could not be determined.
- [NTSB GAA19CA335](https://openairdocs.org/ntsb/GAA19CA335), Jun 9, 2019: Cessna 421 (N421WL), Moriarty, NM, substantial damage. Probable cause: The pilot's improper landing flare in gusting wind conditions, which resulted in a hard landing.
- [NTSB CEN19FA082](https://openairdocs.org/ntsb/CEN19FA082), Feb 15, 2019: Cessna 421 (N421NS), Canadian, TX, destroyed, 2 fatal. Probable cause: The pilot's failure to maintain control of the airplane while in instrument meteorological conditions with icing conditions present, which resulted in an aerodynamic stall and spin into terrain.
- [NTSB GAA17CA058](https://openairdocs.org/ntsb/GAA17CA058), Nov 5, 2016: Beech 58TC (N2CH), Valdosta, GA, substantial damage. Probable cause: The pilot’s failure to ensure that adequate fuel was onboard for the flight, which resulted in fuel exhaustion and the loss of engine power.
- [NTSB WPR16LA092](https://openairdocs.org/ntsb/WPR16LA092), Apr 13, 2016: Cessna 421C (N21SG), Death Valley, CA, substantial damage. Probable cause: A runway overrun for reasons that could not be determined based on the available information.
- [NTSB WPR13LA214](https://openairdocs.org/ntsb/WPR13LA214), May 1, 2013: Cessna 421A (N216WA), Oakland, CA, substantial damage. Probable cause: A failure of the left main landing gear pivot bolt in overstress during landing.
- [NTSB CEN10LA166](https://openairdocs.org/ntsb/CEN10LA166), Mar 18, 2010: Cessna 421B (N3382Q), Artesia, NM, substantial damage. Probable cause: A loss of engine power due to fuel starvation as a result of the pilot's improper fuel management.
- [NTSB NYC05LA116](https://openairdocs.org/ntsb/NYC05LA116), Jul 7, 2005: Cessna 421B (N318RF), Medina, OH, substantial damage. Probable cause: An overload failure of the left main landing gear attachment assembly.
- [NTSB FTW04FA243](https://openairdocs.org/ntsb/FTW04FA243), Sep 23, 2004: Cessna 421C (N729DM), Bee Caves, TX, destroyed, 2 fatal. Probable cause: The pilot's improper positioning of the fuel selector valves, which resulted in a loss of power to the left engine due to fuel exhaustion. After the power loss, the pilot failed to follow checklist…
- [NTSB DEN03FA025](https://openairdocs.org/ntsb/DEN03FA025), Dec 25, 2002: Cessna 421 (N421D), Akron, CO, destroyed, 2 fatal. Probable cause: The fractured connecting rods and the pilot not maintaining aircraft control following the engine failure. Factors contributing to the accident were the low altitude, the pilot not maintaining…
- [NTSB NYC02LA190](https://openairdocs.org/ntsb/NYC02LA190), Sep 15, 2002: Cessna 421 (N23RL), Ithaca, NY, substantial damage. Probable cause: The pilot's failure to maintain directional control during the landing roll. A factor in the accident was the wet runway.
- [NTSB CHI02LA100](https://openairdocs.org/ntsb/CHI02LA100), Apr 7, 2002: Piper PA-46-310P (N9184F), Hastings, MN, substantial damage. Probable cause: The engine failure due to oil starvation as a result of the fatigue fracture of the number 6 piston. Additional factors were the unsuitable terrain for landing encountered by the pilot, and the…
- [NTSB FTW01LA186](https://openairdocs.org/ntsb/FTW01LA186), Aug 17, 2001: Cessna 421B (N5286Z), New Braunfels, TX, substantial damage. Probable cause: the pilot's inadequate flare of the airplane resulting in a hard landing. A contributing factor was the crosswind.
- [NTSB MIA01FA140](https://openairdocs.org/ntsb/MIA01FA140), May 13, 2001: Cessna 404 (N404BA), Pena Pobre, PR, destroyed, 1 fatal. Probable cause: failure of the pilot-in-command to maintain altitude/clearance, resulting in an in-flight collision with rising terrain.
- [NTSB ATL01FA036](https://openairdocs.org/ntsb/ATL01FA036), Feb 14, 2001: Cessna 421 (N5AY), Munford, AL, destroyed, 5 fatal. Probable cause: The pilot continued visual flight into instrument weather conditions that resulted in the inflight collision with a river bank. Factors were reduced visibility and dark night.
- [NTSB FTW99LA012](https://openairdocs.org/ntsb/FTW99LA012), Oct 18, 1998: Cessna 421C (N19MH), Eagle Pass, TX, destroyed. Probable cause: A downdraft, which exceeded the aircraft's climb performance. A factor was the thunderstorms in the vicinity of the airport.
- [NTSB CHI98LA032](https://openairdocs.org/ntsb/CHI98LA032), Nov 7, 1997: Cessna 421A (N2957Q), Tomahawk, WI, substantial damage. Probable cause: the elevator trim tab bolt backed out, allowing the trim tab to flutter, and destroy the elevator. The factors involved were improper annual inspection by the maintenance personnel, and the…
- [NTSB LAX96LA296](https://openairdocs.org/ntsb/LAX96LA296), Aug 4, 1996: Cessna 421C (N6209V), Avalon, CA, substantial damage. Probable cause: the pilot's failure to initiate a go-around when a landing overshoot became apparent. Factors which contributed to the accident were: the pilot's excessive airspeed and misjudged distance during…
- [NTSB FTW96FA073](https://openairdocs.org/ntsb/FTW96FA073), Dec 21, 1995: Cessna 421C (N421EP), Cleveland, OK, destroyed, 6 fatal. Probable cause: the pilot's continued VFR flight into instrument meteorological conditions (IMC), and his failure to maintain control of the airplane after encountering adverse weather conditions, which resulted in…
- [NTSB LAX95FA319](https://openairdocs.org/ntsb/LAX95FA319), Sep 2, 1995: Cessna 421C (N6234G), Beaver Dam, AZ, destroyed, 8 fatal. Probable cause: Failure of the pilot to maintain adequate airspeed, while maneuvering on approach, which resulted in an inadvertent stall/spin and uncontrolled collision with terrain. Factors relating to the…
- [NTSB MIA95TA199](https://openairdocs.org/ntsb/MIA95TA199), Aug 10, 1995: Cessna 404 (N461MC), Raiford, FL, substantial damage. Probable cause: THE PILOT'S SELECTION OF UNSUITABLE TERRAIN FOR LANDING.
- [NTSB LAX87FA306](https://openairdocs.org/ntsb/LAX87FA306), Aug 16, 1987: Cessna 421C (N26596), Clifton, AZ, destroyed
- [NTSB DEN87FA016](https://openairdocs.org/ntsb/DEN87FA016), Nov 6, 1986: Cessna 421C (N421AR), Butte, MT, destroyed, 1 fatal
- [NTSB FTW85FA019](https://openairdocs.org/ntsb/FTW85FA019), Oct 18, 1984: Cessna 421C (N121BT), Addison, TX, destroyed, 1 fatal
- [NTSB CHI84LA135](https://openairdocs.org/ntsb/CHI84LA135), Mar 21, 1984: Cessna 421C (N260RA), Joliet, IL, substantial damage
- [NTSB DEN76DTM32](https://openairdocs.org/ntsb/DEN76DTM32), May 30, 1976: Cessna T210L (N2239S), Navajo Mtn, UT, substantial damage
- [NTSB DEN74DTC32](https://openairdocs.org/ntsb/DEN74DTC32), Apr 26, 1974: Cessna 421B (N5962M), Jeffrey City, WY, substantial damage

## FAA accident and incident reports (90, 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 20260608006519I](https://openairdocs.org/incident/20260608006519I), Jun 8, 2026: Cessna 404 (N80BS), Blaine, MN, Minor damage. The flight was planned as a routine IFR flight. During takeoff climb at approximately 2,300’ MSL, the pilot heard and felt an impact. He saw visible damage to…
- [Incident 20260605006829I](https://openairdocs.org/incident/20260605006829I), Jun 5, 2026: Cessna 421C (N438EL), Leesburg, FL, No damage. On departure roll from runway 13. The aircraft exited the runway approximately 200’ after departure roll with an immediate left turn into the grass, clear of…
- [Accident 20240831012899A](https://openairdocs.org/incident/20240831012899A), Aug 31, 2024: Cessna 421C (N421GP), Fairveiw, OR, Destroyed, 3 fatal. Portland, OR (ttd): [privacy data omitted], C421, after departing runway 25, aircraft attempted to return. [privacy data omitted] Crashed into town houses 2…
- [Accident 20231208021649A](https://openairdocs.org/incident/20231208021649A), Dec 8, 2023: Cessna 421C (N146TJ), Mcgregor, TX, Minor damage. Pilot departed act to 5C1 on IFR flight plan. During level off pilot experienced prop governor failure and RPM in excess of 4500. Attempted to return to…
- [Accident 20230405004459A](https://openairdocs.org/incident/20230405004459A), Apr 5, 2023: Cessna 421C (N880JS), Leesburg, VA, Substantial damage. 04/05/2020 – 1300 – Aircraft [privacy data omitted] veered off of runway 17 at kjyo upon landing. The aircraft experienced a left yaw as the main landing gear…
- [Incident 20211114019509I](https://openairdocs.org/incident/20211114019509I), Nov 14, 2021: Cessna 421C (N7245G), Palestine, IL, Minor damage. Pilot was in position for left downwind entry runway 27 at krsv in Palestine, IL and neglected to extend his landing gear for landing runway 27. The pilot…
- [Incident 20211013017529I](https://openairdocs.org/incident/20211013017529I), Oct 13, 2021: Cessna 421C (N3920C), Tulsa, OK, Minor damage. On October 13, 2021 at approximately 1007 local time, a Cessna 421C, registration N3920C landed without incident at richard l. jones, jr. airport (krvs) Tulsa,…
- [Accident 20210713010719A](https://openairdocs.org/incident/20210713010719A), Jul 13, 2021: Cessna 421C (N678SW), Monterey, CA, Destroyed, 2 fatal. Airman departed runway 10 at Monterey Regional Airport at 1038 PST. During the climb out aircraft flew into terrain at approximately 1042 PST. Pilot and…
- [Accident 20210710010559A](https://openairdocs.org/incident/20210710010559A), Jul 10, 2021: Cessna 421C (N66NC), Longmont, CO, Substantial damage. According to the PIC, the aircraft loaded 3 passengers and luggage. The fuel on board was 100 gallons. Aircraft was 900 pounds below mgw. N66NC taxied for…
- [Incident 20190814017689I](https://openairdocs.org/incident/20190814017689I), Aug 14, 2019: Cessna 421C (N942SW), Houston, TX, Minor damage. Houston, TX (iws): N942SW, 421C, iws, departing runway 33, veered off right side of runway, passed runway 15 and crashed into a ditch. No ATC svcs. POB: 1,…
- [Accident 20190609017389A](https://openairdocs.org/incident/20190609017389A), Jun 9, 2019: Cessna 421B (N421WL), Moriarity, NM, Substantial damage. On June 9, 2019, at 1210 MDT, a Cessna 421B registered to [privacy data omitted] sustained a hard landing at Moriarity municipal airport, Moriarity, new…
- [Accident 20190215010299A](https://openairdocs.org/incident/20190215010299A), Feb 15, 2019: Cessna 421C (N421NS), Canadian, TX, Destroyed, 2 fatal. On February 15, 2019, at 0957 central standard time, N421NS, a Cessna 421C airplane impacted terrain about 8 miles west of hemphill county airport (hhf),…
- [Accident 20161105018039A](https://openairdocs.org/incident/20161105018039A), Nov 5, 2016: Beech 58TC (N2CH), Nashville, GA, Substantial damage. On November 05, 2016, at approximately 1630 local time a Beechcraft baron aircraft model B58TC serial number TK-72 ?call sign? N2CH ran out of fuel made an…
- [Incident 20160704010639I](https://openairdocs.org/incident/20160704010639I), Jul 4, 2016: Cessna 421C (N369RM), Portsmouth, OH, Minor damage. The [privacy data omitted]pilot of N369RM was on an IFR flight plan from gatlinburg-pigeon forge airport (gkt) to Portsmouth regional airport (pmh). The pilot…
- [Accident 20160413021519A](https://openairdocs.org/incident/20160413021519A), Apr 13, 2016: Cessna 421C (N21SG), Death Valley, CA, Substantial damage. On April 13, 2016, at approximately 1115 (local), a Cessna 421C (N21SG), operating as a personal flight under CFR part 91, made a normal landing on runway 33…
- [Incident 20150905018069I](https://openairdocs.org/incident/20150905018069I), Sep 5, 2015: Cessna 421B (N241TS), Lincoln, CA, Substantial damage. Gear up landing
- [Incident 20150628010769I](https://openairdocs.org/incident/20150628010769I), Jun 28, 2015: Cessna 421C (N421HL), Grain Valley, MO, Minor damage. During the take-off roll on runway 27 at K3GV, the left main wheel veered off the runway at approximately the 1000 feet marker. The left aircraft tire tracked…
- [Incident 20150315004569I](https://openairdocs.org/incident/20150315004569I), Mar 15, 2015: Cessna 421C (N421GJ), North Las Vegas, NV, Minor damage. On March 15, 2015, at approximately 22:20 UTC time, while landing at the North Las Vegas Airport (vgt), a Cessna 421C aircraft with four souls onboard…
- [Incident 20141129022269I](https://openairdocs.org/incident/20141129022269I), Nov 29, 2014: Cessna 421C (N66CL), Larned, KS, Minor damage. N66CL was IFR at 10,000 ft at about 21:15 going from kmhk to kddc with 5 passengers on board. The left engine began running roughly and then quit within 20…
- [Incident 20140312002319I](https://openairdocs.org/incident/20140312002319I), Mar 12, 2014: Cessna 421C (N567WA), Dallas, TX, Minor damage. At approximately 08:54 EST a Cessna-421 c N567WA was reported to have a right hand main tire on fire, the aircraft was on the southwest pad approaching runway…
- [Incident 20140104004739I](https://openairdocs.org/incident/20140104004739I), Jan 4, 2014: Cessna 421C (N648SB), Liberal, KS, Minor damage. The pilot was the lone occupant in the aircraft returning to his home airport on a c.f. r. part 91 leg from a c.f.r. part 135 charter trip. The ceiling was…
- [Incident 20130728024949I](https://openairdocs.org/incident/20130728024949I), Jul 28, 2013: Cessna 421B (N37JK), Ardmore, OK, Minor damage. On first flight after aircraft and landing gear maintenance, right main landing gear collapsed after touchdown and rollout. Aircraft veered off runway onto…
- [Incident 20130709017229I](https://openairdocs.org/incident/20130709017229I), Jul 9, 2013: Cessna 421C (N2740B), Beverly, MA, Minor damage. On July 9, 2013, n 2740B executed the runway 16 GPS approach at the kbvy(Beverly Municipal Airport). The approach terminated in a landing on runway 16. At some…
- [Accident 20130501006279A](https://openairdocs.org/incident/20130501006279A), May 1, 2013: Cessna 421A (N216WA), Oakland, CA, Substantial damage. Cessna N216WA s/n 421A-0032. PIC - [privacy data omitted]. The airman reported the intended flight was to maintain IFR currency. Aircraft owner [privacy data…
- [Incident 20130108000159I](https://openairdocs.org/incident/20130108000159I), Jan 8, 2013: Cessna 421C (N4492U), Opa Locka, FL, No damage. On January 08, 2013, at approximately 08:30 am aircraft N4492U departed opf runway 12, for srq and climbed to 2000FT with no indication of any problems. After…
- [Incident 20120506007599I](https://openairdocs.org/incident/20120506007599I), May 6, 2012: Beech A36 (N43KT), Ontario, CA, No damage. Pilot declared emergency due to an unsafe gear indication. Aircraft landing safely. Trouble shot and found bad bulb. Removed and replaced bulb. No futher…
- [Incident 20120122000909I](https://openairdocs.org/incident/20120122000909I), Jan 22, 2012: Cessna 421B (N13HL), Camarillo, CA, Minor damage. After takeoff rotation, the forward left cargo door opened. The aircraft yawed to the right and began to slow. At this point the landing gear was already…
- [Incident 20101202054569I](https://openairdocs.org/incident/20101202054569I), Dec 2, 2010: Cessna 421C (N421CX), Provo, UT, No damage. On December 2, 2010 at approximately 1100 pm local, N421CX, a Cessna 421C, experienced a loss of power on the left engine while enroute from salt lake city, UT…
- [Accident 20100318029579A](https://openairdocs.org/incident/20100318029579A), Mar 18, 2010: Cessna 421B (N3382Q), Destroyed. On March 18, 2010, the pilot of N3382Q, a Cessna 421 aircraft, executed a go around at Artesia Municipal Airport (ats), Artesia, new Mexico. During the go…
- [Incident 20080323014269I](https://openairdocs.org/incident/20080323014269I), Mar 23, 2008: Cessna 421C (N878HC), Marathon, FL, Minor damage. (-23) Nose landing gear collapsed on take-off roll. Left and right propeller strike at 75% power setting.
- [Incident 20080201010729I](https://openairdocs.org/incident/20080201010729I), Feb 1, 2008: Cessna 421B (N628RJ), Refugio, TX, Minor damage. (-23) Pilot stated that after landing at about 1,000 ft on rollout the right landing gear collapsed. Minor damage to the aircraft. No NMAC, no fire, no damage…
- [Incident 20070326006769I](https://openairdocs.org/incident/20070326006769I), Mar 26, 2007: Cessna 421C (N421KA), Hickory, NC, Minor damage. (-23) Nose landing gear collapsed after aircraft had landed and was on roll out.
- [Incident 20060620015239I](https://openairdocs.org/incident/20060620015239I), Jun 20, 2006: Cessna 421A (N216WA), Columbus, OH, Minor damage. (-23) Aircraft N216WA was cleared to land on runway 28L at cmh. On landing rollout, PIC stated the left wing started to settle and dip. The left main gear…
- [Incident 20060518008529I](https://openairdocs.org/incident/20060518008529I), May 18, 2006: Cessna 421B (N421WL), San Martin, CA, Minor damage. (-23) The center torque linkage connecting bolt assy was not installed properly by maintenance personnel which resulted in the aircraft left main landing gear…
- [Incident 20060127004729I](https://openairdocs.org/incident/20060127004729I), Jan 27, 2006: Cessna 421B (N5443J), Panama City, FL, Minor damage. (-23) On January 7, 2006, at 09:15, CST. A Cessna-421B was involved in an incident. The Cessna's nose landing gear collapsed on landing. The pilot stated that…
- [Incident 20051102031209I](https://openairdocs.org/incident/20051102031209I), Nov 2, 2005: Cessna 421C (N6798V), Merrill, WI, Minor damage. (-23) Aircraft was departing runway 25 at rrl on IFR clearance. Deer appeared in front of aircraft to the left running to the right. The deer impacted the…
- [Accident 20050707016449A](https://openairdocs.org/incident/20050707016449A), Jul 7, 2005: Cessna 421B (N318RF), Medina, OH, Substantial damage. (-23) Aircraft departed 1G5 Medina municipal, Medina, Ohio for raliegh-durham, north carolina. Pilot noticed a high oil temperature and elected to go back to…
- [Incident 20050317004319I](https://openairdocs.org/incident/20050317004319I), Mar 17, 2005: Cessna 421C (N421GM), Bloomington-Nor, IL. (-23) On March 17, 2005 at about 11:18 CST the appropriately rated and qualified pilot departed runway 29 for a local part 91 flight. At about 1/2 mile off the…
- [Incident 20041014024449I](https://openairdocs.org/incident/20041014024449I), Oct 14, 2004: Cessna 421B (N421EL), Chino, CA. (-23) During climb to altitude, the right engine shut down. Aircraft returned to cno without incident. Maintenance discovered the right engine turbo charger…
- [Accident 20040923029829A](https://openairdocs.org/incident/20040923029829A), Sep 23, 2004: Cessna 421C (N729DM), Bee Cave, TX, Destroyed, 2 fatal. (-23) On September 23, 2004, aircraft N729DM, a Cessna 421C, S/N421C1101, was involved in an accident west of austin in Bee Cave, TX. The aircraft was inbound…
- [Incident 20040713016319I](https://openairdocs.org/incident/20040713016319I), Jul 13, 2004: Cessna 421A (N421MD), Henderson, NV. (-23) On July 13, 2004, aircraft N421MD, CE-421A departed maccarran international airport. The aircraft was piloted by marvin ray grimmet (ATP cert. #…
- [Incident 20031229033449I](https://openairdocs.org/incident/20031229033449I), Dec 29, 2003: Cessna 421B (N318RF), Marathon, FL, Minor damage. (-23) On December 30, 2003, inspector from this office investigated an accident/incident that occurred on December 29, 2003 at approximately 11:15AM at…
- [Incident 20031021029789I](https://openairdocs.org/incident/20031021029789I), Oct 21, 2003: Cessna 421C (N421ML), Springfield, IL. (-23) On 10-21-2003, while on a personal business flight the appropriately certificated and qualified pilot and sole occupant was flying from anderson, in to…
- [Accident 20021225034989A](https://openairdocs.org/incident/20021225034989A), Dec 25, 2002: Cessna 421 (N421D), Akron, CO, Destroyed, 2 fatal. (-23) The flight departed on an instrument flight rules (IFR) flight plan from centennial airport (apa) englewood, CO at 0933MST on December 25, 2002. At…
- [Accident 20020915037659A](https://openairdocs.org/incident/20020915037659A), Sep 15, 2002: Cessna 421C (N23RL), Ithaca, NY, Substantial damage. (-23) On Sunday, September 15, 2002 at 1947 EDT at the Tompkins County Airport (ith), Ithaca, NY, a CE-421-C aircraft, N23RL, piloted by rod lache, slid off…
- [Accident 20020407006299A](https://openairdocs.org/incident/20020407006299A), Apr 7, 2002: Piper PA46310P (N9184F), Hastings, MN, No damage. (-23) On April 7, 2002, at 1015 hours local time, a Piper PA-46-310P, owned by aerotech ltd, of greenville junction, ME, lost power while descending…
- [Accident 20010817031949A](https://openairdocs.org/incident/20010817031949A), Aug 17, 2001: Cessna 421B (N5286Z), Newbraunfels, TX, No damage. (-23) While attempting to land on rnwy 17 pilot changed his mind on short final to land on rnwy 13. Aircraft was in a steep right bank left of center line…
- [Incident 20010816025969I](https://openairdocs.org/incident/20010816025969I), Aug 16, 2001: Cessna 404 (N27SA), St Paul, MN, Minor damage. (-23) Airman stated that ATC told him to keep his speed up. Aircraft crossed runway threshold at approximately 130-140 KIAS and landed long. Right tire blew.…
- [Accident 20010513010939A](https://openairdocs.org/incident/20010513010939A), May 13, 2001: Cessna 404 (N404BA), San Juan, Puerto Rico, No damage. (-23)The aircraft was on a VFR flight from st. croix U.S. Virgin islands to San Juan Puerto Rico. Aircraft cruising altitude was 4,500 feet MSL until descend…
- [Incident 20010506012889I](https://openairdocs.org/incident/20010506012889I), May 6, 2001: Cessna 421B (N856A), Cedar Rapids, IA, Minor damage. (-23) The aircraft was enroute from greebay, Wisconsin, to olathe, Kansas, when the pilot noticed oil streaming from the cowling on the #1 engine. The pilot…

All 90: https://openairdocs.org/engine/continental-gtsio-520-series/incidents.md

## Service difficulty reports (69, newest 50)

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

- [SDR 2026FA0000316](https://openairdocs.org/sdr/2026FA0000316), May 3, 2026: INTAKE DUCT. LOOSE. ON 3 MAY 2026, APPROXIMATELY 11:55 AM, N123NP DEPARTED BIL FOR FBL AND FOUND THAT THE RIGHT ENGINE WOULDN'T MAKE RED LINE MAP AND ABORTED HIS TAKEOFF. MAINTENAN
- [SDR 2018FA0000313](https://openairdocs.org/sdr/2018FA0000313), Jul 31, 2018: ACTUATOR. FAILED. NOSE GEAR COLLAPSED DURING NORMAL LANDING, NOSE GEAR ACTUATOR FAILED - UNLOCKED.
- [SDR 2016FA0000226](https://openairdocs.org/sdr/2016FA0000226), May 10, 2016: ALTERNATOR. FAILED. RIGHT ALTERNATOR FAILED. PULLED OFF THE ALTERNATOR AND FOUND BROKEN ALTERNATOR SHAFT 1" OTBD OF DRIVE COUPLING. CAME OFF ENGINE FROM ACFT.
- [SDR 2015FA0000556](https://openairdocs.org/sdr/2015FA0000556), Nov 9, 2015: INTAKE VALVE. FAILED. PILOT REPORTED A VIBRATION IN THE LT ENGINE AND MADE A PRECAUTIONARY LANDING. UPON INVESTIGATION IT WAS FOUND THAT THE LT ENGINE HAD DROPPED AN INTAKE VALVE AND
- [SDR 2014F00141](https://openairdocs.org/sdr/2014F00141), Jul 31, 2014: ADAPTER. FAILED. DURING INSPECTION, AFTER ENGINE INFLIGHT SHUTDOWN FOUND THE RT ENGING STARTER ADAPTER GEAR SPLINES WERE DAMAGED CAUSING FURTHER DAMAGE TO THE CRANK SHAFT DRIVE 
- [SDR 2014FA0000266](https://openairdocs.org/sdr/2014FA0000266), Apr 23, 2014: NUT. MISSING. RT ENGINE NR 5 CYLINDER WAS DETERMINED TO HAVE 4 CYLINDER HOLD DOWN NUTS MISSING. UNABLE TO DETERMINE THE CAUSE. ENGINE REMOVED AND SENT OUT FOR REPAIR.
- [SDR HLF2013F00000](https://openairdocs.org/sdr/HLF2013F00000), Mar 29, 2013: CYLINDER. SEPARATED. DURING FLIGHT, ENGINE HAD A SMALL VIBRATION, FOLLOWED BY A LOUD NOISE, PILOT SHUT ENGINE DOWN AND SAFETY LANDED. INITIAL INSPECTION SHOWED RT ENGINE NR 5 CYLIND
- [SDR 2012FA0000672](https://openairdocs.org/sdr/2012FA0000672), Oct 2, 2012: ENGINE. POWER LOSS. DURING A FINAL APPROACH, PILOT APPLIED THROTTLE TO ARREST HIS SINK RATE BUT THE ENGINE DID NOT RESPOND. POST ACCIDENT INVESTIGATION REVEALED AT LEAST 5 GALLONS 
- [SDR 2012FA0000644](https://openairdocs.org/sdr/2012FA0000644), Sep 21, 2012: GOVERNOR. PRESSURE LOSS. ON CLIMB OUT AFTER TAKEOFF, AT APPROXIMATELY 500 FT AGL, THE RT ENGINE PROPELLER WENT TO A FULL FEATHER. ENGINE SHUTDOWN AUTOMATICALLY AND ONE ATTEMPT TO RESTAR
- [SDR 2012FA0000246](https://openairdocs.org/sdr/2012FA0000246), Mar 22, 2012: GASKET. FAILED. OIL FILLER CAP GASKET ON ENGINE. HAVE REPLACED THE GASKET TWO TIMES DUE TO DISTORTION AND TORN. GASKET MATERIAL LACKS STABILITY FOR THE TWISTING FORCE IT IS SUB
- [SDR 2012FA0000321](https://openairdocs.org/sdr/2012FA0000321), Mar 5, 2012: CRANKCASE. CRACKED. ON COMLETION OF A ROUTINE INSPECTION, A CRACKED ENGINE CASE STARTING AT NR 5 CYLINDER AND REARWARD 2.5"
- [SDR 2010FA0000426](https://openairdocs.org/sdr/2010FA0000426), Apr 23, 2010: CONTROL CABLE. LOOSE. THE CONTROL CABLE FOR THE RUDDER WAS UNDER TENSIONED AND THE FAIR LEAD MISSING AT FUSELAGE STA 289.94 CAUSING THE CONTROL CABLE TO SAW INTO THE BULKHEAD .1250" 
- [SDR 2010FA0000274](https://openairdocs.org/sdr/2010FA0000274), Mar 9, 2010: CLAMP. CRACKED. DURING AN ANNUAL INSP, THE CLAMP BETWEEN THE TURBO AND EXHAUST OVERBOARD ON THE LT ENGINE WAS FOUND WITH A 4.5 IN CRACK ALONG THE CIRCUMFERENCE.
- [SDR TR7A090918001](https://openairdocs.org/sdr/TR7A090918001), Sep 18, 2009: CRANKCASE. CRACKED. 1.5" CRACK ON TOP INBD SECTION OF CRANKCASE BETWEEN NR 3 AND NR 5 CYLINDERS. CRACK IS IN "NON-CRITICAL" AREA AND LESS THAN THE MAXIMUM ALLOWABLE LIMIT AS SPECIF
- [SDR 2009FA0000891](https://openairdocs.org/sdr/2009FA0000891), Apr 30, 2009: CRANKSHAFT. BROKEN. RECEIVED ENGINE INTO DISASSY SHOP ON 4/30/09. SMOH: 246.7- POSSIBLY NR 5 CYLINDER NOT TORQUED PROPERLY (MAINTENANCE AFTER O/H). CRANKSHAFT BROKEN AT NR 3 MAIN J
- [SDR 2009FA0000842](https://openairdocs.org/sdr/2009FA0000842), Jan 20, 2009: CYLINDER. CRACKED. ECI REPAIRED CYLINDER FOUND TO BE CRACKED
- [SDR BXS2008F00000](https://openairdocs.org/sdr/BXS2008F00000), Dec 9, 2008: LANDING GEAR. MALFUNCTIONED. MLG WOULD NOT RETRACT AFTER TAKEOFF. VISUALLY INSPECTED MLG SYS & FOUND NO DAMAGE. JACKED ACFT. PILOT CONFIRMED THAT 3 GREEN LIGHTS REMAINED ON, TRANSIT/WARMING
- [SDR FIS2008F00000](https://openairdocs.org/sdr/FIS2008F00000), Jun 4, 2008: FITTING. CRACKED. THE COLLAR HAS A CRACK WHERE THE TAPER PIN GOES THROUGH. POSSIBLE SOMEONE OVER TORQUED THE TAPER PIN. (K)
- [SDR 2007FA0001053](https://openairdocs.org/sdr/2007FA0001053), Nov 30, 2007: LOCK PLATE. MISSING. THIS ENGINE WAS REMOVED ON AUGUST 31, 2007, HOBBS TIME 1523.9 DUE TO CRACKED ENGINE CASE. THE ENGINE WAS SENT TO RAM AIRCRAFT FOR REPAIR. RAM REPAIRED THE ENGIN
- [SDR 2007FA0000872](https://openairdocs.org/sdr/2007FA0000872), Jul 19, 2007: SKIN. CORRODED. LT AND RT WING UPPER SKINS UNDER THE NACELLE FUEL BLADDER TANKS HAD CORROSION PRESENT TO THEM AND RELATED AREA AROUND THE BLADDER BAYS. WO NR 10688. (K)
- [SDR 2007FA0000536](https://openairdocs.org/sdr/2007FA0000536), May 30, 2007: LINE. CORRODED. DURING INSPECTION, HEARD A FAINT GAS LEAK IN OVERHEAD. PULLED O2 OUTLETS IN SUSPECTED AREA, AND CHECKED B-NUTS, ALL SECURE. PULLED HEADLINER FOR A CLOSER INSPEC
- [SDR M1144](https://openairdocs.org/sdr/M1144), Feb 8, 2007: EXHAUST VALVE. BROKEN. PILOT REPORTED THAT RT ENGINE WAS RUNNING ROUGH IN FLIGHT. HE DID NOT SHUTDOWN ENGINE. FOUND NO COMPRESSION IN NR 5 CYLINDER ON RT ENGINE. REMOVED CYLINDER AND 
- [SDR 2006FA0000961](https://openairdocs.org/sdr/2006FA0000961), Sep 19, 2006: CRANKCASE. LEAKING. POROSITY IN CRANKCASE NOSE SECTION ON THE RT SIDE BY THE OIL GALLEY PLUG. LEAKS OIL, MFG HAS BEEN NOTIFIED. (K)
- [SDR 2006FA0000962](https://openairdocs.org/sdr/2006FA0000962), Sep 19, 2006: CRANKCASE. LEAKING. POROSITY IN CRANKCASE NOSE SECTION ON THE RT SIDE BY THE OIL GALLEY PLUG. LEAKS OIL. MFG HAS BEEN NOTIFIED. (K)
- [SDR 2006FA0000908](https://openairdocs.org/sdr/2006FA0000908), Aug 17, 2006: SWITCH. FOULED. LANDING GEAR WOULD NOT EXTEND ELECTRICALLY UPON APPROACH TO RFD. MANUAL EXTENSION OPERATIONS NORMAL. TROUBLESHOT LANDING GEAR ELECTRICAL SYS. FOUND S45 LANDING 
- [SDR 2006FA0000821](https://openairdocs.org/sdr/2006FA0000821), Jul 26, 2006: HINGE. CORRODED. TO FIND USED SERVICEABLE HINGES AND HINGE SUPPORT FITTINGS FROM AC SALVAGE COMPANIES, EVERY HINGE THAT WAS RECEIVED, SAME TYPE OF CORROSION, BEARING AND BUSHING
- [SDR 2007FA0000198](https://openairdocs.org/sdr/2007FA0000198), Jul 26, 2006: BOLT. CORRODED. DURING ACCOMPLISHMENT OF ANNUAL INSPECTION, EXCESSIVE PLAY WAS NOTED AT AFT HINGE POINT OF UPPER MAIN CABIN DOOR. INVESTIGATION REVEALED THAT HINGE BOLT WAS BRO
- [SDR 000](https://openairdocs.org/sdr/000), Mar 31, 2006: BOLT. DEPARTED. WHILE TAXING TO PARK THE RT MLG LINK ASSEMBLY BOLT CAME OUT CAUSING THE UPPER AND LOWER LINKS TO SEPERATE. THE RT LANDING GEAR TURNED 90 DEGREES BENDING THE GEA
- [SDR 2006FA0000029](https://openairdocs.org/sdr/2006FA0000029), Dec 6, 2005: DISTRIBUTOR GEAR. STRIPPED. PILOT REPORTED LT ENGINE RUNNING ROUGH. TROUBLESHOT PROBLEM TO LT MAGNETO. FOUND TEETH ON DISTRIBUTOR GEAR IN LT MAGNETO STRIPPED AND NOT TURNING PROPERLY. (GL2
- [SDR OEJ2005F00000](https://openairdocs.org/sdr/OEJ2005F00000), Oct 25, 2005: LANDING GEAR. FAILED. AFTER LANDING, DURING ROLL OUT THE LT MLG FOLDED UP. BEFORE LANDING, ON FINAL APPROACH. THE GEAR WAS VERIFIED BY BOTH PILOTS THAT THE GEAR WAS DOWN AND LOCK WIT
- [SDR 2005FA0001556](https://openairdocs.org/sdr/2005FA0001556), Oct 10, 2005: ROD END. FAILED. ROD END ON NOSE GEAR ACTUATOR FAILED DURING ROLLOUT CAUSING THE NOSE GEAR TO COLLAPSE. (K)
- [SDR 2005FA0001313](https://openairdocs.org/sdr/2005FA0001313), Sep 19, 2005: BELLCRANK. CRACKED. PILOT SAID PRESSURE REQUIRED TO MOVE RUDDER PEDALS WAS NOT NORMAL ON PREFLIGHT INSPECTION. NOSE GEAR STEERING BELLCRANK WAS CRACKED THROUGH AND BROKEN APART ON 
- [SDR 2005FA0001314](https://openairdocs.org/sdr/2005FA0001314), Sep 19, 2005: BELLCRANK. CRACKED. PILOT SAID PRESSURE REQUIRED TO MOVE RUDDER PEDALS WAS NOT NORMAL ON PREFLIGHT INSPECTION. NOSE GEAR STEERING BELLCRANK WAS CRACKED THROUGH AND BROKEN APART ON 
- [SDR 2005FA0001259](https://openairdocs.org/sdr/2005FA0001259), Sep 1, 2005: ADAPTER. DAMAGED. METAL IN ENGINE. STARTER ADAPTER, CRANK GEAR HAD TEETH MISSING. SB WAS NEVER C/W. (K)
- [SDR TZR2005F00021](https://openairdocs.org/sdr/TZR2005F00021), Jun 10, 2005: CYLINDER. CRACKED. CRACK IS TYPICAL FOR THESE CYLINDERS, LT NR 3, (SW05200509362). (K)
- [SDR 2005FA0001065](https://openairdocs.org/sdr/2005FA0001065), Apr 14, 2005: ANTENNA. INOPERATIVE. FOUND UPPER UAT ANTENNA UNSERVICEABLE. (K)
- [SDR 2005FA0000128](https://openairdocs.org/sdr/2005FA0000128), Dec 22, 2004: CRANKCASE. CRACKED. ENGINE CASE CRACK BY NR 3 FORWARD CYLINDER UPPER THROUGH BOLT RADIATING DOWNWARD SEVERAL INCHES. AD ADDRESSES THIS PROBLEM, BUT THESE MODEL NR ENGINE ARE NOT IN
- [SDR 2005FA0000755](https://openairdocs.org/sdr/2005FA0000755), Dec 20, 2004: ROCKER. BROKEN. ENGINE BECAME ROUGH IN FLIGHT ENGINE SHUTDOWN FOUND RT ENGINE NR 1 CYLINDER EXHAUST ROCKER ARM BROKEN. (K)
- [SDR 2005FA0000092](https://openairdocs.org/sdr/2005FA0000092), Nov 17, 2004: INTAKE VALVE. BROKEN. INTAKE VALVE IN NR 4 CYLINDER FAILED IN FLIGHT. THE VALVE FACE BROKE IN 3 PIECES. THE QUILL SHAFT BROKE AND SHUTDOWN THE ENGINE. THIS IS 3RD ONE SEEN WITH 400-5
- [SDR 2005FA0000704](https://openairdocs.org/sdr/2005FA0000704), Nov 12, 2004: MAIN BEARING. DELAMINATED. NR 3 MAIN BEARING APPEARED TO DELAMINATE. ALL THE BRASS OR BRONZE SEPARATED FORM THE BEARING SHELL. THE CRANKSHAFT, NR 3 JOURNAL DOES NOT SHOW SIGNS OF OIL STAR
- [SDR 2005FA0000677](https://openairdocs.org/sdr/2005FA0000677), Nov 10, 2004: MAIN BEARING. DELAMINATED. BEARING CRACKED AND DELAMINATED IN NR2 MAIN BEARING SADDLE. HEATED CRACKS IN NR2 MAIN JOURNAL. THIS HAS BEEN NOTED ON OTHER ENGINES WE HAVE DISASSEMBLED. BEARIN
- [SDR 2004FA0000419](https://openairdocs.org/sdr/2004FA0000419), Apr 6, 2004: CYLINDER. CRACKED. RAM AIRCRAFT HAS FOUND NUMEROUS CYLINDERS WITH LOW HOURS CRACKED IN AN AREA EXTENDING FROM FUEL INJECTOR BOSS AREA TO THE SPARK PLUG HOLE. IN THIS AREA IS A MAC
- [SDR 2004FA0000297](https://openairdocs.org/sdr/2004FA0000297), Feb 6, 2004: DETECTOR. INOPERATIVE. THIS NEWLY OVERHAULED DETECTOR WAS INSTALLED AND OPS CHECKED AFTER A COUPLE OF CHECKS THE STALL HORN WILL STAY ON. RETURNED UNIT FOR ANOTHER O/HED DETECTOR. THI
- [SDR 2004FA0000069](https://openairdocs.org/sdr/2004FA0000069), Dec 23, 2003: EXHAUST RISER. DAMAGED. WHILE IN IFR FLIGHT, PILOT REPORTED LOSS OF MANIFOLD PRESSURE AND EXHAUST GAS TEMPERATURE INSTRUMENTATION READINGS. HOWEVER MP STABILIZED AT LOWER THAN NORMAL R
- [SDR 421C111003DG](https://openairdocs.org/sdr/421C111003DG), Nov 12, 2003: CYLINDER. WORN. ON ENGINE START-UP, REAR PASSENGERS NOTED GREATER THAN USUAL SMOKE EMITTED FROM EXHAUST ON NR 1 ENGINE. THE PILOT SHUT DOWN AND PERFORMED A VISUAL INSPECTION OF
- [SDR HLF2003F00001](https://openairdocs.org/sdr/HLF2003F00001), Oct 6, 2003: CRANKCASE. CRACKED. CRACKED CRANKCASE AT NR 7 STUD, BETWEEN CYLINDERS NR 1 AND NR 3. CRACK IS ON CRITICAL AREA AND EXCEEDS THE MAX ALLOWED IAW SBM 90-17. PROBABLE CAUSE: OVERTORQUE
- [SDR CMI2003F00000](https://openairdocs.org/sdr/CMI2003F00000), Mar 20, 2003: B-NUT. UNDERTORQUED. NR 2 ENGINE STARTED RUNNING ROUGH. PILOT LANDED AND HAD PROBLEM CHECKED. NR 5 CLYINDER FUEL INJECTOR LWE B-NUT WAS LOOSE ON INJECTOR DUE TO IMPROPER TORQUE DURN
- [SDR 2003FA0000305](https://openairdocs.org/sdr/2003FA0000305), Mar 19, 2003: PUMP. SHEARED. ENGINE QUIT DURING TAKEOFF. THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED. INVESTIGATION REVEALED A SHEARED DRIVE SHAFT FOR THE ENGINE DRIVEN FUEL PUMP (INJECTOR PUMP)
- [SDR IBUA121E](https://openairdocs.org/sdr/IBUA121E), Mar 19, 2003: RESERVOIR. LEAKING. DURING INSPECTION OF AIRCRAFT, FOUND SIGHT TUBE ON HYDRAULIC RESERVOIR TO BE LEAKING, REPLACED WITH NEW. AFTER A FEW DAYS THE AIRCRAFT WAS STILL IN INSPECTION A
- [SDR 2002FA0001301](https://openairdocs.org/sdr/2002FA0001301), Nov 6, 2002: HUB. CRACKED. DURING NOSE TIRE CHANGE, DEGREASING OF WHEEL AND HUB, THREE CRACKS WERE FOUND ON CENTER HUB WHERE END PLATES BOLT TO HUB. WHEEL ASSEMBLY WAS PREVIOUSLY PAINTED 

All 69: https://openairdocs.org/engine/continental-gtsio-520-series/reports.md

## STCs that may be installed (OpenAirDocs) (32)

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 SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd. Lists GTSIO-520-C
- [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc. Lists GTSIO-520-C
- [STC SE03309CH](https://openairdocs.org/stc/SE03309CH): Installation of Engine Preheat Kit, p/n TSP6CYL-2927-115 for 115 volt application. Hartzell Propeller Inc. Lists GTSIO-520-C
- [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. Lists GTSIO-520-C
- [STC SE2340SW](https://openairdocs.org/stc/SE2340SW): Installation of modified cylinder assemblies, barrels, piston, and repaired crankcases. Continental Motors, Inc. Lists GTSIO-520-C
- [STC SE34WE](https://openairdocs.org/stc/SE34WE): Installation of Electro-Coatings, Inc., piston rings on Continental pistons. Continental Motors, Inc. Lists GTSIO-520-C
- [STC SE5820SW](https://openairdocs.org/stc/SE5820SW): Installation of Airmotive exhaust valve, P/N AEC-637781. Continental Motors, Inc
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc
- [STC SE3330NM](https://openairdocs.org/stc/SE3330NM): Continental valve cover gasket. Real Gaskets Tennessee. Lists GTSIO-520-C
- [STC SE00754DE](https://openairdocs.org/stc/SE00754DE): Installation of an auxiliary oil sump port on the oil sump pan. Oilamatic, Inc. Lists GTSIO-520-D
- [STC SE5726SW-D](https://openairdocs.org/stc/SE5726SW-D): Installation of Floscan - 20lb or - 203b fuel flow transducers. RAM Aircraft Limited Partnership. Lists GTSIO-520-D
- [STC SE3767SW-D](https://openairdocs.org/stc/SE3767SW-D): Installation of induction hose clamps. RAM Aircraft Limited Partnership. Lists GTSIO-520-D
- [STC SE612GL](https://openairdocs.org/stc/SE612GL): Installation of a Shadin Company fuel flow transducer. Shadin Avionics. Lists GTSIO-520-C
- [STC SE1780NM](https://openairdocs.org/stc/SE1780NM): Installation of Precise Flight standby vacuum system (SVS III). Precise Flight Inc. Lists GTSIO-520-C
- [STC SE5726SW](https://openairdocs.org/stc/SE5726SW): Installation of Floscan -201b or -203b fuel flow transducers. RAM Aircraft Limited Partnership. Lists GTSIO-520-D
- [STC SE5743NM](https://openairdocs.org/stc/SE5743NM): Intallation of adapter for externally mounted oil filter. Aviation Development Corporation. Lists GTSIO-520-C
- [STC SE09963SC](https://openairdocs.org/stc/SE09963SC): Installation of modified fuel injector nozzles. General Aviation Modifications, Inc. Lists GTSIO-520-D
- [STC SE3767SW](https://openairdocs.org/stc/SE3767SW): Installation of induction hose clamps. RAM Aircraft Limited Partnership. Lists GTSIO-520-D
- [STC SE4591SW](https://openairdocs.org/stc/SE4591SW): Installation of RAM magneto pressurization system. RAM Aircraft Limited Partnership. Lists GTSIO-520-D
- [STC SE8338SW](https://openairdocs.org/stc/SE8338SW): Install locknuts on cylinder attachment studs and thru-bolts, and install 6 additional cylinder attachment studs onto engine crankcases. RAM Aircraft Limited Partnership
- [STC SE09513SC](https://openairdocs.org/stc/SE09513SC): Installation and usage of Exxon 20W50 Multigrade aircraft engine oil conforming to Exxon Oil Formulation WS-3013. Exxon Company USA
- [STC SE00577NY](https://openairdocs.org/stc/SE00577NY): Installation of Canadian Aero Mfg. (C.A.M.) Oil Coolers. Canadian Aero Manufacturing. Lists GTSIO-520-L
- [STC SE00350SE](https://openairdocs.org/stc/SE00350SE): Installation of sump mounted chip detector. Aviation Development Corporation. Lists GTSIO-520-C
- [STC SE09058SC](https://openairdocs.org/stc/SE09058SC): Remove cylinder assembly, fuel nozzles, induction tubes, and injector air reference system and add corresponding parts from GTSIO-520-L engine. Texas Skyways Inc. Lists GTSIO-520-D
- [STC SE09059SC](https://openairdocs.org/stc/SE09059SC): Remove cylinder assembly, fuel nozzles, induction tubes, and injector air reference system and add corresponding components from GTSIO-520-L engine. Texas Skyways Inc. Lists GTSIO-520-H
- [STC SE1004SW](https://openairdocs.org/stc/SE1004SW): Installation of alternator braces. Signature Flight Support Corporation. Lists GTSIO-520-C
- [STC SE452NE](https://openairdocs.org/stc/SE452NE): Installation and usage of 'Mobil AV 1' aviation oil. Mobil Research & Development Corp
- [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
- [STC SE1447SO](https://openairdocs.org/stc/SE1447SO): Installation of GTSIO-520-C induction system, fuel injection system, oil cooler, oil filter, turbo- charger, exhaust system and related parts, and derate the power and per- formance to the GTSIO-520-C power. South Florida Aircraft Sales & Leasing, Inc. Lists GTSIO-520-M
- [STC SE74WE](https://openairdocs.org/stc/SE74WE): BG-341 spark plug as eligible for installation on listed Continental engines. Lewis Leibee. Lists GTSIO-520-C
- [STC SE12GL](https://openairdocs.org/stc/SE12GL): Installation of oil filler cap. Ray Whyte Electric Products Co. Lists GTSIO-520-C
- [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 GTSIO-520-C

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