# Allison 250-C20 series

- Type: Engine model (FAA registry)
- Registry code: 03020
- Manufacturer (registry): ALLISON
- Model: 250-C20 SER
- Engine type: Turbo-prop
- Power: 420 hp
- Data sheet: [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs)
- Holder: Rolls-Royce Corporation
- Installed in: 530 registered aircraft
- Page: https://openairdocs.org/engine/allison-250-c20-series

The registry names only the engine series, so ADs for every model in the series are matched.

## 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 2022-10-06](https://openairdocs.org/ad/2022-10-06): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20C (T63-A-720) and 9 more. Effective Jun 28, 2022
- [AD 2018-13-01](https://openairdocs.org/ad/2018-13-01): Turbine Governor · Rolls-Royce 250-C10 (T63-A-5), 250-C18, 250-C18A and 24 more. Effective Aug 16, 2018
- [AD 2006-16-04](https://openairdocs.org/ad/2006-16-04): Inspection of the fuel nozzle screen · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Sep 7, 2006
- [AD 2006-13-06](https://openairdocs.org/ad/2006-13-06): Gas producer rotor assembly tie bolts · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 16 more. Effective Jul 26, 2006
- [AD 2005-10-13](https://openairdocs.org/ad/2005-10-13): Turbine energy absorbing ring · Rolls-Royce 250-B17B, 250-B17C, 250-B17D and 7 more. Effective Jun 22, 2005
- [AD 2004-26-09](https://openairdocs.org/ad/2004-26-09): Compressor Adaptor Couplings · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 8 more. Effective Feb 8, 2005
- [AD 2001-24-12](https://openairdocs.org/ad/2001-24-12): Helical Torquemeter Gearshaft Assembly · Rolls-Royce 250-B17, 250-B17C, 250-B17D and 13 more. Effective Dec 19, 2001
- [AD 98-24-28](https://openairdocs.org/ad/98-24-28): Main Fuel Control Bellows · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 36 more. Effective Jan 7, 1999
- [AD 96-19-01](https://openairdocs.org/ad/96-19-01): Superior Air Parts Manufacture Approval (PMA) Bearings · Rolls-Royce 250-B15G, 250-B17F, 250-B17F/1 and 17 more. Effective Sep 26, 1996
- [AD 93-25-05](https://openairdocs.org/ad/93-25-05): Driveshaft Flex Coupling Bolts, Bushings, and Nuts · Rolls-Royce 250-C20S with STC SE2352NM. Effective Feb 22, 1994
- [AD 88-17-01](https://openairdocs.org/ad/88-17-01): Fuel Controls · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 26 more. Effective Mar 1, 1989
- [AD 83-03-02 R1](https://openairdocs.org/ad/83-03-02-R1): Slotted Third Stage Turbine Wheels · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 5 more. Effective Feb 28, 1984
- [AD 82-24-05](https://openairdocs.org/ad/82-24-05): Control Assembly and Power Turbine Governor Assembly · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Nov 26, 1982
- [AD 82-13-03](https://openairdocs.org/ad/82-13-03): Modify Engine High Pressure Fuel Control Filter Assembly · Rolls-Royce 250-C20 and 250-C20B. Effective Jul 1, 1982
- [AD 79-21-01 R1](https://openairdocs.org/ad/79-21-01-R1): Third Stage Turbine Wheel Blade · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 3 more. Effective Jun 3, 1981
- [AD 78-14-08](https://openairdocs.org/ad/78-14-08): Fuel Pump Drive Spline · Rolls-Royce 250-C18, 250-C18A, 250-C18B and 3 more. Effective Oct 24, 1979
- [AD 77-15-12](https://openairdocs.org/ad/77-15-12): Power Turbine Coupling Nut · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 23 more. Effective Sep 23, 1977
- [AD 77-09-08](https://openairdocs.org/ad/77-09-08): Bleed Valve Diaphragm · Rolls-Royce 250-B17, 250-B17B, 250-C20 and 2 more. Effective Jul 18, 1977
- [AD 74-14-03](https://openairdocs.org/ad/74-14-03): Fuel Control Rigging · Rolls-Royce 250-C20. Effective Jul 10, 1974
- [AD 73-19-07](https://openairdocs.org/ad/73-19-07): Turbine Governor-To-Fuel Control Tube · Rolls-Royce 250-C20. Effective Sep 14, 1973
- [AD 72-03-06](https://openairdocs.org/ad/72-03-06): Turbine Wheels · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 9 more. Effective Feb 8, 1972

Historical (superseded or no longer in force):

- [AD 2017-18-14](https://openairdocs.org/ad/2017-18-14) (historical): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20F and 8 more. Effective Oct 13, 2017
- [AD 2015-02-22](https://openairdocs.org/ad/2015-02-22) (historical): Repetitive visual inspections · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 15 more. Effective Mar 9, 2015
- [AD 2012-14-06](https://openairdocs.org/ad/2012-14-06) (historical): Released turbine blades and shrouds · Rolls-Royce 250-C20, 250-C20B and 250-C20R/2. Effective Aug 14, 2012
- [AD 2004-24-09](https://openairdocs.org/ad/2004-24-09) (historical): Fuel nozzle · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 40 more. Effective Jan 5, 2005
- [AD 2001-20-51](https://openairdocs.org/ad/2001-20-51) (historical): Helical Torquemeter Gearshaft Assembly · 250-B17, 250-B17C, 250-B17D and 12 more

## Information bulletins (advisory) (1)

- [SAIB CE-01-10](https://openairdocs.org/saib/CE-01-10): . Issued Jan 24, 2001

## Registered aircraft (530, first 50)

- [N100LM](https://openairdocs.org/aircraft/N100LM): [Haddock Flying Service Inc](https://openairdocs.org/faa-owner/HADDOCK%20FLYING%20SERVICE%20INC), [Salters, SC](https://openairdocs.org/faa-place/SC/Salters), S/N 1583
- [N101CH](https://openairdocs.org/aircraft/N101CH): [Tri-State Vegetation Management LLC](https://openairdocs.org/faa-owner/TRI-STATE%20VEGETATION%20MANAGEMENT%20LLC), [Vevay, IN](https://openairdocs.org/faa-place/IN/Vevay), S/N 1000829D
- [N101MZ](https://openairdocs.org/aircraft/N101MZ): [Bohonis David C](https://openairdocs.org/faa-owner/BOHONIS%20DAVID%20C), North Delta, built 1980, S/N 5045, Non-citizen corporation, flight hours not reported
- [N102CG](https://openairdocs.org/aircraft/N102CG): [Surprise, AZ](https://openairdocs.org/faa-place/AZ/Surprise), built 1998, S/N LNO85, Sale reported, pending cancellation
- [N102UM](https://openairdocs.org/aircraft/N102UM): [Timberland Helicopters Inc](https://openairdocs.org/faa-owner/TIMBERLAND%20HELICOPTERS%20INC), [Ashland, OR](https://openairdocs.org/faa-place/OR/Ashland), built 1981, S/N 5075
- [N105JD](https://openairdocs.org/aircraft/N105JD): [Havens Aviation LLC](https://openairdocs.org/faa-owner/HAVENS%20AVIATION%20LLC), [Blacklick, OH](https://openairdocs.org/faa-place/OH/Blacklick), built 1973, S/N 1105
- [N105LC](https://openairdocs.org/aircraft/N105LC): [Centerline Holdings Inc](https://openairdocs.org/faa-owner/CENTERLINE%20HOLDINGS%20INC), [Camden, DE](https://openairdocs.org/faa-place/DE/Camden), built 1988, S/N S789
- [N105SU](https://openairdocs.org/aircraft/N105SU): [Signature Property Holdings LLC](https://openairdocs.org/faa-owner/SIGNATURE%20PROPERTY%20HOLDINGS%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1988, S/N 800776D
- [N1075W](https://openairdocs.org/aircraft/N1075W): [San Juan Aviation LLC](https://openairdocs.org/faa-owner/SAN%20JUAN%20AVIATION%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1980, S/N 45377
- [N1076G](https://openairdocs.org/aircraft/N1076G): [Henderson Aviation Co](https://openairdocs.org/faa-owner/HENDERSON%20AVIATION%20CO), [Junction City, OR](https://openairdocs.org/faa-place/OR/Junction%20City), built 1979, S/N 2831
- [N107GG](https://openairdocs.org/aircraft/N107GG): [Carbon River Helicopter Services LLC](https://openairdocs.org/faa-owner/CARBON%20RIVER%20HELICOPTER%20SERVICES%20LLC), [Lexington, KY](https://openairdocs.org/faa-place/KY/Lexington), built 1980, S/N 2917
- [N107PH](https://openairdocs.org/aircraft/N107PH): [Southern Helicopter Service Inc](https://openairdocs.org/faa-owner/SOUTHERN%20HELICOPTER%20SERVICE%20INC), [Millington, TN](https://openairdocs.org/faa-place/TN/Millington), built 1979, S/N 2789
- [N1081K](https://openairdocs.org/aircraft/N1081K): [Marks Aviation Group LLC](https://openairdocs.org/faa-owner/MARKS%20AVIATION%20GROUP%20LLC), [Lafayette, LA](https://openairdocs.org/faa-place/LA/Lafayette), built 1980, S/N 45407
- [N109CY](https://openairdocs.org/aircraft/N109CY): [O'Brien Derrick P](https://openairdocs.org/faa-owner/O'BRIEN%20DERRICK%20P), [Middletown, DE](https://openairdocs.org/faa-place/DE/Middletown), S/N 7351
- [N109MM](https://openairdocs.org/aircraft/N109MM): [Airborne Leasing Inc](https://openairdocs.org/faa-owner/AIRBORNE%20LEASING%20INC), [Sylmar, CA](https://openairdocs.org/faa-place/CA/Sylmar), built 1985, S/N 7279
- [N109PB](https://openairdocs.org/aircraft/N109PB): [Bennedsen Rosa Fadia Gabriel](https://openairdocs.org/faa-owner/BENNEDSEN%20ROSA%20FADIA%20GABRIEL), [Aventura, FL](https://openairdocs.org/faa-place/FL/Aventura), built 1985, S/N 7344
- [N109US](https://openairdocs.org/aircraft/N109US): [U S Helicopters Inc](https://openairdocs.org/faa-owner/U%20S%20HELICOPTERS%20INC), [Marshville, NC](https://openairdocs.org/faa-place/NC/Marshville), built 1977, S/N 2164
- [N109XP](https://openairdocs.org/aircraft/N109XP): [National Test Pilot School](https://openairdocs.org/faa-owner/NATIONAL%20TEST%20PILOT%20SCHOOL), [Mojave, CA](https://openairdocs.org/faa-place/CA/Mojave), built 1981, S/N 7178
- [N10AJ](https://openairdocs.org/aircraft/N10AJ): [El Aero Services LLC](https://openairdocs.org/faa-owner/EL%20AERO%20SERVICES%20LLC), [Elko, NV](https://openairdocs.org/faa-place/NV/Elko), built 1980, S/N 3169
- [N10KX](https://openairdocs.org/aircraft/N10KX): [Whirly Leasing Inc](https://openairdocs.org/faa-owner/WHIRLY%20LEASING%20INC), [Richvale, CA](https://openairdocs.org/faa-place/CA/Richvale), built 1975, S/N 1628
- [N10MY](https://openairdocs.org/aircraft/N10MY): [Boston Executive Helicopters LLC](https://openairdocs.org/faa-owner/BOSTON%20EXECUTIVE%20HELICOPTERS%20LLC), [Norwood, MA](https://openairdocs.org/faa-place/MA/Norwood), built 1991, S/N 5500
- [N1103L](https://openairdocs.org/aircraft/N1103L): [Aviation Advantage Inc](https://openairdocs.org/faa-owner/AVIATION%20ADVANTAGE%20INC), [Tabor City, NC](https://openairdocs.org/faa-place/NC/Tabor%20City), built 1980, S/N 1000812D
- [N11056](https://openairdocs.org/aircraft/N11056): [Northwest Helicopters I Inc](https://openairdocs.org/faa-owner/NORTHWEST%20HELICOPTERS%20I%20INC), [Olympia, WA](https://openairdocs.org/faa-place/WA/Olympia), built 1981, S/N 310905D
- [N112LP](https://openairdocs.org/aircraft/N112LP): [Ranger Aviation Leasing LLC](https://openairdocs.org/faa-owner/RANGER%20AVIATION%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), S/N 3403
- [N113RL](https://openairdocs.org/aircraft/N113RL): [Marks Aviation Group LLC](https://openairdocs.org/faa-owner/MARKS%20AVIATION%20GROUP%20LLC), [Lafayette, LA](https://openairdocs.org/faa-place/LA/Lafayette), built 1981, S/N 3306
- [N114HD](https://openairdocs.org/aircraft/N114HD): [Windward Aviation Inc](https://openairdocs.org/faa-owner/WINDWARD%20AVIATION%20INC), [Puunene, HI](https://openairdocs.org/faa-place/HI/Puunene), built 1978, S/N 280261D
- [N1158B](https://openairdocs.org/aircraft/N1158B): [Air Gov 1 LLC](https://openairdocs.org/faa-owner/AIR%20GOV%201%20LLC), [Rome, NY](https://openairdocs.org/faa-place/NY/Rome), built 1996, S/N 4431
- [N115SU](https://openairdocs.org/aircraft/N115SU): [Signature Property Holdings LLC](https://openairdocs.org/faa-owner/SIGNATURE%20PROPERTY%20HOLDINGS%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2021, S/N 110868D
- [N117HK](https://openairdocs.org/aircraft/N117HK): [Settan Corp](https://openairdocs.org/faa-owner/SETTAN%20CORP), [Goleta, CA](https://openairdocs.org/faa-place/CA/Goleta), built 1997, S/N 4462
- [N118FW](https://openairdocs.org/aircraft/N118FW): [Florida Fish & Wildlife Conservation Commission](https://openairdocs.org/faa-owner/FLORIDA%20FISH%20%26%20WILDLIFE%20CONSERVATION%20COMMISSION), [Lakeland, FL](https://openairdocs.org/faa-place/FL/Lakeland), built 1991, S/N 4182
- [N118TV](https://openairdocs.org/aircraft/N118TV): [Interstate Helicopter Inc](https://openairdocs.org/faa-owner/INTERSTATE%20HELICOPTER%20INC), [Bethany, OK](https://openairdocs.org/faa-place/OK/Bethany), built 1979, S/N 2844
- [N11FH](https://openairdocs.org/aircraft/N11FH): [D H Helicopter Inc DBA](https://openairdocs.org/faa-owner/D%20H%20HELICOPTER%20INC%20DBA), [Sauget, IL](https://openairdocs.org/faa-place/IL/Sauget), built 1993, S/N 4270
- [N11ZX](https://openairdocs.org/aircraft/N11ZX): [Big Bird Leasing Inc](https://openairdocs.org/faa-owner/BIG%20BIRD%20LEASING%20INC), [Saint Peter, MN](https://openairdocs.org/faa-place/MN/Saint%20Peter), built 1974, S/N 640609S
- [N1219W](https://openairdocs.org/aircraft/N1219W): [Moes Crop Dusting Service Inc](https://openairdocs.org/faa-owner/MOES%20CROP%20DUSTING%20SERVICE%20INC), [Marysville, CA](https://openairdocs.org/faa-place/CA/Marysville), built 1975, S/N 1843
- [N124EH](https://openairdocs.org/aircraft/N124EH): [Jbp Aviation LLC](https://openairdocs.org/faa-owner/JBP%20AVIATION%20LLC), [Henderson, NV](https://openairdocs.org/faa-place/NV/Henderson), S/N S559
- [N124PD](https://openairdocs.org/aircraft/N124PD): [H & O Helicopters Inc Trustee](https://openairdocs.org/faa-owner/H%20%26%20O%20HELICOPTERS%20INC%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1992, S/N 0502E
- [N126KW](https://openairdocs.org/aircraft/N126KW): [Hlh Leasing LLC](https://openairdocs.org/faa-owner/HLH%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1991, S/N 0489E
- [N12AA](https://openairdocs.org/aircraft/N12AA): [Allsouth Aviation LLC](https://openairdocs.org/faa-owner/ALLSOUTH%20AVIATION%20LLC), [Buford, GA](https://openairdocs.org/faa-place/GA/Buford), built 1996, S/N 52165
- [N12TH](https://openairdocs.org/aircraft/N12TH): [Harding Tim](https://openairdocs.org/faa-owner/HARDING%20TIM), [Bryan, TX](https://openairdocs.org/faa-place/TX/Bryan), S/N 0224E
- [N130BH](https://openairdocs.org/aircraft/N130BH): [Obrien Helicopters Inc](https://openairdocs.org/faa-owner/OBRIEN%20HELICOPTERS%20INC), [Lehigh Acres, FL](https://openairdocs.org/faa-place/FL/Lehigh%20Acres), built 1975, S/N 1776
- [N130JH](https://openairdocs.org/aircraft/N130JH): [Ranger Aviation Leasing LLC](https://openairdocs.org/faa-owner/RANGER%20AVIATION%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), S/N 4166
- [N131AE](https://openairdocs.org/aircraft/N131AE): [Atwood Aviation LLC](https://openairdocs.org/faa-owner/ATWOOD%20AVIATION%20LLC), [Pickerington, OH](https://openairdocs.org/faa-place/OH/Pickerington), built 1988, S/N S787
- [N13KJ](https://openairdocs.org/aircraft/N13KJ): [Carlston Carl Vaughn](https://openairdocs.org/faa-owner/CARLSTON%20CARL%20VAUGHN), [Murray, UT](https://openairdocs.org/faa-place/UT/Murray), built 1991, S/N 0444E
- [N150F](https://openairdocs.org/aircraft/N150F): [11 11 Enterprises LLC](https://openairdocs.org/faa-owner/11%2011%20ENTERPRISES%20LLC), [San German, PR](https://openairdocs.org/faa-place/PR/San%20German), built 1975, S/N 1866
- [N152CA](https://openairdocs.org/aircraft/N152CA): [Chem Air LLC](https://openairdocs.org/faa-owner/CHEM%20AIR%20LLC), [Shreveport, LA](https://openairdocs.org/faa-place/LA/Shreveport), built 1978, S/N 2342
- [N15TH](https://openairdocs.org/aircraft/N15TH): [Heliservice LLC](https://openairdocs.org/faa-owner/HELISERVICE%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2003, S/N 0564E
- [N16002](https://openairdocs.org/aircraft/N16002): [Commonweath Of Massachusetts](https://openairdocs.org/faa-owner/COMMONWEATH%20OF%20MASSACHUSETTS), [East Boston, MA](https://openairdocs.org/faa-place/MA/East%20Boston), S/N 0194E
- [N1602L](https://openairdocs.org/aircraft/N1602L): [Saxton Helicopter Leasing LLC](https://openairdocs.org/faa-owner/SAXTON%20HELICOPTER%20LEASING%20LLC), [Plymouth, MI](https://openairdocs.org/faa-place/MI/Plymouth), S/N 0225E
- [N1604Z](https://openairdocs.org/aircraft/N1604Z): [Dept Of Fish Wildlife And Parks](https://openairdocs.org/faa-owner/DEPT%20OF%20FISH%20WILDLIFE%20AND%20PARKS), [Helena, MT](https://openairdocs.org/faa-place/MT/Helena), built 1989, S/N 0341E
- [N16050](https://openairdocs.org/aircraft/N16050): [Venturi Aviation LLC](https://openairdocs.org/faa-owner/VENTURI%20AVIATION%20LLC), [Missoula, MT](https://openairdocs.org/faa-place/MT/Missoula), S/N 0276E

All 530: https://openairdocs.org/engine/allison-250-c20-series/aircraft.md

## NTSB investigations (372, 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 WPR26LA347](https://openairdocs.org/ntsb/WPR26LA347), Sep 18, 2026: Bell 206B-III (N50141), Creswell, NC, substantial damage, investigation ongoing
- [NTSB WPR26LA199](https://openairdocs.org/ntsb/WPR26LA199), May 23, 2026: Bell 206-L4 (N917SU), Cedar City, UT, substantial damage. Probable cause: The flight instructor's failure to maintain helicopter control while manipulating the engine governor reference rpm adjustment during hover operations, which resulted in a loss of control and impact…
- [NTSB CEN24LA377](https://openairdocs.org/ntsb/CEN24LA377), Sep 30, 2024: Mcdonnell Douglas Helicopter 369E (N8372F), Manvel, TX, substantial damage. Probable cause: The pilot’s improper recovery from a practice autorotation which resulted in a hard landing. Contributing to the accident was the instructor’s inadequate supervision of the pilot receiving…
- [NTSB WPR24LA319](https://openairdocs.org/ntsb/WPR24LA319), Sep 26, 2024: Bell 206L (N9984K), Fern Prairie, WA, substantial damage. Probable cause: An aeroelastic interaction between the helicopter’s main rotor blades and nodal beam system, which resulted in oscillations that exceeded the design limits of the tailboom. Contributing to the…
- [NTSB ANC24FA089](https://openairdocs.org/ntsb/ANC24FA089), Sep 7, 2024: Bell 206B (N306FW), King Salmon, AK, substantial damage, 1 fatal. Probable cause: The pilot’s decision to initiate the visual flight into instrument meteorological conditions, which resulted in his spatial disorientation, failure to maintain helicopter control and subsequent…
- [NTSB ERA24LA215](https://openairdocs.org/ntsb/ERA24LA215), May 10, 2024: Hughes 369 (N969VS), Crestview, FL, substantial damage. Probable cause: The pilot’s improper flare, which resulted in a hard landing and the main rotor blades contacting the tail boom.
- [NTSB ANC24LA012](https://openairdocs.org/ntsb/ANC24LA012), Jan 25, 2024: Mcdonnell Douglas Helicopter 369E (N545PH), Waialua, HI, substantial damage. Probable cause: The pilot's inability to maintain directional control after a skid got caught on a fence while he was maneuvering the helicopter for takeoff, which resulted in a dynamic roll-over.
- [NTSB CEN23LA404](https://openairdocs.org/ntsb/CEN23LA404), Sep 7, 2023: Mcdonnell Douglas Helicopter 369E (N8372F), Arcola, TX, substantial damage. Probable cause: The instructor’s failure to re-apply engine power during a power recovery after a practice autorotation which resulted in a hard landing.
- [NTSB WPR23LA278](https://openairdocs.org/ntsb/WPR23LA278), Jul 19, 2023: Aerospatiale AS-355E Twin Star (N102UM), Farmington, UT, substantial damage. Probable cause: The premature failure of one of the No. 2 engine compressor bleed valve, which resulted in a partial loss of power to that engine.
- [NTSB CEN23LA279](https://openairdocs.org/ntsb/CEN23LA279), Jul 5, 2023: Bell 206B (N67FA), Chapman, KS, substantial damage. Probable cause: The pilot’s failure to maintain clearance from the power line during an agricultural application pass.
- [NTSB WPR23LA004](https://openairdocs.org/ntsb/WPR23LA004), Oct 1, 2022: Bell 206B (N284CA), Fresno, CA, substantial damage. Probable cause: The disbond of a tail rotor drive shaft splined adapter, which resulted in a loss of tail rotor drive and a subsequent hard landing.
- [NTSB CEN22LA305](https://openairdocs.org/ntsb/CEN22LA305), Jul 1, 2022: Bell 206B (N882NY), East Troy, WI, substantial damage. Probable cause: The pilot’s improper fuel management that resulted in fuel exhaustion and a loss of engine power.
- [NTSB WPR22LA236](https://openairdocs.org/ntsb/WPR22LA236), Jun 24, 2022: Bell 206B (N915B), Merced, CA, substantial damage. Probable cause: The in-flight failure of the engine-to-transmission drive shaft due to a fatigue fracture of one of the KAflex flex frames caused by a loose bolt, which resulted in a total loss of power to the…
- [NTSB ERA22LA206](https://openairdocs.org/ntsb/ERA22LA206), Apr 26, 2022: Bell 206 (N206BX), Lake Apopka, FL, substantial damage. Probable cause: A collision with water following a loss of visual reference to the water surface due to sun glare.
- [NTSB CEN22LA146](https://openairdocs.org/ntsb/CEN22LA146), Mar 17, 2022: Hughes 369 (N500MZ), Adair, IA, substantial damage. Probable cause: The mechanic’s failure to properly torque a fuel control unit B-nut, which resulted in a partial loss of engine power, an attempted autorotation, and an impact with terrain.
- [NTSB WPR22FA101](https://openairdocs.org/ntsb/WPR22FA101), Feb 20, 2022: Mcdonnell Douglas 500N (N521HB), Newport Beach, CA, substantial damage, 1 fatal. Probable cause: The helicopter’s encounter with unanticipated right yaw during a low-altitude, low-airspeed, tight-radius orbit. Contributing to the accident was the pilot’s distraction during the orbit, which…
- [NTSB ERA22LA117](https://openairdocs.org/ntsb/ERA22LA117), Feb 9, 2022: Hughes 369D (N9159F), Bel Air, MD, substantial damage. Probable cause: A loss of engine power due to bearing failures in the turbine section resulting from a fatigue fracture of the oil supply line that fed oil to the Nos. 6 and 7 bearings. The oil line failure led to…
- [NTSB CEN22FA086](https://openairdocs.org/ntsb/CEN22FA086), Dec 30, 2021: Bell 206B (N8AU), Livingston, TX, substantial damage, 2 fatal. Probable cause: The pilot exceeding the yaw control capability of the helicopter for the flight conditions, resulting in a non-mechanical loss of tail rotor effectiveness.
- [NTSB CEN21LA356](https://openairdocs.org/ntsb/CEN21LA356), Aug 4, 2021: Bell 206 (N59552), Corydon, IN, substantial damage. Probable cause: The pilot’s failure to see and avoid power lines.
- [NTSB ERA21LA269](https://openairdocs.org/ntsb/ERA21LA269), Jun 25, 2021: Garlick Helicopters OH-58A+ (N372NS), Alpine, AL, substantial damage, 1 fatal. Probable cause: The pilot’s failure to maintain clearance from powerlines during a low-level aerial application flight, resulting in main rotor blade impact with a fiber-optic cable, a loss of control, and the…
- [NTSB ERA21LA262](https://openairdocs.org/ntsb/ERA21LA262), Jun 18, 2021: Mcdonnell Douglas Helicopter 369E (N371EE), Swan Lake, NY, substantial damage. Probable cause: The pilot's failure to maintain adequate clearance from the power transmission tower structure during powerline maintenance work, which resulted in the helicopter's main rotor striking the lifeline…
- [NTSB ERA21FA130](https://openairdocs.org/ntsb/ERA21FA130), Feb 15, 2021: Bell 206 (N13AT), St Thomas, CB, destroyed, 4 fatal. Probable cause: A total loss of engine power due to fatigue failure of two of the stage 3 compressor blades. Contributing to the failure of the compressor blades was the failure of maintenance personnel to inspect…
- [NTSB ERA21LA126](https://openairdocs.org/ntsb/ERA21LA126), Feb 4, 2021: Bell 206 (N820H), Pahokee, FL, substantial damage. Probable cause: A loss of main rotor rpm for reasons that could not be determined, which resulted in an autorotation and a subsequent hard landing and rollover.
- [NTSB ERA21LA028](https://openairdocs.org/ntsb/ERA21LA028), Oct 21, 2020: Bell 206 (N716VL), Point Lookout, NY, substantial damage. Probable cause: The pilot’s decision to depart on a visual flight rules flight, and to continue that flight into forecasted and deteriorating instrument meteorological conditions (IMC) in a helicopter that was not…
- [NTSB CEN20LA273](https://openairdocs.org/ntsb/CEN20LA273), Jul 11, 2020: Aerospatiale AS355 (N708AC), Rifle, CO, destroyed. Probable cause: A loss of tail rotor effectiveness, the pilot’s subsequent loss of helicopter control, and collision with terrain.
- [NTSB WPR20CA162](https://openairdocs.org/ntsb/WPR20CA162), May 30, 2020: Bell 206 (N401HP), Elko, NV, substantial damage. Probable cause: The pilot's failure to maintain helicopter control in gusting wind that resulted in a loss in altitude and subsequent collision with a fence.
- [NTSB ERA20LA160](https://openairdocs.org/ntsb/ERA20LA160), Apr 25, 2020: Hughes 369 (N9159F), Pylesville, MD, substantial damage. Probable cause: The loss of engine power due to fuel starvation as a result of unporting of the fuel tank supply pickup while the helicopter was maneuvered to move a conductor wire. Contributing to the accident was…
- [NTSB CEN20LA073](https://openairdocs.org/ntsb/CEN20LA073), Feb 1, 2020: Hiller UH 12E (N7173S), Dinosaur, CO, substantial damage. Probable cause: Failure of a S4 compressor blade due to a fatigue crack that likely initiated at a corrosion pit. Contributing to the accident was maintenance personnel’s failure to detect the corrosion pits during…
- [NTSB WPR19LA135](https://openairdocs.org/ntsb/WPR19LA135), May 4, 2019: Bell 206 (N49643), Oxnard, CA, substantial damage. Probable cause: The pilot’s inability to maintain control of the helicopter while maneuvering at a low altitude due to reasons that could not be determined based on available evidence.
- [NTSB WPR19LA087](https://openairdocs.org/ntsb/WPR19LA087), Feb 21, 2019: MD Helicopter 369 (N506PH), Kukuihaele, HI, substantial damage. Probable cause: The partial loss of engine power due to corrosion in the engine bleed valve due to wash solution intrusion. Contributing to the accident was the installation of a bushing manufactured to incorrect…
- [NTSB CEN19FA020](https://openairdocs.org/ntsb/CEN19FA020), Nov 2, 2018: Hughes 369 (N5187S), McDougal, AR, destroyed, 1 fatal. Probable cause: The pilot's failure to maintain the helicopter's clearance from the powerline structure while hovering in gusty wind conditions, which resulted in an inadvertent collision with the structure and an…
- [NTSB ERA19FA035](https://openairdocs.org/ntsb/ERA19FA035), Oct 30, 2018: Aerospatiale AS 355F2 (N372CA), Beekmantown, NY, destroyed, 2 fatal. Probable cause: The pilot's failure to keep the helicopter clear of a utility pole while hovering with a tailwind, which resulted in a dynamic rollover into active power lines.
- [NTSB CEN18LA365](https://openairdocs.org/ntsb/CEN18LA365), Sep 3, 2018: MD Helicopters MD-369 (N1601Y), Orchard Lake, MI, substantial damage. Probable cause: The pilot's failure to maintain helicopter control and terrain clearance while in a hover after performing an evasive maneuver to avoid wildlife.
- [NTSB GAA18CA512](https://openairdocs.org/ntsb/GAA18CA512), Aug 18, 2018: Bell 206 (N8052G), Battle Mountain, NV, destroyed. Probable cause: The pilot's failure to maintain the proper altitude and airspeed while flying in a canyon in gusting wind conditions.
- [NTSB WPR18LA226](https://openairdocs.org/ntsb/WPR18LA226), Aug 17, 2018: Hughes 369 (N105JL), Riverside, CA, substantial damage. Probable cause: The instructor’s delayed remedial action to an excessive descent rate during a simulated autorotation, which resulted in a hard landing.
- [NTSB ERA18LA183](https://openairdocs.org/ntsb/ERA18LA183), Jun 30, 2018: Bell 206 (N10CV), Rio Grande, PR, substantial damage, 1 fatal. Probable cause: A total loss of engine power due to oil exhaustion, which resulted in an uncontrolled descent and hard landing.
- [NTSB WPR18LA164](https://openairdocs.org/ntsb/WPR18LA164), Jun 5, 2018: Bell 206 (N518Z), Sanders, KY, substantial damage. Probable cause: A partial loss of engine power for undetermined reasons, and a loss of main rotor rpm during the subsequent autorotation, which resulted in a hard landing.
- [NTSB GAA18CA117](https://openairdocs.org/ntsb/GAA18CA117), Feb 1, 2018: Hughes Helicopters 369 (N618SG), Wrightwood, CA, substantial damage. Probable cause: The pilot’s high altitude, high gross weight landing with insufficient tail rotor thrust resulting in a loss of tail rotor effectiveness.
- [NTSB WPR18FA074](https://openairdocs.org/ntsb/WPR18FA074), Jan 27, 2018: Hughes 369D (N369TH), Pomeroy, WA, substantial damage, 1 fatal. Probable cause: A loss of control following the gunner's failure to ensure that the net maintained clearance from the tail rotor.
- [NTSB ERA18LA091](https://openairdocs.org/ntsb/ERA18LA091), Jan 11, 2018: Hughes 369 (N571HH), San Juan, PR, no damage. Probable cause: The helicopter pilot's improper decision to use an open-end grapple, instead of an A-frame attachment, to lift and move a ladder with a lineman on it and the lineman's improper decision to be lifted…
- [NTSB WPR18LA029](https://openairdocs.org/ntsb/WPR18LA029), Nov 7, 2017: Bell 206 (N93PH), Rolling Fork, MS, substantial damage. Probable cause: An uncommanded yaw and subsequent loss of main rotor rpm for reasons that could not be determined.
- [NTSB CEN17LA314](https://openairdocs.org/ntsb/CEN17LA314), Aug 10, 2017: Hughes 369D (N58424), Villa Grove, CO, substantial damage. Probable cause: The pilot’s failure to maintain main rotor clearance from a power line tower during low-level maneuvering.
- [NTSB GAA17CA402](https://openairdocs.org/ntsb/GAA17CA402), Jun 30, 2017: Bell 206 (N60KH), Uniontown, KY, substantial damage. Probable cause: The pilot's failure to maintain adequate separation from power lines, which resulted in a loss of helicopter control.
- [NTSB GAA17CA369](https://openairdocs.org/ntsb/GAA17CA369), Jun 26, 2017: Bell 206B (N183TC), Entiat, WA, substantial damage. Probable cause: The pilot’s failure to secure a loose item inside the cockpit that interfered with antitorque pedal control and led to a loss of helicopter control due to a loss of tail rotor effectiveness.
- [NTSB ERA17LA209](https://openairdocs.org/ntsb/ERA17LA209), Jun 23, 2017: Hughes 369 (N765KV), Dennis, WV, substantial damage. Probable cause: The unporting of fuel due to the helicopter's nose-up attitude during long line operations, which resulted in fuel starvation and a total loss of engine power.
- [NTSB ERA17TA170](https://openairdocs.org/ntsb/ERA17TA170), May 2, 2017: Bell 206 (N911GE), Orange Springs, FL, substantial damage. Probable cause: The pilot's failure to maintain adequate clearance between the helicopter's skid and the firefighting bucket and suspension cable, which resulted in the cable becoming entangled on the landing skid…
- [NTSB GAA17CA218](https://openairdocs.org/ntsb/GAA17CA218), Apr 6, 2017: Bell 206 (N206SA), La Verne, CA, substantial damage. Probable cause: The pilot’s early increased application of the collective during a simulated hovering autorotation, which resulted in a loss of rotor rpm and subsequent main rotor blade strike of the tailboom.
- [NTSB WPR17LA075](https://openairdocs.org/ntsb/WPR17LA075), Feb 22, 2017: Hughes 369A (N805LA), (Pacific Ocean), substantial damage. Probable cause: The pilot's failure to detect the presence of water in the helicopter fuel system before the flight, which resulted in a total loss of engine power during cruise. Contributing to the accident was the…
- [NTSB CEN17FA100](https://openairdocs.org/ntsb/CEN17FA100), Feb 7, 2017: Bell 206B (N978RH), Galveston, TX, destroyed, 1 fatal. Probable cause: The pilot's failure to recognize the flight had encountered instrument meteorological conditions at night, which resulted in an unrecognized descent and collision with water.
- [NTSB WPR16LA188](https://openairdocs.org/ntsb/WPR16LA188), Sep 12, 2016: Bell 206B (N6181A), Rockport, WA, substantial damage. Probable cause: The pilot's failure to maintain helicopter control while on the ground, which resulted in mast bumping.

All 372: https://openairdocs.org/engine/allison-250-c20-series/ntsb.md

## FAA accident and incident reports (468, 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.

- [Accident 20260523009559A](https://openairdocs.org/incident/20260523009559A), May 23, 2026: Bell 206-L4 (N917SU), Cedar City, UT, Destroyed. A helicopter pilot instructor (who was sitting in the right seat) and student flying a Bell 206L-4, with registration number [privacy data omitted], were…
- [Incident 20250928012199I](https://openairdocs.org/incident/20250928012199I), Sep 28, 2025: Bell Helicopter Textron 206L-1 (N178PA), Tusayan, AZ, Minor damage. On September 28, 2025, a Bell 206 aircraft, departed on an air tour flight where the left engine couling separated from the aircraft. No other damage occurred.…
- [Accident 20240930015339A](https://openairdocs.org/incident/20240930015339A), Sep 30, 2024: Mcdonnell Douglas Helicopter 369E (N8372F), Manvel, TX, Substantial damage. During an evaluation/check-ride flight on 30 September 2024. The pilot under evaluation who was the PIC was at the controls performing a practice autorotation…
- [Accident 20240926014629A](https://openairdocs.org/incident/20240926014629A), Sep 26, 2024: Bell 206L (N9984K), Fern Prairie, WA, Substantial damage. On September 26th the pilot was flying, from toutle, WA to boring Oregon single pilot, no cargo and 150 lbs of fuel. Around 4:00 pm the pilot experienced…
- [Accident 20240907012279A](https://openairdocs.org/incident/20240907012279A), Sep 7, 2024: Bell 206B (N306FW), King Salmon, AK, Substantial damage, 1 fatal. On September 7, 2024, about 0924 Alaska daylight time, a Bell 206B helicopter, [privacy data omitted], sustained substantial damage when it was involved in an…
- [Accident 20240510005569A](https://openairdocs.org/incident/20240510005569A), May 10, 2024: Hughes 369D (N969VS), Crestview, FL, Substantial damage. While performing full autorotation to landing the tail skid struck the ground, and while leveling the aircraft and reducing the collective the main rotor…
- [Accident 20240125000379A](https://openairdocs.org/incident/20240125000379A), Jan 25, 2024: Mcdonnell Douglas Helicopter 369E (N545PH), Wahiawa, HI, Substantial damage. The pilot was taking off from a confined remote mountainside landing zone. During vertical takeoff, the helicopter drifted forward and the right skid hooked a…
- [Accident 20230907010599A](https://openairdocs.org/incident/20230907010599A), Sep 7, 2023: Mcdonnell Douglas Helicopter 369E (N8372F), Houston, TX, Substantial damage. PIC was giving an evaluation flight at kaxh. After several takeoffs and landings to rwy 27 the PIC initiated power recovery autorotations to rwy 27. The crew…
- [Incident 20230801006589I](https://openairdocs.org/incident/20230801006589I), Aug 1, 2023: Mcdonnell Douglas Helicopter 369E (N808BH), Paxson, AK, Minor damage. Pilot attempted sloped landing on downwind side of a ridge line at the top of a mountain slope with winds at 12-15 KTS gusting 23-25 KTS from wnw with 10 miles…
- [Accident 20230719008919A](https://openairdocs.org/incident/20230719008919A), Jul 19, 2023: Aerospatiale AS-355E TWIN STAR (N102UM), Farmington, UT, Substantial damage. The flight was to drop off a vegetation removal crew, who were contracted by rocky mountain power to remove vegetation surrounding power lines. Three did not…
- [Accident 20230705011249A](https://openairdocs.org/incident/20230705011249A), Jul 5, 2023: Bell 206B (N67FA), Chapman, KS, Substantial damage. On 07/05/2023 with VFR weather, at 16:48 CST, the Kansas highway patrol reported aircraft [privacy data omitted], a Bell 206 helicopter, had crashed while…
- [Incident 20230201000159I](https://openairdocs.org/incident/20230201000159I), Feb 1, 2023: Mcdonnell Douglas Helicopter 369E (N545PH), Honolulu, HI, Minor damage. On 2/1/2023, while conducting aerial survey for invasive plant species with one passenger on board, the PIC encountered a wire strike resulting in damage to 3…
- [Incident 20221126019119I](https://openairdocs.org/incident/20221126019119I), Nov 26, 2022: Mcdonnell Douglas Helicopter 500N (N302HF), Honolulu, HI, Minor damage. Public use aircraft performing coastline water patrol at approximately 100 feet when a wave rebounded off the cliff face into subject helicopter. Left side…
- [Accident 20221001020829A](https://openairdocs.org/incident/20221001020829A), Oct 1, 2022: Bell 206B (N284CA), Fresno, CA, Substantial damage. On Saturday, October 1, 2022, at approximately 1100 pacific daylight time (PDT), a Bell 206B jetranger who was on a “return to service” maintenance flight, was…
- [Accident 20220701005109A](https://openairdocs.org/incident/20220701005109A), Jul 1, 2022: Bell 206B (N882NY), East Troy, WI, Substantial damage. The accident occurred on July 01, 2022, at East Troy Airport (57C). N882NY, a Bell B206 helicopter, lost power during an attempted landing on a fuel bowser…
- [Accident 20220624008519A](https://openairdocs.org/incident/20220624008519A), Jun 24, 2022: Bell 206B (N915B), Merced, CA, Substantial damage. On June 24, 2022, at approximately 0927 PDT, N915B, a Bell 206B, helicopter experienced a hard landing while dispensing pesticides. The aircraft was in process…
- [Accident 20220426002649A](https://openairdocs.org/incident/20220426002649A), Apr 26, 2022: Bell 206B (N206BX), Winter Garden, FL, Substantial damage. On 04/26/2022 at 0720 an aircraft performing aerial spraying of herbicide at lake apopka, Florida, contacted the lake nose down, causing the aircraft to flip…
- [Accident 20220317001229A](https://openairdocs.org/incident/20220317001229A), Mar 17, 2022: Hughes 500D (N500MZ), Adair, IA, Destroyed. During flight operations helicopter engine entered a low power setting. Pilot was unable to maintain altitude and subsequently crashed.
- [Accident 20220219001009A](https://openairdocs.org/incident/20220219001009A), Feb 19, 2022: Mcdonnell Douglas Helicopter 500N (N521HB), Newport Beach, CA, Substantial damage, 1 fatal. On 02/19/2022, approximately 18:30 pacific standard time, huntington Beach police helicopter, MD500N, N521HB, operating as a public aircraft, responded to a…
- [Accident 20220209000919A](https://openairdocs.org/incident/20220209000919A), Feb 9, 2022: Hughes 369D (N9159F), Bel Air, MD, Substantial damage. Weather was clear and calm. Aircraft engine suffered mechanical failure, causing loss of power. Pilot autorotated aircraft to vacant field. Main rotor blades…
- [Accident 20211230021549A](https://openairdocs.org/incident/20211230021549A), Dec 30, 2021: Bell 206B (N8AU), Livingston, TX, Substantial damage, 1 fatal. On 12/30/2021 N8AU might have crashed due to loss of tail rotor effectiveness (lte) in a pasture near Livingston Texas. Four people on board, one fatal, one…
- [Incident 20210816014389I](https://openairdocs.org/incident/20210816014389I), Aug 16, 2021: Bell 206B (N874M), St. Augustine, FL, Minor damage. Pilot was taking off near golf course for mosquito control, during takeoff at approx. 30' the main rotor blades made contact with a bending tree top from windy…
- [Accident 20210804008749A](https://openairdocs.org/incident/20210804008749A), Aug 4, 2021: Bell 206B (N59552), Corydon, IN, Substantial damage. On August 4, 2021, at approximately 1435 eastern daylight time, a Bell 206B aircraft, N59552, landed in a corn field approximately 4.6 miles northeast of…
- [Accident 20210625006969A](https://openairdocs.org/incident/20210625006969A), Jun 25, 2021: Garlick Helicopters Inc OH-58A+ (N372NS), Alpine, AL, Substantial damage, 1 fatal. N372NS was conducting low level agricultural spraying when it struck power lines. After striking the power lines, the aircraft descended striking the ground,…
- [Accident 20210618015959A](https://openairdocs.org/incident/20210618015959A), Jun 18, 2021: Mcdonnell Douglas Helicopter 369E (N371EE), Ferndale, NY, Substantial damage. On 06/18/2021 at approximately 8:15 am EST, a Mcdonnell Douglas Helicopter, model 369E, registration number N371EE, s/n 0371E, certificated in the standard…
- [Accident 20210215001469A](https://openairdocs.org/incident/20210215001469A), Feb 15, 2021: Bell 206B (N13AT), Charlotte Amali, VI, Destroyed, 4 fatal. On February 15, 2021, at or about 1514 atlantic standard time, N13AT was destroyed when it was involved in an accident near botany bay st. thomas, U.S. Virgin…
- [Accident 20210204000139A](https://openairdocs.org/incident/20210204000139A), Feb 4, 2021: Bell Helicopter Textron Canada 206B (N820H), South Bay, FL, Destroyed. On February 4,2021 at aprox 0015L, N820H helicopter crashed while being used for rotor downwash of warm [privacy data omitted]onto corn crops, in order to…
- [Incident 20201102019099I](https://openairdocs.org/incident/20201102019099I), Nov 2, 2020: Agusta Spa A109C (N162SH), Concord, CA, No damage. In cruise flight at 1000 feet AGL pilot noticed number one engine with a rapidly rising tot beyond permissible operating limits along with a decrease of engine…
- [Accident 20201021015709A](https://openairdocs.org/incident/20201021015709A), Oct 21, 2020: Bell 206B (N716VL), Point Outlook, NY, Substantial damage. N716VL departed kfrg on svfr and was reported as in the clouds and in distress through jfk tower. While jfk worked issue communication with aircraft was lost.…
- [Accident 20200711011209A](https://openairdocs.org/incident/20200711011209A), Jul 11, 2020: Aerospatiale AS 355F1 (N708AC), Rifle, CO, Destroyed. According to the crewmember, the aircraft was in a hover for a few seconds while trying to decide which power line to observe. The aircraft started to sway…
- [Accident 20200530010849A](https://openairdocs.org/incident/20200530010849A), May 30, 2020: Bell 206B (N401HP), Elko, NV, Substantial damage. Aircraft landed for fuel on a CFR part 91 re position flight from kmlf to keko and to continue to Oregon to be delivered to new owner. Aircraft originated from…
- [Accident 20200425006529A](https://openairdocs.org/incident/20200425006529A), Apr 25, 2020: Hughes 369D (N9159F), Pylesville, MD, Substantial damage. At approximately 12:40PM on 4/25/20 the aircraft was involved in repositioning a high tension power line via long line external load at approximately 150 ft…
- [Accident 20200201002999A](https://openairdocs.org/incident/20200201002999A), Feb 1, 2020: Hiller UH-12E (N7173S), Dinosaur, CO, Substantial damage. Pilot and two passengers departed from the pilot?s home heading to one of the passenger?s ranch. Enroute and at about 700 ft AGL, the pilot heard a loud…
- [Accident 20190504003939A](https://openairdocs.org/incident/20190504003939A), May 4, 2019: Bell 206B (N49643), Oxnard, CA, Destroyed. On may 4, 2019 N49643 s/n 1813, Bell helicopter 206B was equipted with agricultural equiptment (isolair model 3900 agricultural spray system). The tanks were…
- [Accident 20190221011099A](https://openairdocs.org/incident/20190221011099A), Feb 21, 2019: Mcdonnell Douglas Helicopter 369E (N506PH), Kukuihaele, HI, Substantial damage. At approximately 06:45, the pilot just prior to his descent into his intended point of landing he noticed an engine temperature of 909C, 100% rotor and 0%…
- [Accident 20181102021389A](https://openairdocs.org/incident/20181102021389A), Nov 2, 2018: Hughes 369D (N5187S), Mcdougal, AR, Destroyed, 1 fatal. On November 2, 2018 a MD369 helicopter N5187S/N454AR, S/N610968D operated by air 2 LLC certificate number X2RL798I crashed in Mcdougal Arkansas. At 1253, the…
- [Accident 20181030021189A](https://openairdocs.org/incident/20181030021189A), Oct 30, 2018: Aerospatiale AS 355F2 (N372CA), Beekmantown, NY, Destroyed, 2 fatal. On 10/30/2018 at approximately 1630 N372CA an Aerospatiale AS355F2 operator while performing powerline inspection/repair operations with four persons on board…
- [Accident 20180818018519A](https://openairdocs.org/incident/20180818018519A), Aug 18, 2018: Bell 206B (N8052G), Battle Mountain, NV, Destroyed. 8-18-2018 The aircraft was involved in an accident while conducting a chucker wildlife survey. The pilot stated while in close proximity to the ground a…
- [Accident 20180817014409A](https://openairdocs.org/incident/20180817014409A), Aug 17, 2018: Hughes 369D (N105JL), Riverside, CA, Substantial damage. N105JL, a Hughes HU-369D helicopter with two pilots onboard (a CFI and rated private pilot helicopter) were conducting autorotation training. While practicing…
- [Accident 20180630008949A](https://openairdocs.org/incident/20180630008949A), Jun 30, 2018: Bell 206B (N10CV), Rio Grande, PR, Substantial damage, 1 fatal. On jun 30, 2018 at 1623 hrs. (UTC), rotorcraft N10CV, a Bell 206B, departed from fernando luis Ribas Dominicci Airport (sig/tjig) in san juan, puerto rico,…
- [Incident 20180420003889I](https://openairdocs.org/incident/20180420003889I), Apr 20, 2018: Bell 206B (N49643), Goleta, CA, Minor damage. While operating under 14 CFR 137, the helicopter spray boom contacted a high tension powerline. The powerline caused minor damage to the spray boom and left…
- [Incident 20180315014599I](https://openairdocs.org/incident/20180315014599I), Mar 15, 2018: Bell Helicopter BH06 (N501JS), Cropwell, AL, Minor damage. Inadvertant wire strike while engaged in law enforcement/sar. (Public use) Further examination revealed that in addition to the broken windsheild and cabin top…
- [Accident 20180201001939A](https://openairdocs.org/incident/20180201001939A), Feb 1, 2018: Hughes Helicopters Inc HU-369-E (N618SG), Wrightwood, CA, Substantial damage. N618SG, a HU369E on a part 135 revenue flight, lost control during its landing approach just prior to touchdown at a 8300 ft MSL mountain landing zone (lz)…
- [Accident 20180127001639A](https://openairdocs.org/incident/20180127001639A), Jan 27, 2018: Hughes 369D (N369TH), Pomeroy, WA, Substantial damage, 1 fatal. On January 27, 2018 a Hughes 369D with the registration number N369TH crashed while performing animal tagging using the net gun method (mule deer) for the…
- [Accident 20180111000739A](https://openairdocs.org/incident/20180111000739A), Jan 11, 2018: Hughes 369D (N571HH), Naguabo, PR, No damage. The pilot in command (PIC) worked for high line helicopters, LLC (operator), and the linemen worked for arc American, inc (arc), an Indiana based power line…
- [Incident 20171205022709I](https://openairdocs.org/incident/20171205022709I), Dec 5, 2017: Bell BHT-407 (N686AM), Watkins, CO, Minor damage. On December 5, 2017 at 1437 hours, a Bell helicopter model 407, N686AM, serial number 53160, sustained minor damages, following a hard landing, while…
- [Accident 20171107016689A](https://openairdocs.org/incident/20171107016689A), Nov 7, 2017: Bell 206B (N93PH), Rolling Fork, MS, Substantial damage. Pilot suddenly felt the aircraft yaw To the right and then go left, pilot nosed the aircraft up and to the right to get out of the river and clear the line of…
- [Accident 20170811024769A](https://openairdocs.org/incident/20170811024769A), Aug 11, 2017: Schweizer 269D (N2086N), Long Beach, CA, Substantial damage. August 11, 2017 maintenance personnel were performing engine run to check out helicopter rotor transmission which was just installed following overhaul. As…
- [Accident 20170810010359A](https://openairdocs.org/incident/20170810010359A), Aug 10, 2017: Hughes 369D (N58424), Villa Grove, CO, Substantial damage. On August 10, 2017 a huges 369D helicopter inadvertently contacted a powerline pole with its tail rotor, causing a loss of control and impacted the ground. The…
- [Accident 20170630024009A](https://openairdocs.org/incident/20170630024009A), Jun 30, 2017: Bell 206B (N60KH), Uniontown, KY, Substantial damage. The pilot was applying chemicals to a corn field parallel to a powerline. Approaching an intersecting powerline, the pilot pulled up to turn when his right…

All 468: https://openairdocs.org/engine/allison-250-c20-series/incidents.md

## Service difficulty reports (945, newest 50)

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

- [SDR 2026FA0000472](https://openairdocs.org/sdr/2026FA0000472), May 28, 2026: LOCK NUT. FAILED. MS20143 NUTS ARE UTILIZED TO SECURE WITHIN THE ENGINE ASSEMBLY THE FOLLOWING ARTICLES COMPRESSOR, TURBINE, FUEL CONTROL, GOVERNOR, FUEL PUMP, TACH GENERATORS, G
- [SDR EVCA07192021](https://openairdocs.org/sdr/EVCA07192021), Jul 19, 2021: CONTROL UNIT. MALFUNCTIONED. RECENTLY INSTALLED SYSTEM TRUE BLUE BATTERY WAS GETTING A RED TEMP HOT CAUTION LIGHT FOR THE AIRCRAFT BATTERY WHEN THE STARTER BUTTON WAS PRESSED. THE BATTERY W
- [SDR QMLA2020052820022](https://openairdocs.org/sdr/QMLA2020052820022), May 26, 2020: DUCT. LOOSE. DURING CRUISE FLIGHT, CREW AND PATIENT COMPLAINED OF CARBON MONOXIDE POISONING SYMPTOMS INCLUDING LIGHT HEADEDNESS, SLEEPINESS AND HEADACHE. HEATER WAS IN OFF P
- [SDR QMLA2019112299087](https://openairdocs.org/sdr/QMLA2019112299087), Nov 19, 2019: ENGINE. MAKING METAL. DURING ROUTINE INSPECTION OF ENGINE CHIP DETECTORS FOUND NUMEROUS CHIPS AND DEBRIS ON BOTH UPPER AND LOWER CHIP PLUGS. AMOUNT AND SIZE EXCEEDED ALLOWABLE PER RO
- [SDR CA190716009](https://openairdocs.org/sdr/CA190716009), Jun 29, 2019: GYRO. FAULTY. (CAN) IT WAS REPORTED TO BELL:SHORTLY AFTER TAKEOFF, SMOKE STARTED TO FILL THE COCKPIT. THE PILOT TURNED OFF THE BATTERY, OPENED THE SIDE WINDOW, AND MADE AN EM
- [SDR 2019FA0000194](https://openairdocs.org/sdr/2019FA0000194), Jun 25, 2019: ENGINE. MAKING METAL. ENGINE CHIP LIGHT ILLUMINATED WHEN ENGINE WAS BROUGHT TO FLIGHT IDLE AFTER ENGINE START UP. MAINTENANCE FOUND 2 FLAKES WITHIN LIMITS ON THE UPPER CHIP PLUG.A 30
- [SDR CA190409008](https://openairdocs.org/sdr/CA190409008), Mar 26, 2019: BLADE. MISMANUFACTURED. (CAN) UPON INSTALLATION OF A SET OF NEW MAIN ROTOR BLADES IT WAS DISCOVERED THE ALIGNMENT PIN WAS MISSING FROM ONE OF THE NEW BLADES. PART NUMBER 206-010-200-15
- [SDR X2RA2018F00000](https://openairdocs.org/sdr/X2RA2018F00000), Dec 14, 2017: FUEL CONTROL. FAILED. PILOT EXPERIENCED DELAYED HOT AND ERRATIC STARTS. FOUND PLAY IN THE POINTER ROD, THIS WOULD AFFECT THE START SCHEDULING. THE SLOP IS WHERE THE POINTER ROD ENGAG
- [SDR HDNA20160917012](https://openairdocs.org/sdr/HDNA20160917012), Sep 17, 2016: ENGINE. MAKING METAL. AT CRUISE, THE MAG PLUG 2 WARNING LIGHT ILLUMINATED. REDUCED POWER TO ESTABLISH A SUITABLE OEI CONDITION AND CALLED FOR THE APPLICABLE RFM EMERGENCY PROCEDURE C
- [SDR K2DA20160308001](https://openairdocs.org/sdr/K2DA20160308001), Mar 5, 2016: BLADE. DELAMINATED. UPON THE DAILY INSPECTION, A COIN TAP TEST WAS PERFORMED ON THE TAIL ROTOR BLADES. TAIL ROTOR BLADE, PN 500P3100-105, SN C519 WAS DISCOVERED TO BE DELAMINATED. 
- [SDR 9EK2016F00000](https://openairdocs.org/sdr/9EK2016F00000), Feb 15, 2016: B-NUT. LOOSE. FOUND B-NUT LOOSE ON ENGINE THAT ATTACHES RETURN OIL LINE TO RESERVOIR. LINE DOES NOT HAVE ANY SAFETYING PROVISION. METAL FITTING ASSY WAS FOUND LOOSE NOT HOSE.
- [SDR 2016FA0000076](https://openairdocs.org/sdr/2016FA0000076), Feb 9, 2016: BLADE. DELAMINATED. UPON THE DAILY INSPECTION, A COIN TAP TEST WAS PERFORMED ON THE TAIL ROTOR BLADES AND BLADE WAS DISCOVERED TO BE DELAMINATED. THE DELAMINATION CONSISTS OF A 2" 
- [SDR K2DA20160107001](https://openairdocs.org/sdr/K2DA20160107001), Dec 31, 2015: BLADE. DELAMINATED. DURING DAILY INSPECTION, AFTER THE DAYS FLIGHTS, ONE OF THE TAIL ROTOR BLADES WAS FOUND TO HAVE VARIOUS SPOTS, VARYING IN LENGTH FROM .5 INCHES TO 2 INCHES, WHE
- [SDR DCGA2015FA0000622](https://openairdocs.org/sdr/DCGA2015FA0000622), Dec 3, 2015: ENGINE. MAKING METAL. PILOT GOT AN INTERMITTENT ENGINE CHIP LIGHT INDICATION AFTER TAKEOFF AND RETURNED FOR LANDING. MAINTENANCE FOUND LIGHT EXTINGUISHED BUT FOUND METAL ON UPPER AND
- [SDR 8MHR2015FA0000422](https://openairdocs.org/sdr/8MHR2015FA0000422), Aug 24, 2015: NOZZLE. FRACTURED. ENGINE WAS REPORTED TO HAVE N1 LOCKUP. ON DISASSEMBLY OF THE TURBINE, FOUND 6 OF THE 8 LOCATING TANGS SEPARATED FROM THE SECOND STAGE NOZZLE.
- [SDR QMLA2015081415072](https://openairdocs.org/sdr/QMLA2015081415072), Aug 14, 2015: SKIN. CRACKED. FOUND CRACK IN UPPER AFT FUSELAGE SKIN NEAR THE UPPER LT LONGERON AS DESCRIBED, THE SUBJECT OF AD2015-05-04 & ASB 407-11-95, TB 407-12-96. DURING THE COMPLIANCE
- [SDR ALGA0730201536129](https://openairdocs.org/sdr/ALGA0730201536129), Jul 15, 2015: BEARING. WORN. DURING CRUISE FLIGHT ENGINE CHIP LIGHT ILLUMINATED. LANDED ON AN OFFSHORE PLATFORM, EXAMINED CHIP PLUG FOUND METAL PARTICLES. UPON RECOVERY OF AIRCRAFT & SUBSEQ
- [SDR K2DA20150602001](https://openairdocs.org/sdr/K2DA20150602001), May 31, 2015: PUMP. FAILED. DURING CRUISE FLIGHT THE MAIN ROTOR TRANSMISSION LOW OIL PRESS LIGHT ELIMINATED. AN UNSCHEDULED PRECAUTIONARY LANDING WAS MADE IN AN OPEN FIELD WITHOUT INCIDENT
- [SDR K2DA2015FA0000256](https://openairdocs.org/sdr/K2DA2015FA0000256), May 31, 2015: PUMP. FAILED. DURING CRUISE FLIGHT, THE MAIN ROTOR TRANSMISSION LOW OIL PRESSURE LIGHT ELIMINATED. AN UNSCHEDULED PRECAUTIONARY LANDING WAS MADE IN AN OPEN FIELD WITHOUT INCI
- [SDR DCGA2015FA0000217](https://openairdocs.org/sdr/DCGA2015FA0000217), May 19, 2015: TURBINE. OUT OF TOLERANCE. PILOT REPORTED CHIRPING NOISE FROM ENGINE AT END OF DAY SHUTDOWN. MAINTENANCE REMOVED TURBINE ASSY FOR SUSPECT N2 RUBBING.
- [SDR QMLA2015041515029](https://openairdocs.org/sdr/QMLA2015041515029), Apr 15, 2015: HEATER. PILOT ERROR. FLIGHT CREW SMELLED HOT PLASTIC IN AFT CABIN AREA WHILE HEATER WAS IN USE. THIS IS AN ELECTRICALLY ACTUATED SYS, OPERATED BY THE PILOT. IF PILOT SELECTED SETTIN
- [SDR HDNA201502190004](https://openairdocs.org/sdr/HDNA201502190004), Feb 19, 2015: ENGINE. MAKING METAL. ON STARTUP NR 1 ENG CHIP LIGHT ILLUMINATED. UPON INSPECTION OF CHIP DETECTORS FOUND UPPER DETECTOR TO HAVE EXCESSIVE AMOUNTS OF METAL. R & R TURBINE.
- [SDR 2015FA0000049](https://openairdocs.org/sdr/2015FA0000049), Jan 30, 2015: SCISSORS. UNSERVICEABLE. INSTALLED THE O/H SCISSORS LINK AND WAS NOTIFIED BY THE CUSTOMER THAT ON A ROUTINE ALF CHECKS, ON THE ROTATING SCISSORS LINK THAT ABLE ENGINEERING HAD RE-BUSHED
- [SDR 2015FA0000003](https://openairdocs.org/sdr/2015FA0000003), Jan 8, 2015: BLADDER. LEAKING. SMALL PUDDLE OF FUEL FOUND ON THE GROUND UNDER THE BELLY OF THE ACFT AT PREFLIGHT. MAINTENANCE FOUND A SMALL PUNCTURE IN THE RT FUEL BLADDER OF AN UNCONFIRMED O
- [SDR FTYRN201410180001](https://openairdocs.org/sdr/FTYRN201410180001), Oct 27, 2014: COMBUSTION CASE. CRACKED. NOTED A HIGH TOT INDICATION ON APPROACH TO LAND AT HOME STATION. VISUALLY INSPECTED AND FOUND CRACK IN OUTER COMBUSTION CASE ASSEMBLY.
- [SDR CA140903012](https://openairdocs.org/sdr/CA140903012), Aug 24, 2014: BEARING. ROUGH. (CAN) AFTER LANDING AND DURING ENGINE WIND DOWN, A LOUD SQUEAL WAS HEARD COMING FROM THE AFT OF THE HELICOPTER. IT WAS DETERMINED THAT THE NOISE WAS EMANATING F
- [SDR K2DA20140701001](https://openairdocs.org/sdr/K2DA20140701001), Jul 1, 2014: PRESSURE SWITCH. FAULTY. MAIN ROTOR TRANSMISSION LOW OIL PRESS LIGHT ILLUMINATED IN FLIGHT PREFORMED PRECAUTIONARY LANDING. TRANSMISSION OIL PRESS SWITCH INOPERATIVE. REPLACED PRESS SWI
- [SDR IAVA201406110001](https://openairdocs.org/sdr/IAVA201406110001), May 30, 2014: COMBUSTION CASE. CRACKED. OUTER COMBUSTION CASE CRACKED ON THE RT SIDE UNDER WIRE REINFORCEMENT PATCH.
- [SDR K2DA20140427001](https://openairdocs.org/sdr/K2DA20140427001), Apr 27, 2014: SHAFT. WORN. TRANSMISSION OIL PRESS LIGHT DURING FLIGHT. PRECAUTIONARY LANDING PREFORMED. TRANSMISSION OIL PUMP INPUT SHAFT NOT PROPERLY SEATED & WORN. REPLACED INPUT SHAFT 
- [SDR DCGA2014042500280](https://openairdocs.org/sdr/DCGA2014042500280), Apr 23, 2014: WIRE. SHORTED. PILOT REPORTED AN ENGINE CHIP LIGHT. THE CHIP LIGHT WAS EXTINGUISHED WHEN CHIP PLUGS WERE REMOVED AND CLEANED. DURING OPS CHECKS THE LIGHT CAME BACK ON. MAINTEN
- [SDR WO5A2014042100261](https://openairdocs.org/sdr/WO5A2014042100261), Apr 1, 2014: BEARING. FAILED. OPERATOR EXPERIENCED ERRATIC ENGINE OPERATION INCLUDING INABILITY TO LIGHT OFF AS WELL AS UNCOMMANDED INCREASES IN N2 & NR SPEEDS. PILOT REPORTED THAT DURING LA
- [SDR CA130812003](https://openairdocs.org/sdr/CA130812003), Aug 10, 2013: BLADE. DAMAGED. (CAN) IN CRUISE FLIGHT THE PILOT NOTICED A CHANGE IN BLADE NOISE, LIKE PLASTIC BAG ON BLADE, WAS APPROXIMATELY 1 MILE FROM THE BASE, SHUTDOWN THE ACFT, AND CHEC
- [SDR CA130612006](https://openairdocs.org/sdr/CA130612006), Jun 5, 2013: ECU. FAILED. (CAN) 11 PM LOCAL TIME. THE PILOT MADE A NORMAL OUTBOUND FLIGHT AND SHUTDOWN AT A TRAUMA SCENE. 5 MINUTES INTO A 10 MINUTE RETURN FLIGHT THE FADEC DEGRADE LIGHT
- [SDR CA130509006](https://openairdocs.org/sdr/CA130509006), May 9, 2013: ELT. FAILED. (CAN) ELT FAILED POWER OUTPUT TEST FOR 121.5 MHZ AND 406 MHZ. UNIT FLASHED CODE INDICATING LO RF POWER. POWER CONFIRMED WITH BEACON TEST EQUIPMENT. ELT BATTERY 
- [SDR JBZA20130513003](https://openairdocs.org/sdr/JBZA20130513003), May 7, 2013: BLADE. DAMAGED. WHILE ENROUTE, ACFT HAD A BIRD STRIKE AT THE MAIN ROTOR SYS CAUSING A VIBRATION. CREW MADE A PRECAUTIONARY LANDING AT THE NEAREST AIRPORT. AFTER SHUTDOWN, PILOT
- [SDR CA130502011](https://openairdocs.org/sdr/CA130502011), May 2, 2013: GEARBOX. MAKING METAL. (CAN) ENGINE GEARBOX WAS O/H 7.6 HRS IN SERVICE AND THE PILOT REPORTED AN ENGINE CHIP LIGHT. UPON FURTHER INVESTIGATION OF THE CHIP PLUG, IT APPEARS TO BE A DRI
- [SDR AQH2013F00000](https://openairdocs.org/sdr/AQH2013F00000), Mar 11, 2013: STARTER GEN. FAILED. DURING NORMAL FLIGHT, THE PILOT REPORTED THE GENERATOR FAILED. THE HELICOPTER LANDED WITHOUT INCIDENT. SUBSEQUENT INVESTIGATION BY THE PILOT INDICATED THE START
- [SDR 2013FA0000553](https://openairdocs.org/sdr/2013FA0000553), Jan 22, 2013: BULKHEAD. CRACKED. BULKHEAD CRACKED IN LT AFT GEARBOX ATTACHMENT HOLE. CRACKING FOUND VISUALLY DURING CORROSION INSPECTION.
- [SDR CA130110005](https://openairdocs.org/sdr/CA130110005), Jan 9, 2013: GOVERNOR. MALFUNCTIONED. (CAN) PREFLIGHT INSPECTION OF ACFT REVEALED GOVERNOR BIASING SHAFT, PN 206-062-717-1, ON TRANSMISSION DECK TWISTED AT SHEAR POINT. LINEAR ACTUATOR ARM REMOVED A
- [SDR CA130109010](https://openairdocs.org/sdr/CA130109010), Jan 7, 2013: HOUSING. FAILED. (CAN) THE BEARING HOUSING WAS REMOVED FROM COMPRESSOR ASSEMBLY DUE TO LOW POWER, AND WAS INDUCTED INTO THE SHOP. BEARING HOUSING AND NUT, WITH SHEARED PORTION O
- [SDR 2013FA0000552](https://openairdocs.org/sdr/2013FA0000552), Dec 17, 2012: BULKHEAD. CRACKED. BULKHEAD CRACKED IN LT AFT GEARBOX ATTACHMENT HOLE. CRACKING WAS FOUND VISUALLY DURING CORROSION INSPECTION.
- [SDR CA121205011](https://openairdocs.org/sdr/CA121205011), Dec 5, 2012: ELT. MALFUNCTIONED. (CAN) DURING THE SELF TEST OF THE ELT USING THE REMOTE SWITCH THE SYSTEM RESPONDED WITH AN ERROR CODE OF 3+2 FLASHES INDICATING A LOW RF POWER FAULT. FAULT WAS 
- [SDR CA121203008](https://openairdocs.org/sdr/CA121203008), Dec 1, 2012: HEATER. SHORTED. (CAN) SHROUD HEATER NOT WORKING. HEATER CIRCUIT BREAKER TRIPPED. HEATER MOTOR ROUGH TO TURN AND SHORTING OUT INTERNALLY. MOTOR REPLACED.
- [SDR CA121023008](https://openairdocs.org/sdr/CA121023008), Oct 19, 2012: ENCODER. FAILED. (CAN) ATC REPORTED THAT ACFT WAS NOT REPORTING MODE C. INSPECTION OF ENCODER FOUND WATER ON THE CIRCUIT BOARD WHICH LEAD TO A SHORT. ENCODER REPLACED. MAINTENAN
- [SDR CA121010010](https://openairdocs.org/sdr/CA121010010), Oct 10, 2012: PIN. FAILED. (CAN) WHILE DOING PREFLIGHT CHECKS FOR A TRAINING FLIGHT WITH DUAL PILOTS AND DUAL CONTROLS INSTALLED, TRAINING PILOT WAS IN THE LT SEAT DURING START-UP. ONCE A
- [SDR CA120905008](https://openairdocs.org/sdr/CA120905008), Sep 5, 2012: DRIVE SHAFT. OVERTEMP. (CAN) DURING 100 HR INSPECTION THE DRIVESHAFT TELI-TEMP INDICATORS SHOWED DRIVESHAFT COUPLING WAS OVERTEMPED. DRIVESHAFT RAN 151 HOURS SINCE LAST O/H.
- [SDR CA120905010](https://openairdocs.org/sdr/CA120905010), Sep 5, 2012: STARTER GEN. NOISY. (CAN) NOISE IN ACFT AUDIO SYS WHEN STARTER GENERATOR SWITCHED ON. STARTER GENERATOR REPLACED.
- [SDR K2DA201209070502](https://openairdocs.org/sdr/K2DA201209070502), Sep 2, 2012: ENGINE. WARNING LIGHT. ENGINE CHIP LIGHT ILLUMINATED DURING FLIGHT. PRECAUTIONARY LANDING PERFORMED AND ENGINE SHUTDOWN. MX DISPATCHED WITH COMPANY ACFT AND PASSENGERS WERE FLOWN FOR 
- [SDR CA120905012](https://openairdocs.org/sdr/CA120905012), Aug 25, 2012: FUEL CONTROL. FAILED. (CAN) DURING START, ALL NRS AND TEMPERATURES WERE NORMAL AT 40 PERCENT N1 ENGINE FLAMED OUT AS IF FUEL WAS CUTOFF. FUEL CONTROL REPLACED.
- [SDR CA120905009](https://openairdocs.org/sdr/CA120905009), Aug 23, 2012: GOVERNOR. MALFUNCTIONED. (CAN) GOVERNOR WILL NOT RECOVER FROM OVERSPEED WHEN COLLECTIVE DECREASED.

All 945: https://openairdocs.org/engine/allison-250-c20-series/reports.md

## STCs that may be installed (OpenAirDocs) (8)

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 SE2352NM](https://openairdocs.org/stc/SE2352NM): Modification of turbine engine. Fifty-Ten-Yankee LLC. Lists 250-C20S
- [STC SE5511NM](https://openairdocs.org/stc/SE5511NM): Installation of compressor discharge pressue (PC) valve. Bell Helicopter Textron Inc
- [STC SE769NW](https://openairdocs.org/stc/SE769NW): Installation of Soloy Part No. 250-1001-1 fuel line. Siam Hiller Holdings Inc
- [STC SE00014EN](https://openairdocs.org/stc/SE00014EN): Installation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/N HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models. Pratt & Whitney Engine Services Inc. Lists 250-C20B
- [STC SE00027EN](https://openairdocs.org/stc/SE00027EN): Installation of Pratt & Whitney Engine Services Inc. Intellistart plus electronic control unit (ECU), P/N DPU-K-010 on the specified 250 engine models. Pratt & Whitney Engine Services Inc
- [STC SE492GL](https://openairdocs.org/stc/SE492GL): Incorporation of a fuel flow transducer. Shadin Avionics
- [STC ST00037AT](https://openairdocs.org/stc/ST00037AT): Unison igniter plugs, P/N 9044400-1. Unison Industries
- [STC SQ00338AT](https://openairdocs.org/stc/SQ00338AT): Unison igniter leads, P/N9048222-101, 102, 103, 104, 105, 106. Unison Industries

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