# Allison 250-C20B - Type: Engine model (FAA registry) - Registry code: 03081 - Manufacturer (registry): ALLISON - Model: 250-C20B - Engine type: Turbo-shaft - Power: 420 hp - Data sheet: [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 113 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c20b Model codes come from the FAA registry's reference file. ## ADs that may apply (OpenAirDocs) Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 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 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 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 ## Registered aircraft (113, first 50) - [N104RL](https://openairdocs.org/aircraft/N104RL): [Vertical Vegetation Management LLC](https://openairdocs.org/faa-owner/VERTICAL%20VEGETATION%20MANAGEMENT%20LLC), [Darlington, IN](https://openairdocs.org/faa-place/IN/Darlington), S/N 4315 - [N107SF](https://openairdocs.org/aircraft/N107SF): [Dah Aircraft LLC](https://openairdocs.org/faa-owner/DAH%20AIRCRAFT%20LLC), [Georgetown, SC](https://openairdocs.org/faa-place/SC/Georgetown), built 1978, S/N 1280405D - [N1080N](https://openairdocs.org/aircraft/N1080N): [Reynolds Aviation LLC](https://openairdocs.org/faa-owner/REYNOLDS%20AVIATION%20LLC), [Wills Point, TX](https://openairdocs.org/faa-place/TX/Wills%20Point), built 1981, S/N 3549 - [N1085B](https://openairdocs.org/aircraft/N1085B): [Del Rio Aviation Inc](https://openairdocs.org/faa-owner/DEL%20RIO%20AVIATION%20INC), [Paso Robles, CA](https://openairdocs.org/faa-place/CA/Paso%20Robles), built 1980, S/N 2908 - [N108EC](https://openairdocs.org/aircraft/N108EC): [Hva Inc](https://openairdocs.org/faa-owner/HVA%20INC), [Summersville, WV](https://openairdocs.org/faa-place/WV/Summersville), built 1982, S/N 811049D - [N1097J](https://openairdocs.org/aircraft/N1097J): [Signature Property Holdings LLC](https://openairdocs.org/faa-owner/SIGNATURE%20PROPERTY%20HOLDINGS%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1980, S/N 900801D - [N109LB](https://openairdocs.org/aircraft/N109LB): [Vertol Systems Company Inc](https://openairdocs.org/faa-owner/VERTOL%20SYSTEMS%20COMPANY%20INC), [Destin, FL](https://openairdocs.org/faa-place/FL/Destin), built 1991, S/N 0455E - [N109WJ](https://openairdocs.org/aircraft/N109WJ): [L S Service Corp](https://openairdocs.org/faa-owner/L%20S%20SERVICE%20CORP), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1982, S/N 7218 - [N10BK](https://openairdocs.org/aircraft/N10BK): [Riley Jake](https://openairdocs.org/faa-owner/RILEY%20JAKE), [New York, NY](https://openairdocs.org/faa-place/NY/New%20York), built 1981, S/N 6051 - [N115EC](https://openairdocs.org/aircraft/N115EC): [Sara Helicopters Inc](https://openairdocs.org/faa-owner/SARA%20HELICOPTERS%20INC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1971, S/N 110292S - [N115HD](https://openairdocs.org/aircraft/N115HD): [Laroche Aviation Services LLC](https://openairdocs.org/faa-owner/LAROCHE%20AVIATION%20SERVICES%20LLC), [Bellaire, OH](https://openairdocs.org/faa-place/OH/Bellaire), built 1981, S/N 711020D - [N131NW](https://openairdocs.org/aircraft/N131NW): [Emerald City Aircraft Leasing Inc](https://openairdocs.org/faa-owner/EMERALD%20CITY%20AIRCRAFT%20LEASING%20INC), [Port Orchard, WA](https://openairdocs.org/faa-place/WA/Port%20Orchard), built 1982, S/N 1131D - [N134MS](https://openairdocs.org/aircraft/N134MS): [Sunny Sky LLC](https://openairdocs.org/faa-owner/SUNNY%20SKY%20LLC), [Stacyville, IA](https://openairdocs.org/faa-place/IA/Stacyville), built 1977, S/N 2226 - [N137M](https://openairdocs.org/aircraft/N137M): [Scotts Helicopter Services Inc](https://openairdocs.org/faa-owner/SCOTTS%20HELICOPTER%20SERVICES%20INC), [Le Sueur, MN](https://openairdocs.org/faa-place/MN/Le%20Sueur), built 1978, S/N 2575 - [N144BH](https://openairdocs.org/aircraft/N144BH): [Abc Helicopters Inc](https://openairdocs.org/faa-owner/ABC%20HELICOPTERS%20INC), [Jefferson, WI](https://openairdocs.org/faa-place/WI/Jefferson), built 1975, S/N 1600 - [N145AL](https://openairdocs.org/aircraft/N145AL): [Quicksilver Air Inc](https://openairdocs.org/faa-owner/QUICKSILVER%20AIR%20INC), [Fairbanks, AK](https://openairdocs.org/faa-place/AK/Fairbanks), built 1980, S/N 1200856D - [N151EC](https://openairdocs.org/aircraft/N151EC): [Ecolift Corp](https://openairdocs.org/faa-owner/ECOLIFT%20CORP), [San Juan, PR](https://openairdocs.org/faa-place/PR/San%20Juan), built 1969, S/N MB-1 - [N156CA](https://openairdocs.org/aircraft/N156CA): [Chem-Air LLC](https://openairdocs.org/faa-owner/CHEM-AIR%20LLC), [Shreveport, LA](https://openairdocs.org/faa-place/LA/Shreveport), built 1976, S/N 1999 - [N161LA](https://openairdocs.org/aircraft/N161LA): [Air2 LLC](https://openairdocs.org/faa-owner/AIR2%20LLC), [Blountville, TN](https://openairdocs.org/faa-place/TN/Blountville), built 1981, S/N 711015D - [N165H](https://openairdocs.org/aircraft/N165H): [Midvale Air Research LLC](https://openairdocs.org/faa-owner/MIDVALE%20AIR%20RESEARCH%20LLC), [Lewes, DE](https://openairdocs.org/faa-place/DE/Lewes), built 1985, S/N 0150E - [N16810](https://openairdocs.org/aircraft/N16810): [Southern Helicopter Services Inc](https://openairdocs.org/faa-owner/SOUTHERN%20HELICOPTER%20SERVICES%20INC), [Millington, TN](https://openairdocs.org/faa-place/TN/Millington), built 1977, S/N 2231 - [N16979](https://openairdocs.org/aircraft/N16979): [Withrotor Aviation Inc](https://openairdocs.org/faa-owner/WITHROTOR%20AVIATION%20INC), [Lakeview, OR](https://openairdocs.org/faa-place/OR/Lakeview), S/N 2346 - [N169AA](https://openairdocs.org/aircraft/N169AA): [Pierce Associates LLC](https://openairdocs.org/faa-owner/PIERCE%20ASSOCIATES%20LLC), [Prineville, OR](https://openairdocs.org/faa-place/OR/Prineville), built 1973, S/N 990 - [N173AL](https://openairdocs.org/aircraft/N173AL): [Fulton Timothy E](https://openairdocs.org/faa-owner/FULTON%20TIMOTHY%20E), [Salem, MO](https://openairdocs.org/faa-place/MO/Salem), built 1976, S/N 1160020D - [N198H](https://openairdocs.org/aircraft/N198H): [Industrial Helicopters LLC](https://openairdocs.org/faa-owner/INDUSTRIAL%20HELICOPTERS%20LLC), [Lafayette, LA](https://openairdocs.org/faa-place/LA/Lafayette), built 1982, S/N 3647 - [N201SM](https://openairdocs.org/aircraft/N201SM): [Demo Salvage Inc](https://openairdocs.org/faa-owner/DEMO%20SALVAGE%20INC), [Calais, ME](https://openairdocs.org/faa-place/ME/Calais), built 1981, S/N 3389 - [N206AB](https://openairdocs.org/aircraft/N206AB): [Blue Sky Air Services LLC](https://openairdocs.org/faa-owner/BLUE%20SKY%20AIR%20SERVICES%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1972, S/N 9053 - [N206JT](https://openairdocs.org/aircraft/N206JT): [Turner Jeffrey A](https://openairdocs.org/faa-owner/TURNER%20JEFFREY%20A), [Birch Run, MI](https://openairdocs.org/faa-place/MI/Birch%20Run), built 1978, S/N 2545 - [N206PH](https://openairdocs.org/aircraft/N206PH): [Taz Investments LLC](https://openairdocs.org/faa-owner/TAZ%20INVESTMENTS%20LLC), [New Iberia, LA](https://openairdocs.org/faa-place/LA/New%20Iberia), built 1969, S/N 431 - [N206TH](https://openairdocs.org/aircraft/N206TH): [Ranger Aviation Leasing LLC](https://openairdocs.org/faa-owner/RANGER%20AVIATION%20LEASING%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1975, S/N 1736 - [N220SA](https://openairdocs.org/aircraft/N220SA): [Spurger Aviation LLC](https://openairdocs.org/faa-owner/SPURGER%20AVIATION%20LLC), [Spurger, TX](https://openairdocs.org/faa-place/TX/Spurger), built 1969, S/N 476 - [N2299U](https://openairdocs.org/aircraft/N2299U): [Cb Couch Inc](https://openairdocs.org/faa-owner/CB%20COUCH%20INC), [Walcott, AR](https://openairdocs.org/faa-place/AR/Walcott), built 1981, S/N 3415 - [N22NH](https://openairdocs.org/aircraft/N22NH): [Schuh Roger J](https://openairdocs.org/faa-owner/SCHUH%20ROGER%20J), [Chowchilla, CA](https://openairdocs.org/faa-place/CA/Chowchilla), built 1974, S/N 1547 - [N249WW](https://openairdocs.org/aircraft/N249WW): [Larson Helicopters LLC](https://openairdocs.org/faa-owner/LARSON%20HELICOPTERS%20LLC), [Perham, MN](https://openairdocs.org/faa-place/MN/Perham), built 1979, S/N 2882 - [N255SP](https://openairdocs.org/aircraft/N255SP): [Phoenix Precision Air LLC](https://openairdocs.org/faa-owner/PHOENIX%20PRECISION%20AIR%20LLC), [Centreville, MI](https://openairdocs.org/faa-place/MI/Centreville), S/N 2407 - [N2650](https://openairdocs.org/aircraft/N2650): [North Texas Helicopters Inc](https://openairdocs.org/faa-owner/NORTH%20TEXAS%20HELICOPTERS%20INC), [Newark, TX](https://openairdocs.org/faa-place/TX/Newark), built 1979, S/N 2650 - [N267MW](https://openairdocs.org/aircraft/N267MW): [Pacific Valley Aviation Inc](https://openairdocs.org/faa-owner/PACIFIC%20VALLEY%20AVIATION%20INC), [Arbuckle, CA](https://openairdocs.org/faa-place/CA/Arbuckle), built 1980, S/N 3149 - [N27758](https://openairdocs.org/aircraft/N27758): [Dragonfly Aviation LLC](https://openairdocs.org/faa-owner/DRAGONFLY%20AVIATION%20LLC), [Saint Ansgar, IA](https://openairdocs.org/faa-place/IA/Saint%20Ansgar), built 1979, S/N 2791 - [N357MH](https://openairdocs.org/aircraft/N357MH): [Aa Leasing Lp](https://openairdocs.org/faa-owner/AA%20LEASING%20LP), [Kilauea, HI](https://openairdocs.org/faa-place/HI/Kilauea), built 1982, S/N 1171D - [N369EH](https://openairdocs.org/aircraft/N369EH): [Applebee Aviation Inc](https://openairdocs.org/faa-owner/APPLEBEE%20AVIATION%20INC), [Banks, OR](https://openairdocs.org/faa-place/OR/Banks), built 1980, S/N 1200861D - [N369JH](https://openairdocs.org/aircraft/N369JH): [Jack Harter Helicopters Inc](https://openairdocs.org/faa-owner/JACK%20HARTER%20HELICOPTERS%20INC), [Lihue, HI](https://openairdocs.org/faa-place/HI/Lihue), built 1985, S/N 0145E - [N369TR](https://openairdocs.org/aircraft/N369TR): [Chehalem Helicopters LLC](https://openairdocs.org/faa-owner/CHEHALEM%20HELICOPTERS%20LLC), [Newberg, OR](https://openairdocs.org/faa-place/OR/Newberg), built 1977, S/N 570141D - [N369WY](https://openairdocs.org/aircraft/N369WY): [Reece Construction Company](https://openairdocs.org/faa-owner/REECE%20CONSTRUCTION%20COMPANY), [Marysville, WA](https://openairdocs.org/faa-place/WA/Marysville), built 1981, S/N 510976D - [N37WA](https://openairdocs.org/aircraft/N37WA): [Boston Executive Helicopters LLC](https://openairdocs.org/faa-owner/BOSTON%20EXECUTIVE%20HELICOPTERS%20LLC), [Norwood, MA](https://openairdocs.org/faa-place/MA/Norwood), built 1981, S/N 3433 - [N39MK](https://openairdocs.org/aircraft/N39MK): [Xtreme Aviation LLC](https://openairdocs.org/faa-owner/XTREME%20AVIATION%20LLC), [Falkville, AL](https://openairdocs.org/faa-place/AL/Falkville), built 1980, S/N 2984 - [N41WE](https://openairdocs.org/aircraft/N41WE): [Eastward Aviation Inc](https://openairdocs.org/faa-owner/EASTWARD%20AVIATION%20INC), [Eagle Lake, TX](https://openairdocs.org/faa-place/TX/Eagle%20Lake), S/N 3850 - [N43HH](https://openairdocs.org/aircraft/N43HH): [Johnson Flying Service LLC](https://openairdocs.org/faa-owner/JOHNSON%20FLYING%20SERVICE%20LLC), [Exira, IA](https://openairdocs.org/faa-place/IA/Exira), built 1975, S/N 1585 - [N444TV](https://openairdocs.org/aircraft/N444TV): [Scotts Helicopter Service Inc](https://openairdocs.org/faa-owner/SCOTTS%20HELICOPTER%20SERVICE%20INC), [Le Sueur, MN](https://openairdocs.org/faa-place/MN/Le%20Sueur), built 1981, S/N 3501 - [N451HA](https://openairdocs.org/aircraft/N451HA): [Iron Horse Aviation LLC](https://openairdocs.org/faa-owner/IRON%20HORSE%20AVIATION%20LLC), [Marshalltown, IA](https://openairdocs.org/faa-place/IA/Marshalltown), built 1979, S/N 490484D - [N454JH](https://openairdocs.org/aircraft/N454JH): [Jack Harter Helicopters Inc](https://openairdocs.org/faa-owner/JACK%20HARTER%20HELICOPTERS%20INC), [Lihue, HI](https://openairdocs.org/faa-place/HI/Lihue), built 1991, S/N 0454E All 113: https://openairdocs.org/engine/allison-250-c20b/aircraft.md ## NTSB investigations (31) 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 WPR26FA054](https://openairdocs.org/ntsb/WPR26FA054), Dec 5, 2025: Hughes 369D (N161LA), Pryor, OK, substantial damage, 1 fatal, investigation ongoing - [NTSB CEN25FA307](https://openairdocs.org/ntsb/CEN25FA307), Aug 7, 2025: Hughes 369D (N173AL), West Alton, MO, destroyed, 2 fatal. Probable cause: The pilot’s failure to maintain helicopter clearance from the powerline during the powerline maintenance operation for reasons that could not be determined. - [NTSB ERA23LA293](https://openairdocs.org/ntsb/ERA23LA293), Jul 9, 2023: Hughes 369D (N5027P), Waldorf, MD, substantial damage. Probable cause: Fatigue failure of the overrunning clutch outer race and a subsequent inflight loss of power due to abnormal bending loads as a result of improper reassembly of the clutch subassembly following… - [NTSB GAA23WA214](https://openairdocs.org/ntsb/GAA23WA214), Jun 23, 2023: Bell 206B (N717LM), Thetford Mines, Canada, substantial damage - [NTSB CEN22LA351](https://openairdocs.org/ntsb/CEN22LA351), Aug 1, 2022: Bell Helicopter Textron 206B (N169AA), Arcadia, IA, substantial damage. Probable cause: Maintenance personnel’s failure to properly torque a fuel control unit B-nut, which resulted in a loss of engine power at low altitude and an impact with terrain. - [NTSB ERA22LA330](https://openairdocs.org/ntsb/ERA22LA330), Jul 21, 2022: Bell 206B (N39MK), Kenton, OH, substantial damage. Probable cause: The pilot’s inadequate fuel management, which resulted in fuel exhaustion and a loss of engine power. - [NTSB ERA22LA342](https://openairdocs.org/ntsb/ERA22LA342), Jun 30, 2022: Messerschmitt-Boelkow-Blohm BO_105S (N160TH), Daytona Beach, FL, substantial damage. Probable cause: The pilot’s rapid reduction of collective following an in-flight loss of control while lifting from a dolly resulting in a hard landing. Contributing to the loss of control was the pilot’s likely… - [NTSB CEN21LA102](https://openairdocs.org/ntsb/CEN21LA102), Dec 29, 2020: Hughes 369D (N103SU), Tuckers Crossing, MS, destroyed, 1 fatal. Probable cause: The pilot’s loss of helicopter control when the external saw contacted trees during an attempted emergency landing due to a main rotor transmission oil pressure warning. The reason that the pilot did… - [NTSB GAA19CA457](https://openairdocs.org/ntsb/GAA19CA457), Jul 27, 2019: Bell 206 (N454MS), Dukedom, TN, substantial damage. Probable cause: The pilot's failure to maintain clearance from wires during an agricultural application flight. - [NTSB GAA19CA186](https://openairdocs.org/ntsb/GAA19CA186), Mar 29, 2019: Bell 206 (N83181), Valley Center, CA, substantial damage. Probable cause: The ground crew’s attachment of the load fill hose to the helicopter without telling the pilot, which resulted in a loss of helicopter control during takeoff. - [NTSB WPR18CA100](https://openairdocs.org/ntsb/WPR18CA100), Feb 19, 2018: Hughes 369D (N501VS), Pacific Ocean, Marshall Islands, substantial damage. Probable cause: An in-flight mechanical malfunction with the helicopter, which necessitated a ditching in the ocean. The reason for the malfunction could be determined because the helicopter sank and was not… - [NTSB ERA17WA060](https://openairdocs.org/ntsb/ERA17WA060), Nov 19, 2016: Agusta A109A II (N109W), Varese, Italy, destroyed, 1 fatal - [NTSB CEN17FA012](https://openairdocs.org/ntsb/CEN17FA012), Oct 6, 2016: Fairchild Hiller FH 1100 (N4035G), Lino Lakes, MN, destroyed, 2 fatal. Probable cause: The separation of the main rotor assembly due to mast bumping. - [NTSB WPR16FA072](https://openairdocs.org/ntsb/WPR16FA072), Feb 18, 2016: Bell 206B (N80918), Honolulu, HI, substantial damage, 1 fatal. Probable cause: The in-flight failure of the engine-to-transmission drive shaft due to improper maintenance, which resulted in low main rotor rpm and a subsequent hard landing to water. - [NTSB WPR13CA406](https://openairdocs.org/ntsb/WPR13CA406), Sep 12, 2013: Hughes 369D (N519PA), Kalalau, HI, substantial damage. Probable cause: The entanglement of a tarp in the helicopter's main rotor from a nearby trash bundle. - [NTSB CEN13LA487](https://openairdocs.org/ntsb/CEN13LA487), Aug 10, 2013: Bell 206B (N804LA), Albers, IL, substantial damage. Probable cause: Fuel contamination, which resulted in the loss of engine power. - [NTSB CEN13CA281](https://openairdocs.org/ntsb/CEN13CA281), May 15, 2013: Hughes 369D (N725M), Camdenton, MO, substantial damage. Probable cause: The piece of wood/tree that contacted the main rotor blade during the low altitude tree-trimming flight. - [NTSB ERA13LA057](https://openairdocs.org/ntsb/ERA13LA057), Nov 15, 2012: Hughes 369D (N369AW), Corning, NY, substantial damage, 2 fatal. Probable cause: The pilot’s failure to maintain adequate altitude while conducting a power line aerial observation flight, which resulted in an in-flight collision with wires. Contributing to the accident was the… - [NTSB ERA12CA304](https://openairdocs.org/ntsb/ERA12CA304), Apr 27, 2012: Bell 206B (N16EP), Hershey, PA, substantial damage. Probable cause: The pilot's diverted attention while performing aerial application at low altitude, which resulted in controlled flight into terrain. Contributing to the accident was the pilot’s failure to adjust… - [NTSB CEN12LA141](https://openairdocs.org/ntsb/CEN12LA141), Jan 22, 2012: Bell 206B (N555NB), Irving, TX, substantial damage. Probable cause: A total loss of engine power due to fuel exhaustion as a result of the pilot’s inadequate fuel planning. - [NTSB WPR10CA364](https://openairdocs.org/ntsb/WPR10CA364), Jul 24, 2010: Bell 206 B II (N788BD), Big Bear City, CA, substantial damage. Probable cause: The pilot's failure to maintain directional control during the landing approach. - [NTSB ERA09LA031](https://openairdocs.org/ntsb/ERA09LA031), Oct 30, 2008: Hughes 369D (N606AS), Carroll Township, PA, substantial damage. Probable cause: A total loss of engine power due to the improper assembly of the compressor discharge tubes to the combustion liner. - [NTSB MIA07LA148](https://openairdocs.org/ntsb/MIA07LA148), Sep 5, 2007: Bell 206B3 (N267MW), Lakeland, FL, substantial damage. Probable cause: The failure of company maintenance personnel to replace the tail rotor drive shafts following tail rotor blade damage in 1999, the failure of maintenance personnel to replace the tail rotor drive… - [NTSB MIA06LA126](https://openairdocs.org/ntsb/MIA06LA126), Jun 8, 2006: Fairchild Hiller FH-1100 (N4035G), Navarre, FL, substantial damage. Probable cause: The inadequate manufacturing of the plates of the tail rotor tension-torsion bar assembly resulting in fatigue failure. - [NTSB MIA05CA160](https://openairdocs.org/ntsb/MIA05CA160), Sep 23, 2005: Bell 206B3 (N39MK), Titusville, FL, substantial damage. Probable cause: The flight instructor's improper flare resulting in a hard landing and main rotor contact with tail boom. - [NTSB BFO94LA155](https://openairdocs.org/ntsb/BFO94LA155), Aug 28, 1994: Hughes 369D (N5027P), Butler, PA, substantial damage. Probable cause: The malfunction of the emergency fuel vent and the exhaustion of the fuel supply which resulted in the loss of engine power. - [NTSB LAX94LA076](https://openairdocs.org/ntsb/LAX94LA076), Dec 22, 1993: Hughes 369D (N115HD), Waimea, Kauai, HI, substantial damage. Probable cause: AN INADEQUATE ENGINE COMPRESSOR CLEANING PROCEDURE SPECIFIED IN THE MANUFACTURER'S SERVICE LETTER, WHICH RESULTED IN THE TOTAL LOSS OF ENGINE POWER DUE TO CONTAMINATION, BLOCKAGE, AND COLLAPSE OF THE… - [NTSB DEN85LA079](https://openairdocs.org/ntsb/DEN85LA079), Feb 18, 1985: Hiller FH-1100 (N4035G), Steamboat Sprng, CO, substantial damage - [NTSB NYC84LA204](https://openairdocs.org/ntsb/NYC84LA204), Jun 7, 1984: Hughes 500D (N5106Y), Bedford, PA, substantial damage - [NTSB FTW80DA117](https://openairdocs.org/ntsb/FTW80DA117), Sep 16, 1980: Bell 206B (N27758), Intracstl Cy, LA, substantial damage - [NTSB DEN79FA046](https://openairdocs.org/ntsb/DEN79FA046), Jun 24, 1979: Bell 206B (N16810), Gobernador, NM, substantial damage ## FAA accident and incident reports (42) 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 20251205019029A](https://openairdocs.org/incident/20251205019029A), Dec 5, 2025: Hughes 369D (N161LA), Pryor, OK, Substantial damage, 1 fatal. On December 5, 2025, at approximately 0900, a Hughes 369D helicopter was hovering over a tree line while performing observer duties for powerline workers.… - [Accident 20250807011249A](https://openairdocs.org/incident/20250807011249A), Aug 7, 2025: Hughes 369D (N173AL), West Alton, MO, Destroyed, 2 fatal. On August 7, 2025, approximately 11:06 CST, a Hughes (MD helicopters) 369D helicopter was destroyed after the tail of the helicopter struck a guide wire, which… - [Accident 20230709009939A](https://openairdocs.org/incident/20230709009939A), Jul 9, 2023: Hughes 369D (N5027P), Waldorf, MD, Substantial damage. Pilot was in cruise flight recovering from power line survey commercial flight to indian head, MD (2W5), due to incoming weather system. Approximately 6 mi se… - [Accident 20220801007599A](https://openairdocs.org/incident/20220801007599A), Aug 1, 2022: Bell Helicopter Textron 206B (N169AA), Arcadia, IA, Substantial damage. Loss of power aircraft and descended resulting in a hard landing. - [Accident 20220721007799A](https://openairdocs.org/incident/20220721007799A), Jul 21, 2022: Bell 206B (N39MK), Kenton, OH, Destroyed. The pilot was conducting spraying application (pesticide) on crops (corn) he noticed a drop in engine RPM and didn't know if it was a faulty gauge or fuel… - [Accident 20220630011529A](https://openairdocs.org/incident/20220630011529A), Jun 30, 2022: Messerschmitt-Boelkow-Blohm BO-105S (N160TH), Port Orange, FL, Substantial damage. On June 30 2022 around 0642, N160TH helicopter started to lift off helipad dolly once weight was remove from the skids the helicopter started an uncommand… - [Accident 20201229020189A](https://openairdocs.org/incident/20201229020189A), Dec 29, 2020: Hughes 369D (N103SU), Tuckers Crossin, MS, Destroyed, 1 fatal. On December 29, 2020 at about 08:36 CST (1436 UTC), a Hughes (MD helicopters, inc.) model 369D helicopter, FAA registration N103SU, impacted terrain south-east… - [Incident 20200731011869I](https://openairdocs.org/incident/20200731011869I), Jul 31, 2020: Bell 206B (N16810), Hubbard, NE, Minor damage. Helicopter conducting aerial spraying hit a power line. Pilot stated he had been passing under the wires for several passes, but on the last pass allowed his… - [Accident 20190727023029A](https://openairdocs.org/incident/20190727023029A), Jul 27, 2019: Bell 206B (N454MS), Dresden, TN, Destroyed. On July 27, 2019 at 1721 local time, the pilot was flying under part 137 commercial aerial spraying operations for couch helicopter service inc. aircraft… - [Accident 20190329002159A](https://openairdocs.org/incident/20190329002159A), Mar 29, 2019: Bell 206B (N83181), Valley Center, CA, Destroyed. Pilot was doing an aerial application. He landed on top of his reloading truck. Pilot indicated that he attempted to lift off, prior to the reloading hose… - [Accident 20180220023069A](https://openairdocs.org/incident/20180220023069A), Feb 20, 2018: Hughes HU-369 (N501VS), Int'L Waters, Destroyed. Pilot stated that while performing tuna spotting at 500', heard a loud noise in the main rotor system followed by lateral shaking of cyclic. Pilot turned back… - [Accident 20161006019169A](https://openairdocs.org/incident/20161006019169A), Oct 6, 2016: Fairchild Hiller FH-1100 (N4035G), Lino Lakes, MN, Destroyed, 2 fatal. Aircraft encountered an in flight breakup near Lino Lakes, MN. - [Incident 20160527007979I](https://openairdocs.org/incident/20160527007979I), May 27, 2016: Mcdonnell Douglas Helicopter 369E (N454JH), Lihue, HI, Minor damage. During a preflight inspection damage was discovered on some of the main rotor blades on N454JH. The pilot notified the director of maintenance, who inspected… - [Accident 20160218017839A](https://openairdocs.org/incident/20160218017839A), Feb 18, 2016: Bell 206B (N80918), Honolulu, HI, Substantial damage, 1 fatal. On February 18, 2016, about 1020 hawaiian aleutain standard time, a Bell 206B, N80918, was substantially damaged when it impacted water during an emergency… - [Incident 20151118023179I](https://openairdocs.org/incident/20151118023179I), Nov 18, 2015: Messerschmitt-Boelkow-Blohm-Gm BO-105C (N911AK), Arecibo, PR, No damage. During the approach for landing into abo airport, aircraft N911AK collective control jammed. The PIC decided to go for a running-landing when the helicopter… - [Accident 20130912022659A](https://openairdocs.org/incident/20130912022659A), Sep 12, 2013: Hughes 369D (N519PA), Kekaha, HI, Destroyed. Aircraft had just landed in a remote landing zone to drop off two passengers and start slinging bundles of camping gear out of the area via a long line. Pilot… - [Accident 20130810015519A](https://openairdocs.org/incident/20130810015519A), Aug 10, 2013: Bell 206A (N804LA), Albers, IL, Substantial damage. The pilot of N804LA, a Bell-206 helicopter had just departed a private business location in Albers, Illinois, to a location near pevely, Missouri. He had… - [Incident 20130803015349I](https://openairdocs.org/incident/20130803015349I), Aug 3, 2013: Agusta Spa A109A (N109WJ), Ft. Lauderdale, FL, Minor damage. Aircraft experienced a utility hydraulic system leak. The landing gear failed to extend with normal gear extension procedures. The landing gear emergency… - [Accident 20130515010769A](https://openairdocs.org/incident/20130515010769A), May 15, 2013: Hughes 369D (N725M), Camdenton, MO, Substantial damage. While trimming trees from a powerline right-of-way two miles south of Camdenton, Missouri, the pilot observed a piece of tree debris coming up from the saw… - [Incident 20130405007929I](https://openairdocs.org/incident/20130405007929I), Apr 5, 2013: Hughes 369D (N520PA), Lihue, HI, Minor damage. Pilot departed a confined area in the waimea canyon. Pilot noticed collective was lighter than normal feel while enroute. Pilot landed short at operator's… - [Accident 20121115024399A](https://openairdocs.org/incident/20121115024399A), Nov 15, 2012: Hughes 369D (N369AW), Corning, NY, Destroyed, 2 fatal. On 11-15-12, at 12:11 eastern standard time, two people were killed when a helicopter crashed near the chemung river close to kent phillips elementary school… - [Accident 20120427008199A](https://openairdocs.org/incident/20120427008199A), Apr 27, 2012: Bell 206B (N16EP), Elizabethtown, PA, Destroyed. During spray application maneuvering, the pilot (single occupant) became distracted with the electronic spray/navigation equipment and allowed the aircraft to… - [Accident 20120122000489A](https://openairdocs.org/incident/20120122000489A), Jan 22, 2012: Bell 206B (N555NB), Irving, TX, Substantial damage. The pilot took off in this aircraft from kdto (denton airport) with 75 gallons of fuel. He picked up three passengers at dal, landmark aviation. He took these… - [Incident 20110831020859I](https://openairdocs.org/incident/20110831020859I), Aug 31, 2011: Bell 206B (N56AL), Frost Proof, FL, Minor damage. While in flight, pilot experienced severe vibration, emergency descent and landing in an open field without injuries. Tail rotor gearbox was partially held on… - [Accident 20100724040409A](https://openairdocs.org/incident/20100724040409A), Jul 24, 2010: Bell 206 B II (N788BD), Big Bear City, CA, Substantial damage. Established out of ground effect hover. Tail rotor lost effectiveness. Aircraft made 3 clockwise rotations prior to impact with the ground - [Incident 20100614034619I](https://openairdocs.org/incident/20100614034619I), Jun 14, 2010: Hughes 369D (N500DC), Mt. Pleasant, TN, Minor damage. The pilot stated he was hovering for the lineman to make wire splices on a powerline. He had a slight quartering tailwind. The powerline had an oscillation as… - [Accident 20081030851419A](https://openairdocs.org/incident/20081030851419A), Oct 30, 2008: Hughes 369D (N606AS), Jackson, KY, Substantial damage. (-23) While trimming trees on a east to west heading along the allegheny power right of way located in Carroll township Pennsylvania, aircraft N606AS lost… - [Accident 20070905824179A](https://openairdocs.org/incident/20070905824179A), Sep 5, 2007: Bell 206B (N267MW), Lakeland, FL, Substantial damage. (-23) Pilot reported that just prior to touchdown, fifteen to twenty feet above the ground, the aircraft lost tail rotor effectiveness and spun around several… - [Incident 20061109025149I](https://openairdocs.org/incident/20061109025149I), Nov 9, 2006: Bell 206B (N198H), Oak Grove, LA. (-23) While repositioning from parking pad to takeoff area, engine failed. Performed hovering autorotation, no damage to aircraft. After blades stopped pilot… - [Incident 20060920020779I](https://openairdocs.org/incident/20060920020779I), Sep 20, 2006: Bell 206B (N39MK), Hamilton, TX. (-23) The pilot was picking up 4 heli-bags on a lanyard. One of the lanyards was about 6 feet longer than the others and the equipment dangled about an… - [Accident 20060608012339A](https://openairdocs.org/incident/20060608012339A), Jun 8, 2006: Hiller FH1100 (N4035G), Navarre Beach, FL, Minor damage. (-23) On June 8, 2006, at 1230 CDT, the pilot in command of N4035G, an FH-1100 helicopter departed from a private heliport at Navarre Beach Florida on a… - [Accident 20050923024399A](https://openairdocs.org/incident/20050923024399A), Sep 23, 2005: Bell 206B (N39MK), Titusville, FL, Substantial damage. (-23) See attached statements from personnel onboard. Planned maneuver was a 180-degree autorotation to a hover with planned touchdown from hover. Crew had… - [Incident 19990915033649I](https://openairdocs.org/incident/19990915033649I), Sep 15, 1999: Bell 206B (N444TV), Brooklyn Park, MN. (-23) On September 15, 1999, pilot al ludwig was approaching crystal airport setting up his landing phase of flight. Approximately four miles north of the… - [Incident 19950614022939I](https://openairdocs.org/incident/19950614022939I), Jun 14, 1995: Bell 206B (N444TV), Diamond Bluff, WI, Minor damage. Tv helicopter struck hidden wire trying to land at a crime scene. Aborted and landed elswhere. Damaged tail rotor. - [Incident 19941124043039I](https://openairdocs.org/incident/19941124043039I), Nov 24, 1994: Bell 206B (N454MS), Whitetop, VA, Minor damage. Lost tail rotor power during sling load ops. Hard landing bent skid support. One of 4 tr thomas coupling bolts lost - [Accident 19940828023729A](https://openairdocs.org/incident/19940828023729A), Aug 28, 1994: Hughes 369D (N5027P), Butler, PA, Substantial damage. Lost power. Autorotated. Low rotor RPM to reach open area. Hard landing. Main rotors chopped tailboom. Out of fuel. - [Accident 19931222047129A](https://openairdocs.org/incident/19931222047129A), Dec 22, 1993: Hughes 369D (N115HD), Waimea Kauai, HI, Substantial damage. Engine quit with load on long line. Released load. Autorotated. Collapsed fuel nozzle screen. Fuel contamination. - [Incident 19920625034679I](https://openairdocs.org/incident/19920625034679I), Jun 25, 1992: Bell 206B (N860DP), Sellersburg, IN, Minor damage. Helicopter made uncommanded yaw while maneuvering. No response to control input. Hit tree tops. Regained control. - [Accident 19850218003309A](https://openairdocs.org/incident/19850218003309A), Feb 18, 1985: Hiller FH1100 (N4035G), Steamboat Sprin, CO, Substantial damage. Large pilot alone in right seat. His weight caused helicopter to lean, leg blocked full cyclic movement. - [Accident 19840607024159A](https://openairdocs.org/incident/19840607024159A), Jun 7, 1984: Hughes 369D (N5106Y), Bedford, PA, Substantial damage. Ran out of fuel on a low level siesmic flight. Too low to maintain rotor speed. Hard landing collapsed a skid. - [Accident 19800916044479A](https://openairdocs.org/incident/19800916044479A), Sep 16, 1980: Bell 206BELL (N27758), Intracoastal Ci, LA, Substantial damage. Heard snap, bang in tail rotor area on hover. Landed safe. Found tail rotor assembly and blade damage, undetermined - [Accident 19790624040039A](https://openairdocs.org/incident/19790624040039A), Jun 24, 1979: Bell 206B (N16810), Gobernador, NM, Substantial damage. Forced landing due to engine failure. Cause of engine failure not determined. ## Service difficulty reports (1,981, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR 2026FA0000798](https://openairdocs.org/sdr/2026FA0000798), Sep 30, 2026: LOCK NUT. FAILED. MS21043 NUTS ARE UTILIZED TO SECURE TURBINE, COMPRESSOR, FUEL CONTROL, GOVERNOR, AND HAVE BEEN FOUND NUMEROUS TIMES TO HAVE NOT MAINTAINED THE MANUAL SPECIFIED - [SDR 2024FA0000959](https://openairdocs.org/sdr/2024FA0000959), Dec 12, 2024: ENGINE. MAKING METAL. PILOT EXPERIENCED AN ENGINE CHIP LIGHT DURING LANDING. ENGINE REMOVED FROM AIRCRAFT FOR FURTHER INVESTIGATION. - [SDR 2024FA0000958](https://openairdocs.org/sdr/2024FA0000958), Dec 11, 2024: ENGINE. MAKING METAL. PILOT EXPERIENCED AN ENGINE CHIP INDICATION DURING APPROACH. MAINTENANCE PERFORMED CLEANING AND GROUND RUNS AND RETURNED TO SERVICE. - [SDR 2024FA0000554](https://openairdocs.org/sdr/2024FA0000554), Jul 28, 2024: CLUTCH. MAKING METAL. DURING A SCHEDULED 100 HOUR MAINTENANCE INSPECTION ON THE AIRCRAFT. THE MECHANIC QUESTIONED THE DARK BURNT APPEARANCE OF THE GREASE IN THE • BEARING, OVERRUNNIN - [SDR 2024FA0000495](https://openairdocs.org/sdr/2024FA0000495), Jul 9, 2024: CLUTCH. MAKING METAL. DURING AIRCRAFT INSPECTION AN AIRCRAFT MECHANIC QUESTIONED DISCOLORING OF THE OVERRUNNING CLUTCH OUTPUT BEARING GREASE. THE BEARING DID NOT DEMONSTRATE ANY ABNO - [SDR 2024FA0000203](https://openairdocs.org/sdr/2024FA0000203), Mar 6, 2024: ENGINE. MAKING METAL. PILOT REPORTED AN ENGINE CHIP LIGHT ILLUMINATION AND PERFORMED AN UNSCEDULED LANDING. A MECHANIC WAS SENT TO THE AIRCRAFT AND DISCOVERED METAL ON THE UPPER ENGI - [SDR 3M3A202401060001](https://openairdocs.org/sdr/3M3A202401060001), Jan 1, 2024: UNKNOWN. UNKNOWN. ON JANUARY 1ST 2024, N514PA EXPERIENCED AN ENGINE CHIP LIGHT DURING A 135 TOUR FLIGHT. THE PILOT MADE A PRECAUTIONARY LANDING. ALL PASSENGERS WERE REMOVED WITH - [SDR 2023FA0000497](https://openairdocs.org/sdr/2023FA0000497), Aug 28, 2023: ENGINE. ABNORMAL. UDRING STRAIGHT AND LEVEL FLIGHT THE PILOT REPORTED LOW ENGINE TORQUE. THE PILOT SELECTED A LANDING SPOT AND PERFORMED AN UNEVENTFUL PRECAUTIONARY LANDING. THE - [SDR 2023FA0000285](https://openairdocs.org/sdr/2023FA0000285), May 30, 2023: CONNECTOR. LOOSE. DURING FLIGHT THE PILOT NOTICED THE FUEL QUANTITY GAUGE DROPPED TO ZERO THEN THE ENGINE OIL TEMP WENT TO ZERO. THE INSTRUMENT CIRCUIT BREAKER THEN POPPED. THE P - [SDR 2022FA0000760](https://openairdocs.org/sdr/2022FA0000760), Dec 14, 2022: ENGINE. MAKING METAL. ENGINE GEARBOX CHIP LIGHT ILLUMINATED DURING APPROACH FOR LANDING. UPON INSPECTION IT WAS DETERMINED THAT THE UPPER GEARBOX MAGNETIC CHIP DETECTOR HAD ILLUMINAT - [SDR 2022FA0000677](https://openairdocs.org/sdr/2022FA0000677), Nov 8, 2022: ENGINE. MAKING METAL. PILOT GOT AN ENGINE CHIP LIGHT DURING FLIGHT AND PERFORMED A PRECAUTIONARY LANDING. MAINTENANCE FOUND EVIDENCE OF CHIPS ON THE LOWER AND UPPER ENGINE GEARBOX CH - [SDR 2022FA0000286](https://openairdocs.org/sdr/2022FA0000286), Jun 10, 2022: HUB. CRACKED. A CRACK WAS FOUND ON THE OUTSIDE OF M/R HUB ORIGINATING FROM INBOARD TT PIN HOLE. THE CRACK EXTENDS FROM THE INSIDE DIAMETER OF THE BORE TO THE OUTSIDE OF THE H - [SDR K2DA0182E](https://openairdocs.org/sdr/K2DA0182E), Nov 3, 2021: COMPRESSOR. NONE. AIRCRAFT N508PH, A MD500E, WAS CONDUCTING A UTILITY FLIGHTS UNDER AN OAS CONTRACT AND PERFORMED A PRECAUTIONARY LANDING AT 21°35’ 10.9” N, 158° 00’ 44.7” W DUE - [SDR 2021FA0000137](https://openairdocs.org/sdr/2021FA0000137), May 13, 2021: TURBINE WHEEL. BINDING. DURING MAINTENANCE THE MECHANICS DETERMINED THE FIRST STAGE TURBINE BLADES WERE RUBBING ON THE NOZZLE.ASSEMBLY REMOVED FROM ENGINE - [SDR 2021FA0000047](https://openairdocs.org/sdr/2021FA0000047), Feb 16, 2021: FUEL CONTROL. FAILED. FIRST FUEL CONTROL UNABLE TO ADJUST START , SECOND FUEL CONTROL WAS UNABLE TO START AT ALL, REPLACED FUEL CONTROL DISCREPANCY WAS FIXED. THIS WAS ALL IN A YEARS - [SDR 2021FA0000078](https://openairdocs.org/sdr/2021FA0000078), Feb 16, 2021: FUEL CONTROL. FAILED. AIRCRAFT ENGINE WOULD NOT START. FUEL CONTROL REMOVED AND REPLACED DISCREPANCY CORRECTED. THIS IS THE FINDINGS OF THE REPAIR STATION THE FUEL CONTROL WAS SENT T - [SDR 2019FA0000338](https://openairdocs.org/sdr/2019FA0000338), Oct 14, 2019: FUEL CONTROL. LEAKING. DURING MAINTENANCE GROUND RUN CHECK OPERATIONS ENGINE FUEL WAS NOTICED COMING OUT OF THE FUEL CONTROL CASE AND LEAKING TO THE GROUND. FUEL CONTROL WAS REMOVED F - [SDR 2019FA0000298](https://openairdocs.org/sdr/2019FA0000298), Sep 6, 2019: COUPLING. BROKEN. FAILURE OF THE AFT COUPLING. FRACTURE OF COUPLING. SEE ENGINEERED PRODUCTS 8130-3 WORK ORDER # MDI1167 DATED MARCH 20, 2018 FOR PART DETAIL. - [SDR CA190716006](https://openairdocs.org/sdr/CA190716006), Jul 10, 2019: GOVERNOR. FAULTY. (CAN) AIRCRAFT WAS IN FLIGHT AND PILOT NOTICED A DROP IN ENGINE RPM FROM 100% TO 90%. STARTED DECENT ON A BUSH ROAD. GOVERNOR WAS REPLACED WITH A SERVICEABLE UN - [SDR DCGA2019FA0000153](https://openairdocs.org/sdr/DCGA2019FA0000153), May 15, 2019: ENGINE. MAKING METAL. ENGINE CHIP LIGHT DURING FLIGHT. MAINTENANCE FOUND 4 FLAKES ON UPPER AND LOWER PLUGS WITHIN PARAMETERS. PERFORMED AN OIL SYSTEM DRAIN, FLUSH AND FILTER CLEAN AN - [SDR BHHR20190607001](https://openairdocs.org/sdr/BHHR20190607001), Apr 18, 2019: HOUSING. CRACKED. A CRACK WAS FOUND IN TRANSMISSION LOWER HOUSING JUST BELOW THE CYCLIC BELLCRANK BRACKET P/N 33031 MOUNTING FACE. THE CRACK WAS LOCATED IN THE AFT LOWER MOUNTING - [SDR K2DA2019052800001](https://openairdocs.org/sdr/K2DA2019052800001), Apr 17, 2019: BLEED VALVE. STUCK. PILOT PERFORMED ENGINE POWER ASSURANCE CHECK AT 80% TQ AND 2,000 FT AGL AND REPORTED A +1* ON THE POWER CHECK WHICH WAS A SIGNIFICANT DIFFERENCE IN THE POWER CH - [SDR CA190326009](https://openairdocs.org/sdr/CA190326009), Mar 26, 2019: COMPRESSOR. FOD. (CAN) THE RENTAL ENGINE RAN HOT FROM THE FIRST DAY I FLEW IT. THE STARTS WHERE VERY SLOW BUT STILL IN PARAMETERS. THE TOT WAS APPROX. 580 DEGREES AT GROUND IDLE - [SDR K2DA2019052800003](https://openairdocs.org/sdr/K2DA2019052800003), Mar 19, 2019: BLEED VALVE. STICKS. DURING AN ROUTINE INSPECTION IT WAS DISCOVERED THAT THE ENGINE BLEED VALVE WAS STICKING. BLEED VALVE HAD 317.2 TSO. - [SDR 2019FA0000075](https://openairdocs.org/sdr/2019FA0000075), Mar 18, 2019: BLADE. CRACKED. THE BOTTOM SKIN OF THE MAIN ROTOR BLADE HAS A 4 1/2 INCH CRACK STATING AT THE TRAILING EDGE AND PERPENDICULAR TO SPAN 57 1/4 INCHES IN FOR BLADE TIP. - [SDR CA190507012](https://openairdocs.org/sdr/CA190507012), Mar 18, 2019: STATOR. BROKEN. (CAN) UPON ROUTINE INSPECTION OF COMPRESSOR CASE HALFS (WHILE ENGINE WAS REMOVED FROM AIRFRAME) IT WAS FOUND THAT ONE OF THE 6TH STAGE STATOR BLADES HAD BROKEN - [SDR 2020FA0000049](https://openairdocs.org/sdr/2020FA0000049), Mar 12, 2019: ROTOR. CRACKED. A CRACK INDICATION WAS INDICATED 7/16 INCHES LONG, 10 INCHES FROM UPPER END OF MAST. CRACK WAS FOUND WITH FLORESCENT MAGNETIC PARTICLE. INSPECTION WAS DONE PER - [SDR K2DA2019052800002](https://openairdocs.org/sdr/K2DA2019052800002), Feb 17, 2019: BLEED VALVE. STUCK. PILOT WAS RUNNING ENGINE ON THE GROUND AND THE COMPRESSOR STARTED STALLING. MAINTENANCE PERSONNEL DISCOVERED THE ENGINE BLEED VALVE WAS STUCK IN THE CLOSED POSI - [SDR J5XA2019FA0000031](https://openairdocs.org/sdr/J5XA2019FA0000031), Feb 5, 2019: CHIP DETECTOR. CONTAMINATED. PILOT REPORTED AN ENGINE CHIP LIGHT DURING APPROACH TO LANDING. MAINTENANCE FOUND ACCEPTABLE CHIPS ON UPPER AND LOWER PLUGS. THE PLUGS WERE CLEANED AND REINSTAL - [SDR LSSA2018F00000](https://openairdocs.org/sdr/LSSA2018F00000), Sep 20, 2018: DRIVE BEARING. FAILED. THE AIRCRAFT SUFFERED AN INFLIGHT ENGINE OVERSPEED AND SUBSEQUENT ENGINE FAILURE. THE PILOT PERFORMED A SUCCESSFUL AUTOROTATION TO THE GROUND WITH NO DAMAGE TO - [SDR CA190110019](https://openairdocs.org/sdr/CA190110019), Sep 19, 2018: SAFETY VALVE. FAILED. (CAN) IT WAS REPORTED TO BELL: ENROUTE WITH A PASSENGER AND SUSTAINED A SUDDEN POWER LOSS. PILOT AUTOROTATED TO AN OPEN FIELD AND THE LANDING GEAR WAS DAMAGED D - [SDR MKHR2018091300000](https://openairdocs.org/sdr/MKHR2018091300000), Aug 8, 2018: BOLT. SHEARED. DURING CRUISE FLIGHT THE PILOT EXPERIENCED AN EXCESSIVE TAIL ROTOR VIBRATION. THE PILOT THEN EXECUTED A PRECAUTIONARY LANDING. WHEN CREW ARRIVED TO INVESTIGATE - [SDR CA180723016](https://openairdocs.org/sdr/CA180723016), Jul 19, 2018: MONITOR. CRACKED. (CAN) DURING SCHEDULED MAINTENANCE, THE TRANSMISSION OIL MONITOR HOUSING WAS REMOVED TO INSPECT THE SCREEN FOR CONTAMINATION. UPON REMOVAL OF THE O-RING FROM TH - [SDR DCGA2018071200221](https://openairdocs.org/sdr/DCGA2018071200221), Jul 12, 2018: CHIP DETECTOR. CONTAMINATED. PILOT REPORTED AND ENGINE CHIP LIGHT AND PERFORMED AN UNSCHEDULED LANDING. MAINTENANCE FOUND 1 SLIVER ON THE UPPER GEARBOX CHIP PLUG. THE PLUG WAS CLEANED AND A - [SDR DCGA201801230044](https://openairdocs.org/sdr/DCGA201801230044), Jan 23, 2018: ENGINE. MAKING METAL. DURING CRUISE FLIGHT AND ENGINE CHIP LIGHT INDICATION OCCURRED. THE PILOT PERFORMED A PRECAUTIONARY LANDING. MAINTENANCE DISCOVERED METAL FLAKES ON UPPER AND LO - [SDR CA180117008](https://openairdocs.org/sdr/CA180117008), Jan 8, 2018: DRIVE SHAFT. WORN. (CAN) NOTED A KNOCKING NOISE NEAR TAIL ROTOR GEARBOX AFTER AIRCRAFT LANDED FOR MAINTENANCE. FOUND EXCESSIVE PLAY BETWEEN AFT TAIL ROTOR DRIVESHAFT SEGMENT AND H - [SDR HDNA2018F00066](https://openairdocs.org/sdr/HDNA2018F00066), Jan 3, 2018: ENGINE. MAKING METAL. ENGINE CHIP INDICATION. PILOT FOLLOWED EMERGENCY PROCEDURE AND SHUT ENGINE DOWN AND PERFORMED RUN-ON LANDING. UPON INSPECTION OF CHIP DETECTOR FOUND CATEGORY 1 - [SDR BHHR201710030001](https://openairdocs.org/sdr/BHHR201710030001), Oct 3, 2017: DRIVE GEAR. SPALLED. A TEAR-DOWN INSPECTION OF A 250-C20B ENGINE GEARBOX WAS PERFORMED. THIS GEARBOX WAS REMOVED FROM SERVICE DUE TO CHIP LIGHTS AND AN AUDIBLE WHINE HEARD OVER THE - [SDR BHHR201710030002](https://openairdocs.org/sdr/BHHR201710030002), Oct 3, 2017: GEAR. SPALLED. ENGINE WAS REMOVED FROM SERVICE DUE TO CHIP LIGHTS AND AN AUDIBLE WHINE HEARD OVER THE RUNNING AIRCRAFT. THIS GEARBOX WAS ASSEMBLED IN-HOUSE AFTER A 3500 HOUR O - [SDR 2017F00107](https://openairdocs.org/sdr/2017F00107), Jul 17, 2017: BEARING. FAILED. ENGINE CHIP LIGHT CAME ON, TURBINE WAS INSPECTED AND THE NR 5 BEARING WAS FOUND TO BE THE CAUSE OF METAL GENERATION. - [SDR 2017FA0000000](https://openairdocs.org/sdr/2017FA0000000), Jan 3, 2017: COMPRESSOR. DAMAGED. PILOT REPORTED TURBINE OUTLET TEMPERATURE INCREASE AT END OF FLIGHT. MAINTENANCE DISCOVERED COMPRESSOR BLADES DAMAGED BY UNKNOWN FOD. - [SDR 2016FA0000632](https://openairdocs.org/sdr/2016FA0000632), Dec 13, 2016: DRIVE ASSY. CRACKED. DRIVE BODY WAS FOUND CRACKED DURING OVERHAUL. - [SDR 2016FA0000537](https://openairdocs.org/sdr/2016FA0000537), Oct 24, 2016: FUEL CONTROL. LEAKING. DURING A POST FLIGHT INSPECTION MAINTENANCE FOUND A SMALL FUEL LEAK AT THE OUT FITTING LOCATION ON THE ENGINE FUEL CONTROL UNIT. THE UNIT WAS REPLACED WITH A SE - [SDR QMLA2016071816076](https://openairdocs.org/sdr/QMLA2016071816076), Jul 18, 2016: WARNING SYSTEM. FALSE ACTIVATION. AFTER TAKEOFF, THE PILOT SAW A TRANSMISSION CHIP LIGHT ILLUMINATE. HE IMMEDIATELY RETURNED TO BASE AND CALLED THE MECHANIC ON DUTY. THE MECHANIC ARRIVED TO TROU - [SDR DCGA2016071800332](https://openairdocs.org/sdr/DCGA2016071800332), Jul 16, 2016: BLADE. DELAMINATED. FOUND DELAMINATION ON MAIN ROTOR BLADE STAINLESS STEEL LEADING EDGE. - [SDR K2DA20160707146](https://openairdocs.org/sdr/K2DA20160707146), Jul 4, 2016: BEARING. SPALLED. AIRCRAFT PERFORMED A PRECAUTIONARY LANDING FOR AN ENGINE CHIP LIGHT WHILE CONDUCTING AN AIR TOUR. THERE WERE NO SECONDARY INDICATIONS AND THE AIRCRAFT LANDED SA - [SDR K2D2016F00002](https://openairdocs.org/sdr/K2D2016F00002), Jun 14, 2016: BEARING. DAMAGED. THE COMPRESSOR WAS REMOVED FROM THE ENGINE GEARBOX AND IT WAS DISCOVERED THAT THE COMPRESSOR SPUR ADAPTER GEARSHAFT JOURNAL HAD A WORN AREA WHERE METAL WAS REMO - [SDR 2016FA0000284](https://openairdocs.org/sdr/2016FA0000284), Jun 8, 2016: BEARING. SPALLED. THE ENGINE WAS REMOVED FOR CHIPS IN THE OIL. THE SOURCE WAS FOUND TO BE THE NR 5 BEARING, PN M250-10106, SN NWL13-0863. - [SDR HDNA201604270001](https://openairdocs.org/sdr/HDNA201604270001), Apr 27, 2016: COMPRESSOR. MAKING METAL. WHILE ON BASE FINAL FOR TAXIWAY, THE NR 1 ENG OIL PRESS STARTED FLUCTUATING WITH OIL TEMPERATURE NORMAL & TORQUES MATCHED. AT SHORT FINAL THE ENG CHIP CAUTION L - [SDR 8MHR201604110001](https://openairdocs.org/sdr/8MHR201604110001), Apr 9, 2016: TURBINE WHEEL. FRACTURED. FOUND A PIECE OF THE FOURTH STAGE TURBINE WHEEL BLADE AND SHROUD MISSING. All 1,981: https://openairdocs.org/engine/allison-250-c20b/reports.md ## STCs that may be installed (OpenAirDocs) (7) 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 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 - [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 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.