# Allison 250-C28 series - Type: Engine model (FAA registry) - Registry codes: 03022, 03021 - Manufacturer (registry): ALLISON - Model: 250-C28 SER - Engine type: Turbo-shaft - Power: 500 hp - Data sheet: [TCDS E1GL](https://openairdocs.org/tcds/E1GL) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 43 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c28-series The registry names only the engine series, so ADs for every model in the series are matched. The FAA lists this model under more than one registry code, usually for different spellings of the maker. This page covers them all. ## ADs that may apply (OpenAirDocs) Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 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 2005-20-11](https://openairdocs.org/ad/2005-20-11): Airfoils at the hub and shroud of third-stage turbine wheels · Rolls-Royce 250-C28, 250-C28B and 250-C28C. Effective Oct 18, 2005 - [AD 2004-14-02](https://openairdocs.org/ad/2004-14-02): SN third-stage turbine wheels · Rolls-Royce 250-C28, 250-C28B and 250-C28C. Effective Jul 26, 2004 - [AD 2002-06-08](https://openairdocs.org/ad/2002-06-08): Third Stage Turbine Wheels · Rolls-Royce 250-C28, 250-C28B and 250-C28C. Effective Apr 26, 2002 - [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 89-23-12](https://openairdocs.org/ad/89-23-12): Turbine Nozzle Assembly · Rolls-Royce 250-C28B and 250-C28C. Effective Oct 29, 1989 - [AD 86-20-13](https://openairdocs.org/ad/86-20-13): External Splines · Rolls-Royce 250-C28B, 250-C28C, 250-C30 and 9 more. Effective Dec 3, 1986 - [AD 85-25-07 R1](https://openairdocs.org/ad/85-25-07-R1): Outer Combustion Case Assembly · Rolls-Royce 250-C28, 250-C28B, 250-C28C and 10 more. Effective Aug 15, 1986 - [AD 86-16-03](https://openairdocs.org/ad/86-16-03): Scavenge Line Air/Oil Centrifugal Separator Assembly · Rolls-Royce 250-C28B and 250-C28C. Effective Aug 13, 1986 - [AD 85-25-12](https://openairdocs.org/ad/85-25-12): Turbine-To-Compressor-Coupling · Rolls-Royce 250-C28B and 250-C28C. Effective Jan 6, 1986 - [AD 85-25-09](https://openairdocs.org/ad/85-25-09): Turbine Shafts And Couplings · Rolls-Royce 250-C28B and 250-C28C. Effective Jan 6, 1986 - [AD 85-25-08](https://openairdocs.org/ad/85-25-08): Compressor Mount Assembly · Rolls-Royce 250-C28B, 250-C28C, 250-C30 and 2 more. Effective Jan 6, 1986 - [AD 83-01-04](https://openairdocs.org/ad/83-01-04): Turbine Assemblies · Rolls-Royce 250-C28B and 250-C28C. Effective Jan 24, 1983 - [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 82-03-02](https://openairdocs.org/ad/82-03-02): N2 (Electronic) Overspeed Control System · Rolls-Royce 250-C28B. Effective Feb 4, 1982 - [AD 79-16-06](https://openairdocs.org/ad/79-16-06): Accessory Drive Gearbox · Rolls-Royce 250-C28, 250-C28B, 250-C28C and 10 more. Effective Jan 11, 1980 - [AD 79-18-13](https://openairdocs.org/ad/79-18-13): Third Stage Turbine Wheel · Rolls-Royce 250-C28B and 250-C28C. Effective Sep 6, 1979 - [AD 79-06-05](https://openairdocs.org/ad/79-06-05): Overspeed Control System · Rolls-Royce 250-C28B and 250-C30. Effective Mar 26, 1979 - [AD 78-26-01](https://openairdocs.org/ad/78-26-01): Engine Electrical System · Rolls-Royce 250-C28B. Effective Nov 3, 1978 Historical (superseded or no longer in force): - [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 ## Registered aircraft (43) - [N105SD](https://openairdocs.org/aircraft/N105SD): [Heli Flite Inc](https://openairdocs.org/faa-owner/HELI%20FLITE%20INC), [Corona, CA](https://openairdocs.org/faa-place/CA/Corona), built 1998, S/N 2052 - [N106AE](https://openairdocs.org/aircraft/N106AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1981, S/N 45566 - [N1085T](https://openairdocs.org/aircraft/N1085T): [Aspen Helicopters Inc](https://openairdocs.org/faa-owner/ASPEN%20HELICOPTERS%20INC), [Oxnard, CA](https://openairdocs.org/faa-place/CA/Oxnard), built 1980, S/N 45376 - [N110LT](https://openairdocs.org/aircraft/N110LT): [Lt Aviation LLC](https://openairdocs.org/faa-owner/LT%20AVIATION%20LLC), [Louisa, KY](https://openairdocs.org/faa-place/KY/Louisa), built 1981, S/N 45676 - [N12AE](https://openairdocs.org/aircraft/N12AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1981, S/N 45649 - [N134AE](https://openairdocs.org/aircraft/N134AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1981, S/N 45593 - [N138AE](https://openairdocs.org/aircraft/N138AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1983, S/N 45782 - [N144TV](https://openairdocs.org/aircraft/N144TV): [Air Flite Inc](https://openairdocs.org/faa-owner/AIR%20FLITE%20INC), [Shawnee, OK](https://openairdocs.org/faa-place/OK/Shawnee), built 1982, S/N 45602 - [N176AE](https://openairdocs.org/aircraft/N176AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [Ofallon, MO](https://openairdocs.org/faa-place/MO/Ofallon), built 1979, S/N 45224 - [N2009C](https://openairdocs.org/aircraft/N2009C): [Meridian Helicopters LLC](https://openairdocs.org/faa-owner/MERIDIAN%20HELICOPTERS%20LLC), [Broussard, LA](https://openairdocs.org/faa-place/LA/Broussard), built 1982, S/N 45678 - [N206SL](https://openairdocs.org/aircraft/N206SL): [Av8-Orr Helicopter Services Inc](https://openairdocs.org/faa-owner/AV8-ORR%20HELICOPTER%20SERVICES%20INC), [Hamilton, MT](https://openairdocs.org/faa-place/MT/Hamilton), built 1979, S/N 45245 - [N233BB](https://openairdocs.org/aircraft/N233BB): [Top Gun Precision Ag LLC](https://openairdocs.org/faa-owner/TOP%20GUN%20PRECISION%20AG%20LLC), [Skidmore, TX](https://openairdocs.org/faa-place/TX/Skidmore), built 1980, S/N 45489 - [N2611](https://openairdocs.org/aircraft/N2611): [Jbi South Leasing LLC](https://openairdocs.org/faa-owner/JBI%20SOUTH%20LEASING%20LLC), [Pembroke, NH](https://openairdocs.org/faa-place/NH/Pembroke), built 1980, S/N 45417 - [N274AE](https://openairdocs.org/aircraft/N274AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1983, S/N 45762 - [N292AE](https://openairdocs.org/aircraft/N292AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1983, S/N 45780 - [N315AE](https://openairdocs.org/aircraft/N315AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1980, S/N 45482 - [N315MH](https://openairdocs.org/aircraft/N315MH): [Cane Helicopter Services LLC](https://openairdocs.org/faa-owner/CANE%20HELICOPTER%20SERVICES%20LLC), [Franklin, LA](https://openairdocs.org/faa-place/LA/Franklin), built 1981, S/N 45692 - [N3173H](https://openairdocs.org/aircraft/N3173H): [Alabama Law Enforcement Agency](https://openairdocs.org/faa-owner/ALABAMA%20LAW%20ENFORCEMENT%20AGENCY), [Montgomery, AL](https://openairdocs.org/faa-place/AL/Montgomery), built 1982, S/N 45714 - [N3176L](https://openairdocs.org/aircraft/N3176L): [Riggs Bobby W](https://openairdocs.org/faa-owner/RIGGS%20BOBBY%20W), [Lake Mary, FL](https://openairdocs.org/faa-place/FL/Lake%20Mary), built 1983, S/N 45648 - [N3188P](https://openairdocs.org/aircraft/N3188P): [Marks Aviation Group LLC](https://openairdocs.org/faa-owner/MARKS%20AVIATION%20GROUP%20LLC), [Lafayette, LA](https://openairdocs.org/faa-place/LA/Lafayette), built 1983, S/N 45778 - [N3190P](https://openairdocs.org/aircraft/N3190P): [Veturis David](https://openairdocs.org/faa-owner/VETURIS%20DAVID), [Lake Forest, CA](https://openairdocs.org/faa-place/CA/Lake%20Forest), built 1983, S/N 45779 - [N388JC](https://openairdocs.org/aircraft/N388JC): [Sweetwater Landing LLC](https://openairdocs.org/faa-owner/SWEETWATER%20LANDING%20LLC), [Helena, MT](https://openairdocs.org/faa-place/MT/Helena), built 1981, S/N 45568 - [N3895D](https://openairdocs.org/aircraft/N3895D): [Monarch Enterprises Inc](https://openairdocs.org/faa-owner/MONARCH%20ENTERPRISES%20INC), [Kirkland, WA](https://openairdocs.org/faa-place/WA/Kirkland), built 1980, S/N 45590 - [N38TH](https://openairdocs.org/aircraft/N38TH): [Global Aerials Inc](https://openairdocs.org/faa-owner/GLOBAL%20AERIALS%20INC), [Pembroke Pines, FL](https://openairdocs.org/faa-place/FL/Pembroke%20Pines), S/N 45653 - [N397RL](https://openairdocs.org/aircraft/N397RL): [Bank Of Utah Trustee](https://openairdocs.org/faa-owner/BANK%20OF%20UTAH%20TRUSTEE), [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City), built 1980, S/N 45397 - [N477CS](https://openairdocs.org/aircraft/N477CS): [Spearfish, SD](https://openairdocs.org/faa-place/SD/Spearfish), built 1994, S/N 2045, Registration pending - [N478CS](https://openairdocs.org/aircraft/N478CS): [Spearfish, SD](https://openairdocs.org/faa-place/SD/Spearfish), built 1998, S/N 2053, Registration pending - [N5017G](https://openairdocs.org/aircraft/N5017G): [Helimontana.Com LLC](https://openairdocs.org/faa-owner/HELIMONTANA.COM%20LLC), [Livingston, MT](https://openairdocs.org/faa-place/MT/Livingston), built 1979, S/N 45228 - [N516LE](https://openairdocs.org/aircraft/N516LE): [Rotor Republic LLC](https://openairdocs.org/faa-owner/ROTOR%20REPUBLIC%20LLC), [Orlando, FL](https://openairdocs.org/faa-place/FL/Orlando), built 1978, S/N 45162 - [N54BL](https://openairdocs.org/aircraft/N54BL): [Daumeries Baudouin](https://openairdocs.org/faa-owner/DAUMERIES%20BAUDOUIN), [Pagosa Springs, CO](https://openairdocs.org/faa-place/CO/Pagosa%20Springs), S/N 233 - [N54NY](https://openairdocs.org/aircraft/N54NY): [Wisk Aero LLC](https://openairdocs.org/faa-owner/WISK%20AERO%20LLC), [Mountain View, CA](https://openairdocs.org/faa-place/CA/Mountain%20View), built 1983, S/N 45770 - [N571CJ](https://openairdocs.org/aircraft/N571CJ): [Rotorpro LLC](https://openairdocs.org/faa-owner/ROTORPRO%20LLC), [Sevierville, TN](https://openairdocs.org/faa-place/TN/Sevierville), built 1983, S/N 45781 - [N6651H](https://openairdocs.org/aircraft/N6651H): [R & R Conner Aviation LLC](https://openairdocs.org/faa-owner/R%20%26%20R%20CONNER%20AVIATION%20LLC), [Conner, MT](https://openairdocs.org/faa-place/MT/Conner), built 1979, S/N 45211 - [N66RR](https://openairdocs.org/aircraft/N66RR): [Riggs Rock Alan](https://openairdocs.org/faa-owner/RIGGS%20ROCK%20ALAN), [Lake Mary, FL](https://openairdocs.org/faa-place/FL/Lake%20Mary), built 1979, S/N 45278 - [N720B](https://openairdocs.org/aircraft/N720B): [Gentem Inc Trustee](https://openairdocs.org/faa-owner/GENTEM%20INC%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1980, S/N 45452 - [N749FF](https://openairdocs.org/aircraft/N749FF): [Hunt-Lo Farms LLC](https://openairdocs.org/faa-owner/HUNT-LO%20FARMS%20LLC), [Chesterland, OH](https://openairdocs.org/faa-place/OH/Chesterland), built 1983, S/N 45773 - [N777EM](https://openairdocs.org/aircraft/N777EM): [Alaskan Wings LLC](https://openairdocs.org/faa-owner/ALASKAN%20WINGS%20LLC), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 1983, S/N 45767 - [N787RC](https://openairdocs.org/aircraft/N787RC): built 1987, S/N 2012 - [N8118Y](https://openairdocs.org/aircraft/N8118Y): [Sanborn Richard E Trustee](https://openairdocs.org/faa-owner/SANBORN%20RICHARD%20E%20TRUSTEE), [Bethlehem, NH](https://openairdocs.org/faa-place/NH/Bethlehem), S/N 2017 - [N902EH](https://openairdocs.org/aircraft/N902EH): [North Wind Aviation LLC](https://openairdocs.org/faa-owner/NORTH%20WIND%20AVIATION%20LLC), [Chelan, WA](https://openairdocs.org/faa-place/WA/Chelan), S/N 45769 - [N96AE](https://openairdocs.org/aircraft/N96AE): [Air Evac Ems Inc](https://openairdocs.org/faa-owner/AIR%20EVAC%20EMS%20INC), [O Fallon, MO](https://openairdocs.org/faa-place/MO/O%20Fallon), built 1982, S/N 45751 - [N979N](https://openairdocs.org/aircraft/N979N): [Fresh Air LLC](https://openairdocs.org/faa-owner/FRESH%20AIR%20LLC), [Camarillo, CA](https://openairdocs.org/faa-place/CA/Camarillo), built 1983, S/N 45777 - [N9993C](https://openairdocs.org/aircraft/N9993C): [Templar Helicopters LLC](https://openairdocs.org/faa-owner/TEMPLAR%20HELICOPTERS%20LLC), [Glendale, AZ](https://openairdocs.org/faa-place/AZ/Glendale), S/N 45682 ## NTSB investigations (34) 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 WPR26LA146](https://openairdocs.org/ntsb/WPR26LA146), Apr 4, 2026: Bell Helicopter Textron 206L-1 (N5017G), Chimney Rock, MT, substantial damage. Probable cause: The pilot’s failure to maintain adequate clearance from the terrain while performing a low altitude circling takeoff maneuver, which resulted in a dynamic rollover. - [NTSB CEN25FA281](https://openairdocs.org/ntsb/CEN25FA281), Jul 23, 2025: Bell Helicopter Textron 206L-1 (N2611), Thibodaux, LA, destroyed, 1 fatal. Probable cause: The pilot’s failure to maintain clearance to powerlines during an agricultural application pass. - [NTSB ERA24LA076](https://openairdocs.org/ntsb/ERA24LA076), Dec 28, 2023: Bell Helicopter Textron 206L-1 (N571CJ), Walland, TN, substantial damage. Probable cause: The improper installation of the No. 8 bearing spanner nut, which resulted in the No. 8 bearing’s failure, and the subsequent total loss of engine power. - [NTSB ERA15LA138](https://openairdocs.org/ntsb/ERA15LA138), Feb 15, 2015: Bell 206 (N3176L), Sevierville, TN, substantial damage. Probable cause: An uncontained engine failure, which resulted from insufficient lubrication of the No. 4 bearing due to carbon buildup on the filter screen of the bearing's oil supply nozzle. - [NTSB ERA13FA273](https://openairdocs.org/ntsb/ERA13FA273), Jun 7, 2013: Bell Helicopter Textron 206L-1 (N114AE), Manchester, KY, destroyed, 3 fatal. Probable cause: The pilot’s loss of helicopter control due to spatial disorientation when he inadvertently encountered night, instrument meteorological conditions, which resulted in the in-flight separation of the… - [NTSB CEN09LA413](https://openairdocs.org/ntsb/CEN09LA413), Jul 2, 2009: Bell Helicopter Textron 206L-1 (N38AZ), Breckenridge, CO, substantial damage. Probable cause: The pilot's failure to maintain directional control while maneuvering due to a loss of tail rotor effectiveness. Contributing to the accident was the pilot's failure to monitor wind direction while… - [NTSB CEN09FA012](https://openairdocs.org/ntsb/CEN09FA012), Oct 13, 2008: Bell 206 (N6ZV), Conroe, TX, destroyed, 2 fatal. Probable cause: A loss of control for undetermined reasons. - [NTSB DFW08FA053](https://openairdocs.org/ntsb/DFW08FA053), Dec 29, 2007: Bell 206L1 (N211EL), Venice, LA, destroyed, 1 fatal. Probable cause: The pilot’s decision to continue to the destination landing platform in weather conditions below the company’s weather minimums and his failure to maintain aircraft control during the approach.… - [NTSB CHI06FA110](https://openairdocs.org/ntsb/CHI06FA110), Apr 13, 2006: Messerschmitt-Bolkow-Blohm BO 105LS A-3 (N202LF), Green Bay, WI, substantial damage, 1 fatal. Probable cause: The pilot's inadequate preflight check of the flight controls prior to takeoff and the directional contol not possible by the pilot. Additional causes were the improper installation of the… - [NTSB LAX05LA155](https://openairdocs.org/ntsb/LAX05LA155), May 2, 2005: Bell 206L-1 (N3895D), Peach Springs, AZ, substantial damage. Probable cause: a loss of power for undetermined reasons. - [NTSB ATL05CA077](https://openairdocs.org/ntsb/ATL05CA077), Apr 30, 2005: Bell 206L 1 (N66RR), Cherokee, NC, substantial damage. Probable cause: The pilot's improper use of the helicopter flight controls during a hover that resulted in a dynamic rollover. - [NTSB DFW05CA088](https://openairdocs.org/ntsb/DFW05CA088), Mar 13, 2005: Bell B-206L-1 (N480RA), Galliano, LA, destroyed. Probable cause: The pilot's abrupt input of the collective while the main rotor RPM was at idle, which resulted in a separation of the tail boom. - [NTSB LAX04FA076](https://openairdocs.org/ntsb/LAX04FA076), Dec 24, 2003: Agusta A109A (N25RX), Redwood Valley, CA, destroyed, 3 fatal. Probable cause: The pilot's improper in-flight planning and decision to continue flight under visual flight rules into deteriorating weather conditions, which resulted in an inadvertent in-flight encounter with… - [NTSB CHI03LA319](https://openairdocs.org/ntsb/CHI03LA319), Sep 21, 2003: Bell 206L-1 (N74AE), Shoals, IN, substantial damage. Probable cause: The pilot not maintaining a proper descent rate during the touchdown once visual reference was reduced by the dust in the rotor downwash. Factors were the dusty gravel landing area and the pilot's… - [NTSB CHI03FA056](https://openairdocs.org/ntsb/CHI03FA056), Jan 16, 2003: Bell 206L-1 (N3194P), B.S. 53, LA, destroyed, 1 fatal. Probable cause: The improper approach by the pilot and the settling with power encountered by the pilot. - [NTSB CHI02FA288](https://openairdocs.org/ntsb/CHI02FA288), Sep 10, 2002: Bell 206L-1 (N400SL), Doland, SD, destroyed, 4 fatal. Probable cause: Pilot spatial disorientation while flying in dark night conditions, resulting in a loss of aircraft control; and the company's inadequate remedial actions after identifying the pilot's night flying… - [NTSB DEN02LA044](https://openairdocs.org/ntsb/DEN02LA044), May 18, 2002: Bell 206L-1 (N3894Q), Salem, UT, substantial damage. Probable cause: a loss of tail rotor effectiveness during takeoff. A contributing factor was the wind gusts. - [NTSB ATL02FA048](https://openairdocs.org/ntsb/ATL02FA048), Feb 16, 2002: Bell 206L-1 (N23PJ), New Smyrna Bch., FL, destroyed, 2 fatal. Probable cause: The pilot continued visual flight into instrument conditions that resulted in the in-flight collision with trees. Factor were the pilot's alcohol impaired condition, and low cloud conditions. - [NTSB SEA02LA014](https://openairdocs.org/ntsb/SEA02LA014), Nov 14, 2001: Bölkow BO 105 LS (N93LF), Mud Lake, ID, destroyed. Probable cause: Pilot's failure to maintain adequate separation from terrain during the initial climb. Factors include spatial disorientation and a dark moonless night. - [NTSB NYC01LA088](https://openairdocs.org/ntsb/NYC01LA088), Mar 23, 2001: Bell 206 L-1 (N2138Y), Seneca Falls, NY, substantial damage. Probable cause: the loss of a bolt in a Thomas coupling on the tail rotor drive shaft, for undetermined reasons, during climb, while operating over unsuitable terrain. - [NTSB ATL99LA006](https://openairdocs.org/ntsb/ATL99LA006), Oct 10, 1998: Hiller FH-1100 (N580RH), Fayette, MS, substantial damage. Probable cause: The fuel filter contamination which resulted in the loss of engine power. The air leak in the fuel system was a factor. - [NTSB FTW97RA323](https://openairdocs.org/ntsb/FTW97RA323), Aug 21, 1997: Bell 206L-1 (N2246Q), Arica, Peru, 3 fatal - [NTSB BFO94FA013](https://openairdocs.org/ntsb/BFO94FA013), Nov 20, 1993: Bell 206L-1 (N911ME), Portland, ME, destroyed, 3 fatal. Probable cause: THE PILOT'S CONTINUED VFR FLIGHT INTO INSTRUMENT METEOROLOGICAL CONDITIONS, AND HIS FAILURE TO ASSURE THAT ADEQUATE FUEL WAS AVAILABLE TO COMPLETE THE FLIGHT, RESULTING IN A LOSS OF ENGINE POWER DUE… - [NTSB FTW93LA081](https://openairdocs.org/ntsb/FTW93LA081), Feb 8, 1993: Bell 206L-1 (N2244W), Vermillion 39, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN PROPER ALTITUDE. - [NTSB LAX88FA330](https://openairdocs.org/ntsb/LAX88FA330), Sep 29, 1988: Bell 206L-1 (N2246Q), Santa Barbara, CA, substantial damage. Probable cause: FAILURE OF THE #1 TURBINE WHEEL. CONTRIBUTING TO THIS ACCIDENT WAS THE UNREPORTED OVER TEMPERATURE CYCLES OF THE ENGINE. ALSO CONTRIBUTING WAS THE UNSUITABILITY OF THE LANDING SURFACE FROM THE… - [NTSB FTW88DRD10](https://openairdocs.org/ntsb/FTW88DRD10), Jun 27, 1988: Bell 206L-1 (N2611), Houma, LA, substantial damage - [NTSB CHI88FA079](https://openairdocs.org/ntsb/CHI88FA079), Mar 18, 1988: Bell 206L-1 (N5759H), Taylorville, IL, destroyed - [NTSB FTW87LA195](https://openairdocs.org/ntsb/FTW87LA195), Aug 12, 1987: Bell 206L-1 (N2764F), New Iberia, LA, substantial damage - [NTSB SEA87MA034](https://openairdocs.org/ntsb/SEA87MA034), Dec 4, 1986: Bell 206L-1 (N7EC), Pendleton, OR, destroyed, 3 fatal - [NTSB LAX85LA092](https://openairdocs.org/ntsb/LAX85LA092), Jan 3, 1985: Bell 2061-1 (N2246Q), Santa Barbara, CA, substantial damage - [NTSB LAX83FA420](https://openairdocs.org/ntsb/LAX83FA420), Sep 4, 1983: Hughes 369HS (N8500N), Ventura, CA, destroyed, 1 fatal - [NTSB FTW82DA144](https://openairdocs.org/ntsb/FTW82DA144), Apr 22, 1982: Bell 206L-1 (N2138Y), Cameron, LA, substantial damage - [NTSB DEN82DA022](https://openairdocs.org/ntsb/DEN82DA022), Jan 23, 1982: Bell/Textron 206 L-1 (N1085T), 36 Sw Laramie, WY, substantial damage - [NTSB FTW81FA082](https://openairdocs.org/ntsb/FTW81FA082), Apr 29, 1981: Bell 206L-1 (N2774V), Angleton, TX, substantial damage ## FAA accident and incident reports (53, 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 20260404003829A](https://openairdocs.org/incident/20260404003829A), Apr 4, 2026: Bell Helicopter Textron 206L-1 (N5017G), Livingston, MT, Destroyed. Description of the deviation: While operating in VFR conditions, [privacy data omitted], [privacy data omitted] crashed in a small clearing approximately 18… - [Incident 20260325002849I](https://openairdocs.org/incident/20260325002849I), Mar 25, 2026: Bell Helicopter Textron 206L-1 (N176AE), Dickson, TN, No damage. While en route to troy, TN from the nashville, TN area, the helicopter encountered electrical issues approximately 6 to 7 nautical miles northeast of the… - [Accident 20250723011679A](https://openairdocs.org/incident/20250723011679A), Jul 23, 2025: Bell Helicopter Textron 206L-1 (N2611), Thibodaux, LA, Destroyed, 1 fatal. On July 23, 2025, about 0630 central daylight time, a Bell 206L-1 helicopter, was destroyed when it was involved in an accident near Thibodaux, Louisiana. The… - [Accident 20231228019719A](https://openairdocs.org/incident/20231228019719A), Dec 28, 2023: Bell Helicopter Textron 206L-1 (N571CJ), Walland, TN, Substantial damage. During sight seeing tour flight, pilot observed an illuminated eng chip light. During monovering for landing, pilot heard abnormal noise and observed engine… - [Incident 20181120017349I](https://openairdocs.org/incident/20181120017349I), Nov 20, 2018: Bell Helicopter Textron 206L-1 (N96AE), Salem, MO, No damage. On November 20, 2018, at approximately 11:31 CST, N96AE, a BHT-206-L1, s/n 45751, located at air evac EMS, inc. base AE-018 in Salem, Missouri, experienced an… - [Incident 20160830015479I](https://openairdocs.org/incident/20160830015479I), Aug 30, 2016: Bell Helicopter Textron 206L-1 (N233BB), Pelican Rapids, MN, Minor damage. Pilot was performing an agricultural spraying operation and impacted power lines at the south end of the field. The wire cutter on the aircraft cut the top… - [Accident 20150215001649A](https://openairdocs.org/incident/20150215001649A), Feb 15, 2015: Bell Helicopter Textron 206L-1 (N3176L), Sevierville, TN, Substantial damage. During run up while sitting on the helipad pilot attempted to increase collective and power. At that time the aircraft shuttered. Pilot reduced collective.… - [Accident 20130606014989A](https://openairdocs.org/incident/20130606014989A), Jun 6, 2013: Bell Helicopter Textron 206L-1 (N114AE), Manchester, KY, Destroyed, 3 fatal. At 2315 hours on 6/6/2013, aircraft crashed under unknown circumstances in a school parking lot, approximately 750 from the operator's home base heliport,… - [Incident 20120904029009I](https://openairdocs.org/incident/20120904029009I), Sep 4, 2012: Bell Helicopter Textron 206L-1 (N74AE), Harrison, AR, Minor damage. On September 4, 2012 the left-hand chin bubble departed the aircraft while in cruise-flight. Subsequent investigation determined that the chin bubble had been… - [Incident 20110222004039I](https://openairdocs.org/incident/20110222004039I), Feb 22, 2011: Bell Helicopter Textron 206L-1 (N2611), Abbeville, LA, Minor damage. While performing a maintenance operation check flight after the engine hot section had been removed and reinstalled the night before, the engine failed (quit)… - [Accident 20090702011799A](https://openairdocs.org/incident/20090702011799A), Jul 2, 2009: Bell 206L1 (N38AZ), Summit County, CO, Destroyed. (-23) While performing an external load operation the pilot noticed the aircraft start to rotate he attempted to stop the rotation but was unable, he then… - [Accident 20081013850829A](https://openairdocs.org/incident/20081013850829A), Oct 13, 2008: Bell 206L4 (N6ZV), Conroe, TX, Destroyed, 2 fatal. On October 13, 2008, at 1109 central daylight time, a Bell 206L-4, N6ZV, was destroyed when the engine lost power and the helicopter struck trees, impacted… - [Accident 20071229830079A](https://openairdocs.org/incident/20071229830079A), Dec 29, 2007: Bell 206L1 (N211EL), Gulf Of Mexico, US, Substantial damage, 1 fatal. (-23) Pilot continued to destination platform (SP38) after weather deteriorated to approximately 300' ceiling with 1 mile visibility. Company general… - [Accident 20060413005539A](https://openairdocs.org/incident/20060413005539A), Apr 13, 2006: Bolkms BO105LSA3 (N202LF), Green Bay, WI, Destroyed, 1 fatal. (-23) During the crash investigation it was found that the forward bolts that attach the tail rotor drive shaft to the input side of the thomas coupling at the… - [Accident 20050502011379A](https://openairdocs.org/incident/20050502011379A), May 2, 2005: Bell 206L1 (N3895D), Peach Springs, AZ, Substantial damage. (-23) On may 2, 2005, at approximately 0945 mountain standard time, N3895D, a Bell 206-L1 aircraft made an emergency landing in a wooded area during an… - [Accident 20050430006119A](https://openairdocs.org/incident/20050430006119A), Apr 30, 2005: Bell 206L1 (N66RR), Cherokee, NC, Destroyed. (-23) Pilot was attempting to depart helipad when the pilot induced dynamic roll over by using incorrect control inputs. Helicopter then rolled over on right… - [Accident 20050313003929A](https://openairdocs.org/incident/20050313003929A), Mar 13, 2005: Bell 206L1 (N480RA), Gulf Of Mexico, US, Destroyed. (-23) Aircraft was at flight idle on oil rig ST220. Pilot had his head down, and writing in his log, when he felt an uncommanded lift to the rear. He… - [Incident 20040507028449I](https://openairdocs.org/incident/20040507028449I), May 7, 2004: Bell 206L1 (N3188P), New Iberia, LA, Minor damage. (-23) During a recurrent training flight, the flight crew entered a 180 degree autorotation, during the deceleration the flying pilot applied too much aft… - [Accident 20031224035189A](https://openairdocs.org/incident/20031224035189A), Dec 24, 2003: Agusta A109 (N25RX), Mendocino, CA, Destroyed, 3 fatal. (-23) 12-22-03, Reach/mediplane inc. (jbza) departed santa rosa to willits CA, at approx. 1930 PDT, to pick up a medical patient. Between ukiah and willits CA,… - [Accident 20030920023469A](https://openairdocs.org/incident/20030920023469A), Sep 20, 2003: Bell 206L1 (N74AE), Shoals, IN, Substantial damage. (-23) On September 20, 2003, at 2338 EST, a Bell helicopter model 206-L1, N74AE, registered to air evac leasing corp. made a hard landing at a gypsum quarry… - [Accident 20030116034889A](https://openairdocs.org/incident/20030116034889A), Jan 16, 2003: Bell 206L1 (N3194P), Venice, LA, Destroyed, 1 fatal. (-23) During an approach to landing on an offshore helideck, the pilot terminated his approach with a right turn away from the landing area. The helicopter,… - [Accident 20020909025909A](https://openairdocs.org/incident/20020909025909A), Sep 9, 2002: Bell 206L1 (N400SL), Doland, SD, Destroyed, 4 fatal. (-23) On September 10, 2002, at approximately 9:52 pm CDT, a Bell helicopter m/n BHT-206-L1, s/n 45235, N400SL, operated by omniflight helicopters inc., 135… - [Accident 20020518009749A](https://openairdocs.org/incident/20020518009749A), May 18, 2002: Bell 206L1 (N3894Q), Salem, UT, No damage. (.19) On may 18, 2002, at 1449 mountain daylight time, a Bell 206L-1, N3894Q, operated by classic helicopters, inc., of woods cross, Utah, was destroyed when… - [Accident 20020216009179A](https://openairdocs.org/incident/20020216009179A), Feb 16, 2002: Bell 206L1 (N23PJ), Newsmyrnabeach, FL, No damage, 2 fatal. (-23) On February 16, 2002, at 06:11 EST, a Bell 206L-1 helicopter, N23PJ, collided with trees while maneuvering for a landing at spruce creek airport near new… - [Accident 20011114032029A](https://openairdocs.org/incident/20011114032029A), Nov 14, 2001: Bolkms BO105LSA3 (N93LF), Mudlake, ID, No damage. (-23) Pilot made a precautionary landing in a remote area because main fuel tank transfer pumps were not transferring fuel to the supply tank (low fuel… - [Accident 20010323007209A](https://openairdocs.org/incident/20010323007209A), Mar 23, 2001: Bell 206L1 (N2138Y), Tyre, NY, No damage. (-23)On 3-23-01, pilot [privacy data omitted] and passenger [privacy data omitted], departed in N2183Y, a Bell 206 L1, s/n 45639, operated by EMS air services,… - [Incident 20000708024029I](https://openairdocs.org/incident/20000708024029I), Jul 8, 2000: Bell 206L1 (N206SL), Gulf Of Mexico, Minor damage. (-23)During a normal to shallow approach to an offshore platform (west cameron 575B), pilot misjudged three feet termination to hover altitude. The helicopter… - [Accident 19981010028849A](https://openairdocs.org/incident/19981010028849A), Oct 10, 1998: Hiller FH1100 (N580RH), Fayette, MS, Substantial damage. Helicopter was involved in aerial application when the engine failed, the pilot auto rotated the acft, and the acft struck a log and rolled over. (.19) engine… - [Incident 19970831030229I](https://openairdocs.org/incident/19970831030229I), Aug 31, 1997: Bell 206L1 (N3194P), Cantwell, AK. Narrative: during cruise flight torque began fluctuating from 0-70%. No yaw or other adverse indications. Within 30 seconds engine oil pressure dropped from… - [Incident 19961029037929I](https://openairdocs.org/incident/19961029037929I), Oct 29, 1996: Bell 206L1 (N3907M), Bridgeport, OH, Minor damage. Narrative: Mr. Frank x. o'toole, pilot-in-command of N3907M, a Bell 206-L1 rotorcraft, departed latobe, pa enroute to dayton, OH. During cruise flight, the… - [Incident 19960613018699I](https://openairdocs.org/incident/19960613018699I), Jun 13, 1996: Bell 206L1 (N400SL), Madison, SD. Narrative: engine replaced on site due to excessive metal particles found on chip detector, engine high temp and engine oil temperature high readings.… - [Accident 19931119043949A](https://openairdocs.org/incident/19931119043949A), Nov 19, 1993: Bell 206L1 (N911ME), Portland, ME, Destroyed, 3 fatal. Encountered strong headwind. Ran out of fuel on vectors to airport. Ditched ocean bay. Sank. Rain fog high waves. - [Incident 19930604026359I](https://openairdocs.org/incident/19930604026359I), Jun 4, 1993: Bell 206L1 (N3194P), Fairbanks, AK. Upon restarting engine chip detector light illuminated. Shut engine down. Gound carbon on chio detector plug. - [Accident 19930208001879A](https://openairdocs.org/incident/19930208001879A), Feb 8, 1993: Bell 206L1 (N2244W), Intracoastal Ci, LA, Substantial damage. Settled into water after departing a gulf oil platform. Failed to note descent due preoccupation inside cockpit. - [Incident 19901214061619I](https://openairdocs.org/incident/19901214061619I), Dec 14, 1990: Bell 206L1 (N104HC), Long Beach, CA, Substantial damage. Helicopter on cart. Oil leak test. Began to spin as pilot tried to become airborne to avoid mechanic. Rolled over. - [Incident 19900406018589I](https://openairdocs.org/incident/19900406018589I), Apr 6, 1990: Bell 206L1 (N3194P), Gulf Of Mexico, LA, Minor damage. Pilot allowed tail rotor to come in contact with an obstruction while landing on an offshore platform. - [Incident 19890724050829I](https://openairdocs.org/incident/19890724050829I), Jul 24, 1989: Bell 206L1 (N3188P), Belle Chasse, LA, Minor damage. Engine failure on final approach. Autorotated to a canal. Rolled over. Found failed first stage power turbine wheel - [Accident 19880929069679A](https://openairdocs.org/incident/19880929069679A), Sep 29, 1988: Bell 206L1 (N2246Q), Santa Barbara, CA, Substantial damage. Engine failed on approach. Made autorotation run landing. Hit steel plate on ramp. Turbine failure from overtempts. - [Accident 19880627027319A](https://openairdocs.org/incident/19880627027319A), Jun 27, 1988: Bell 206L1 (N2611), Houma, LA, Substantial damage. Engine quit en route. Autorotated to a hard landing chopping off tailboom. Found water in fuel control unit. - [Accident 19880317005779A](https://openairdocs.org/incident/19880317005779A), Mar 17, 1988: Bell 206L (N5759H), Taylorville, IL, Destroyed. Indicates loss of tail rotor effect en route in heavy wet snow. Vertical spin to ground impact. Possible icing. - [Incident 19871212077069I](https://openairdocs.org/incident/19871212077069I), Dec 12, 1987: Bell 206L1 (N2764F), New Iberia, LA, Minor damage. Practice autorotation. Touched down in muddy area. No ground run. Rocked on skids. Main rotor struck tail drive shaft - [Incident 19871021072539I](https://openairdocs.org/incident/19871021072539I), Oct 21, 1987: Hiller FH1100 (N580RH), Fresno, CA. Engine flamed out en route. Pilot did not have required fuel reserve. Flight purpose was traffic watch. - [Accident 19870812046019A](https://openairdocs.org/incident/19870812046019A), Aug 12, 1987: Bell 206L1 (N2764F), New Iberia, LA, Substantial damage. The tailboom fell off during practice autorotations. Suspect pilot let rotor speed fall into resonance range. - [Incident 19870409019359I](https://openairdocs.org/incident/19870409019359I), Apr 9, 1987: Bell 206L1 (N2764F), New Iberia, LA, Minor damage. The helicopter landed hard during a practice autorotation after maneuvering to avoid a stake in the ground. - [Accident 19861203063959A](https://openairdocs.org/incident/19861203063959A), Dec 3, 1986: Bell 206L1 (N7EC), Pendleton, OR, Destroyed, 2 fatal. The helicopter impacted the ground in night, IFR conditions. Aircraft was on special VFR clearance. Entered clouds. - [Incident 19861114055749I](https://openairdocs.org/incident/19861114055749I), Nov 14, 1986: Bell 206L1 (N3194P), Texas City, TX, Minor damage. Landed after loud bang and aircraft turned to right. Main rotor blade caused damage on landing. - [Incident 19851118067209I](https://openairdocs.org/incident/19851118067209I), Nov 18, 1985: Bell 206L1 (N2764F), New Iberia, LA, Minor damage. Made run on type landing in rough uneven ground. Bounced with low RPM and main rotor struck vertical fin, tailboom. - [Incident 19850707037229I](https://openairdocs.org/incident/19850707037229I), Jul 7, 1985: Bell 206L1 (N2764F), New Iberia, LA, Minor damage. Student pulled pitch and aircraft became airborne after touchdown. Landed hard and main rotor hit tail rotor shaft. - [Accident 19850103000149A](https://openairdocs.org/incident/19850103000149A), Jan 3, 1985: Bell 206L1 (N2246Q), South Bend, IN, Substantial damage. Reported engine flameout on departure. Autorotated to beach. Stretched glide. Low rotor speed chopped tailboom. - [Accident 19830904045719A](https://openairdocs.org/incident/19830904045719A), Sep 4, 1983: Hughes 369HS (N8500N), Ventura, CA, Destroyed. Helicopter crashed into ocean offshore in dark night. No mechanical defects. Pilot not rated in helicopters. All 53: https://openairdocs.org/engine/allison-250-c28-series/incidents.md ## Service difficulty reports (70, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR EVCA201811271](https://openairdocs.org/sdr/EVCA201811271), Nov 24, 2018: ENGINE. FLAMED OUT. ENGINE FAILED WHEN THROTTLE ROLLED TO IDLE DURING AUTOROTATION SPEED CHECK. PERFORMED AUTOROTATION LANDING. AIRCRAFT WAS INSPECTED WITH NO FUEL LEAKS. PERFORMED - [SDR C9PA201711030001](https://openairdocs.org/sdr/C9PA201711030001), Nov 3, 2017: PACKING. LEAKING. PILOT DETECTED FUEL ODOR IN CABIN. FOUND THE FUEL SWITCH PACKING LEAKING. - [SDR YTRA2016060715801](https://openairdocs.org/sdr/YTRA2016060715801), Jun 6, 2016: FUEL CONTROL. FAILED. IN THE COURSE OF A PRACTICE AUTOROTATION, THE ENGINE FLAMED OUT WHEN THE THROTTLE WAS ROLLED TO THE IDLE DETENT POSITION. - [SDR CA150327010](https://openairdocs.org/sdr/CA150327010), Mar 26, 2015: SKID. CRACKED. (CAN) DURING REMOVAL OF GROUND HANDLING WHEELS THE RT SKID TUBE WAS FOUND TO BE CRACKED AROUND THE COMPLETE CIRCUMFERENCE OF THE SKID TUBE AT THE FORWARD GROUND - [SDR EVCA201304220040](https://openairdocs.org/sdr/EVCA201304220040), Apr 22, 2013: BULKHEAD. CRACKED. RT BULKHEAD ASSY AT FS 146 CRACKED AT INBD SECTION NEAR THE BOX BEAM ASSY. - [SDR EVCA201304230041](https://openairdocs.org/sdr/EVCA201304230041), Apr 22, 2013: CHANNEL. CRACKED. AT FS 155 CHANNEL CRACKED AT BOTH ENGINE MOUNT ATTACHMENT FITTINGS. - [SDR CA121106008](https://openairdocs.org/sdr/CA121106008), Nov 4, 2012: MAGNETIC SEAL. LEAKING. (CAN) MAIN ROTOR TRANSMISSION INPUT MAG SEAL LEAKING. SEAL REPLACED. - [SDR 3HCR03222012](https://openairdocs.org/sdr/3HCR03222012), Mar 22, 2012: BUSHING. MISINSTALLED. GOVERNOR ALLOWS ENGINE TO OVERSPEED. FAILED SHOP TEST. DIASSEMBLED AND FOUND UNIT IMPROPERLY ASSEMBLED. SPOOL BUSHING ANTI-ROTATION TANG WAS ENGAGED IN LEVER SL - [SDR 2011FA0000574](https://openairdocs.org/sdr/2011FA0000574), Sep 3, 2011: STUD. WORN. ACFT WAS IN CRUISE FLT, PILOT NOTICED OIL PRESSURE DEMINISHING, PILOT INITIATED LANDING. ONCE ACFT WAS ON THE GROUND PILOT NOTICED OIL PRESSURE AT FLUCTUATING F - [SDR YTRA1105401](https://openairdocs.org/sdr/YTRA1105401), Feb 22, 2011: ENGINE. MALFUNCTIONED. IN CRUISE FLIGHT THE PILOT REPORTED HIGH FREQUENCY VIBRATION AND WHINING NOISE FROM THE ENGINE COMPARTMENT. THIS WAS FOLLOWED BY AN ENGINE CHIP LIGHT INDICATION - [SDR EVCA00007](https://openairdocs.org/sdr/EVCA00007), Sep 21, 2010: CHIN BUBBLE. DETACHED. APPROX 3 NM NW OF AIRPORT HEARD A NOISE. A FEW MOMENTS PASSED AND THEN THERE WAS A "POP", A QUICK PRESSURE CHANGE AND AIRFLOW INTO THE COCKPIT. DISCOVERED THE G - [SDR EVCA00006](https://openairdocs.org/sdr/EVCA00006), Jun 2, 2010: BULKHEAD. CRACKED. DURING A ROUTINE INSP, MECHANIC FOUND CRACK ON BULKHEAD STA NR 142, WL 61, ON THE RT SIDE GENERATING FROM A NUTPLATE SCREW LOCATION. - [SDR EVCA00003](https://openairdocs.org/sdr/EVCA00003), Apr 24, 2010: SUPPORT. CRACKED. DURING A ROUTINE INSP, MECHANIC FOUND RT (PILOT) SUPPORT ASSY CRACKED. SUPPORT ASSY R & R. - [SDR EVCA731D](https://openairdocs.org/sdr/EVCA731D), Mar 9, 2010: ATTACH FITTING. CRACKED. DURING A ROUTINE INSP, MX FOUND UPPER LT ATTACHMENT FITTING ON FUSELAGE AFT BULKHEAD CRACKED. ATTACHMENT FITTING R & R. - [SDR CA070706002](https://openairdocs.org/sdr/CA070706002), Jul 5, 2007: SCROLL. WARPED. (CAN) DURING A GROUND RUN AN AIR LEAK WAS FOUND AT THE SCROLL DIFFUSER SPLIT LINE. COMPRESSOR ASSY WAS CHANGED OUT. (TC NR 20070706002) - [SDR CA070706004](https://openairdocs.org/sdr/CA070706004), Jul 5, 2007: FUEL CONTROL. UNSERVICEABLE. (CAN) FUEL CONTROL WAS INTERMITTENT ON ENGINE LIGHT-OFF DURING A START. FUEL CONTROL CHANGED OUT. (TC NR 20070706004) - [SDR CA070601003](https://openairdocs.org/sdr/CA070601003), May 28, 2007: FUEL CELL. LEAKING. (CAN) FUEL SMELL NOTED. INSPECTION FOUND SMALL FUEL LEAK. FUEL CELL REMOVED SENT OUT FOR REPAIR, REINSTALLED. (TC NR 20070601003) - [SDR CA070404007](https://openairdocs.org/sdr/CA070404007), Apr 4, 2007: FUEL CELL. LEAKING. (CAN) RETURNING FROM A FLIGHT IT WAS NOTED THERE WAS A FUEL ODOR IN THE REAR CABIN. INVESTIGATING DETERMED THE LT FWD FUEL CELL HAD A SMALL LEAK. FUEL CELL WAS - [SDR CA060808005](https://openairdocs.org/sdr/CA060808005), Jul 19, 2006: SCROLL. CRACKED. (CAN) HIGH TOT WAS NOTICED IN CRUISE. ON RETURNING A POWER CHECK WAS CARRIED OUT AND LOW POWER WAS DETECTED. A HAIT LINE CRACK WAS IDENTIFIED BY VISUAL INSPECTI - [SDR B652006F00000](https://openairdocs.org/sdr/B652006F00000), Apr 13, 2006: BOLT. SHEARED. DURING COURSE OF AN ACCIDENT INVESTIGATION, IT WAS NOTED THAT BOLTS THAT CONNECT TAIL ROTOR DRIVE SHAFT TO INPUT THOMAS COUPLING OF INTERMEDIATE GEARBOX WERE SH - [SDR 2005FA0001637](https://openairdocs.org/sdr/2005FA0001637), Nov 16, 2005: OIL TANK. LEAKING. 206-061-505-109 ENGINE OIL RESERVOIR BEGAN TO LEAK ENGINE OIL. - [SDR 2005FA0001638](https://openairdocs.org/sdr/2005FA0001638), Nov 16, 2005: OIL TANK. LEAKING. 206-061-505-109 ENGINE OIL RESERVOIR BEGAN TO LEAK ENGINE OIL - [SDR B65A106298](https://openairdocs.org/sdr/B65A106298), Oct 12, 2005: SHIELD. BROKEN. SHIELD, BROKEN AND REPLACED. - [SDR B65A106299](https://openairdocs.org/sdr/B65A106299), Oct 12, 2005: SHIELD. BROKEN. SHIELD, BROKEN AND REPLACED. - [SDR B65A106300](https://openairdocs.org/sdr/B65A106300), Oct 12, 2005: SHIELD. BROKEN. SHIELD, BROKEN AND REPLACED. - [SDR CA051018006](https://openairdocs.org/sdr/CA051018006), Oct 12, 2005: RESTRAINT. DELAMINATED. DELAMINATION FOUND ON AFT TRANSMISSIN MOUNT ELASTOMERIC. MOUNT CHANGED. - [SDR B65A106278](https://openairdocs.org/sdr/B65A106278), Sep 29, 2005: HYDRAULIC SYSTEM. LEAKING. LEAKING HYDRAULIC UNIT. - [SDR B65A106130](https://openairdocs.org/sdr/B65A106130), Sep 21, 2005: METER. UNSERVICEABLE. TORQUE KEEPS FLUCTUATING. - [SDR B65A106213](https://openairdocs.org/sdr/B65A106213), Sep 21, 2005: CONTROL UNIT. UNSERVICEABLE. CONTROL UNIT IS CAUSING AN UNCONTROLLABLE LATERAL INPUT. - [SDR CA051004004](https://openairdocs.org/sdr/CA051004004), Sep 6, 2005: CONTACTOR. BURNED. (CAN) DURING CRUISE PORTION OF A SHORT (15 MIN) CREW TRANSFER FLIGHT, THE PILOT AND 2 PASSENGERS ABOARD SMELLED/SAW FUMES/SMOKE IN COCKPIT. ELECTRICAL SYSTEMS W - [SDR YTRR104956](https://openairdocs.org/sdr/YTRR104956), Jul 25, 2005: FUEL FILTER. CRACKED. FILTER HEAD WEBBING INSIDE WAS CRACKED. REPLACED FILTER HEAD ASSY. - [SDR CA050706009](https://openairdocs.org/sdr/CA050706009), Jun 27, 2005: CARTRIDGE. NOISY. (CAN) FUEL BOOST PUMP MAKING NOISES. PUMP CHANGED. - [SDR B652005F00000](https://openairdocs.org/sdr/B652005F00000), May 20, 2005: SWITCH. STUCK. WHEN PERFORMING THE FUNCTIONAL TEST OF THE HYDRAULIC SYSTEM, CHAPTER 43-14, PG 24 OF THE MM. UNABLE TO GET THE HYDRAULIC UNIT TO SWITCH OVER TO THE NR 2 POSITIO - [SDR HE66100341](https://openairdocs.org/sdr/HE66100341), Apr 17, 2005: FIREWALL. CRACKED. FIREWALL IS CRACKED BY FASTNERS AND HAS BEEN REPAIRED SEVERAL TIMES BEFORE. INTEGRITY IS COMPROMISED AND DO NOT WANT ENGINE TO INGEST FOD. - [SDR HE66100337](https://openairdocs.org/sdr/HE66100337), Apr 16, 2005: SKID. UNSERVICEABLE. RIVETS PULLED AND GOUGES IN BOTTOM OF TUBE. - [SDR HE66099998](https://openairdocs.org/sdr/HE66099998), Mar 24, 2005: STARTER GEN. UNSERVICEABLE. NR 2 ENG FAILED TO START. STARTER GENERATOR UNSERVICEABLE. - [SDR PG9R97953](https://openairdocs.org/sdr/PG9R97953), Nov 5, 2004: FUEL NOZZLE. CRACKED. FUEL NOZZLE SPRAY SHROUD CRACKED. A NEW MATERIAL SHOULD BE USED FOR THE SPRAY SHROUD. (K) - [SDR HE66097817](https://openairdocs.org/sdr/HE66097817), Oct 21, 2004: TORQUEMETER. UNSERVICEABLE. FLUCTUATING OVER 40 PERCENT WITH NO CHANGE IN N1 OR TOT. - [SDR HE66097244](https://openairdocs.org/sdr/HE66097244), Sep 10, 2004: BEARING. WORN. BEARINGS ARE WORN CAUSING EXCESSIVE PLAY. - [SDR HE66096553](https://openairdocs.org/sdr/HE66096553), Jul 29, 2004: SEAT. TORN. SEAT TORN, CUSHION HAS NO SUPPORT. - [SDR HE66096552](https://openairdocs.org/sdr/HE66096552), Jul 21, 2004: SEAT. CRUSHED. CRUSHABLE SEATS WERE CRUSHED. - [SDR HE66096545](https://openairdocs.org/sdr/HE66096545), Jul 16, 2004: PRESSURE SWITCH. UNSERVICEABLE. PRESSURE SWITCH FAILED AND REPLACED. - [SDR ALGA093984](https://openairdocs.org/sdr/ALGA093984), Mar 21, 2004: BLADE. CORRODED. FOUND MAIN ROTOR TRAILING EDGE EXTRUSION EXFOLIATED APPROXIMATELY 2.5. - [SDR ALG2004F00001](https://openairdocs.org/sdr/ALG2004F00001), Nov 11, 2003: B-NUT. LOOSE. IN FLIGHT SMELLED SLIGHT ODOR OF FUEL. ON POST FLIGHT SAW DRIPS OF FUEL ON LINES AROUND FUEL CONTROL. MAINTENANCE FOUND B-NUT ON FUEL CONTROL INLET FROM PUMP SE - [SDR 2003FA0001118](https://openairdocs.org/sdr/2003FA0001118), Oct 17, 2003: BEARING. FAILED. DURING ROUTINE DAILY INSPECTION OF HELICOPTER USED IN EMS, MECHANIC NOTICED NR 5 TAIL ROTOR BEARING GREASE SEAL HAD SEPARATED FROM BEARING. FRAGMENTS OF THE PHE - [SDR ALG2003F00081](https://openairdocs.org/sdr/ALG2003F00081), Aug 27, 2003: ENGINE. FAILED. DURING TAKE OFF, THE PILOT CALLED ON THE PHONE AND REPORTED THAT DURING TAKE OFF AND CLIMB AFTER FUELING, THE AIRCRAFT EXPERIENCED FOUR LOUD BANGS AND ENGINE CH - [SDR CA030528005](https://openairdocs.org/sdr/CA030528005), May 12, 2003: FRAME. CRACKED. (CAN) CRACK FOUND IN AFT FUSELAGE FRAME. CRACK APPROXIMATELY .3750 INCH IN LENGTH LOCATED ABOVE UPPER RT TAILBOOM ATTACH BOLT MOUNTING BOLT HOLE. FOUND DURING 1 - [SDR HE66084852](https://openairdocs.org/sdr/HE66084852), Feb 28, 2003: IGNITER BOX. DEFECTIVE. NR 1 ENGINE WOULD NOT START, EXCITER BOX WAS NOT PUTTING OUT REPLACED - [SDR CA030204014](https://openairdocs.org/sdr/CA030204014), Jan 20, 2003: LEVER. FAILED. (CAN) REQUIRED BOLT PN NAS6604D8 (AS PER 206L IPC) WOULD NOT FIT IN EXISTING HOLE OF FUEL CONTROL LEVER PN 206064713101 WITHOUT ENLARGING HOLE. - [SDR HEEA083304](https://openairdocs.org/sdr/HEEA083304), Jan 9, 2003: BLEED VALVE. FAILED. LOUD BANG FROM COMPRESSOR ON TAKEOFF FOLLOWED BY 4 MORE BANGS. REPLACED WITH SERVICEABLE BLEED VALVE. All 70: https://openairdocs.org/engine/allison-250-c28-series/reports.md ## STCs that may be installed (OpenAirDocs) (6) 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 SE00057AT](https://openairdocs.org/stc/SE00057AT): Installation of Aeronautical Accessories, Inc., Pc Safety Valve Kit. Bell Helicopter Textron 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-C28B - [STC SE00026EN](https://openairdocs.org/stc/SE00026EN): Installation of Pratt & Whitney Engine Services Inc. IntelliStart Plus Electronic Control Unit (ECU), P/N DPU-K-010 on specified 250 engine models. Pratt & Whitney Engine Services Inc - [STC SE578GL](https://openairdocs.org/stc/SE578GL): Installation of a fuel flow transducer. Shadin Avionics. Lists 250-C28B - [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. Lists 250-C28B ## PMA parts (OpenAirDocs) (714, first 50) Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this engine model on its data sheet, so check the FAA record before relying on it. Newest first. - [2691794HT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID192280472920240802140700.0001): Bearing, Ball (Drive). HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2691794 · Apr 4, 2024 - [82010546-001HT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID198764457620230717173048.0001): Bearing, Ball (Drive). HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 82010546-001 · May 22, 2023 - [82010580-001HT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID163424415620230717173050.0001): Grease, Aircraft Bearing. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 82010580-001 · May 22, 2023 - [2549171-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID133350387220230907182150.0001): Governor Assembly, Power Turbine. Honeywell International Inc. · PMA PQ1222NM · Replaces 23086774 · Mar 10, 2023 - [2549171](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID118302742720230907182151.0001): Power Turbine Governor. Honeywell International Inc. · PMA PQ1222NM · Replaces 23076419 · Mar 10, 2023 - [6843361HT](https://drs.faa.gov/browse/excelExternalWindow/FEFFC83511F3456B862585500062B6AE.0001): Cage, Ball Bearing-1.024 ID X .312 Wide (and Oversizes). HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6843361 · Apr 30, 2019 - [2537525HT](https://drs.faa.gov/browse/excelExternalWindow/FE2CFD93295E4A9586258550006312B3.0001): Shaft, Shouldered, Eccentric. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2537525 · Apr 30, 2019 - [2539533HT](https://drs.faa.gov/browse/excelExternalWindow/FDF710A0D9BAAADD8625855000632B9C.0001): Bearing, Sintered. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539533 · Apr 30, 2019 - [951190HT](https://drs.faa.gov/browse/excelExternalWindow/FC8B8869AAFBA24A8625855000632D54.0001): Pin, Sraight, Headless. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 951190 · Apr 30, 2019 - [2521745HT](https://drs.faa.gov/browse/excelExternalWindow/FB5437CD05C715928625855000631007.0001): Pin, Straight, Headed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2521745 · Apr 30, 2019 - [2523123HT](https://drs.faa.gov/browse/excelExternalWindow/F7ED1DCCD5F726178625855000635A58.0001): Diaphragm. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2523123 · Apr 30, 2019 - [47070HT](https://drs.faa.gov/browse/excelExternalWindow/F7B8FBB13C3754EE8625855000633D7A.0001): Body, Fuel Nozzle. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 47070 · Apr 30, 2019 - [6875104HT](https://drs.faa.gov/browse/excelExternalWindow/F7976EEE0864C0FC8625855000629713.0001): Washer, Flat-.190I.D. X.312X.031 THK, AMS 5516. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6875104 · Apr 30, 2019 - [H250-10113](https://drs.faa.gov/browse/excelExternalWindow/F79503304C39D6A78625855000638D3A.0001): Race, Bearing Inner, 20mm I.D.. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces M250-10113 · Apr 30, 2019 - [6856986HT](https://drs.faa.gov/browse/excelExternalWindow/F71D7C1A9289065F862585500062C13F.0001): Poppet & Seat Assy. Anti-Icing Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6856986 · Apr 30, 2019 - [23073355](https://drs.faa.gov/browse/excelExternalWindow/F65CBF7AF67669F38625855000633C45.0001): Valve, Servo-Compressor Bleed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23073355 · Apr 30, 2019 - [197498HT](https://drs.faa.gov/browse/excelExternalWindow/F58363F6C29A0E2C8625855000636674.0001): Nut, Self-Locking. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 197498 · Apr 30, 2019 - [23004513HT](https://drs.faa.gov/browse/excelExternalWindow/F536F4331CB36E2186258550006314B5.0001): Seal, Plain-Encased. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23004513 · Apr 30, 2019 - [2539728HT](https://drs.faa.gov/browse/excelExternalWindow/F443067B0718FDB0862585500062E5F1.0001): Seat, Bellows. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539728 · Apr 30, 2019 - [6853463HT](https://drs.faa.gov/browse/excelExternalWindow/F3D6B2D89D6786D486258550006375D6.0001): Tube Assy., Scav. -Oil- Gasifier Turbine Support to Accessory Hsg. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6853463 · Apr 30, 2019 - [6896098HT](https://drs.faa.gov/browse/excelExternalWindow/F32E4B1478DF1131862585500062F93E.0001): Seal, Labyrinth-Gasifier Turbine Forward. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6896098 · Apr 30, 2019 - [6808392HT](https://drs.faa.gov/browse/excelExternalWindow/F327858FDC6FA3FD862585500062EFB3.0001): Nut-Spanner, 27/32-32Thd. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6808392 · Apr 30, 2019 - [6898657HT](https://drs.faa.gov/browse/excelExternalWindow/F1BBE1994BAD8750862585500063383B.0001): Ring, Seal-Comp Disch Tube. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6898657 · Apr 30, 2019 - [6844169HT](https://drs.faa.gov/browse/excelExternalWindow/EEA08B5CE9D50D858625855000632609.0001): Tube Assy., Fuel Control to Fire Shield. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6844169 · Apr 30, 2019 - [6877277HT](https://drs.faa.gov/browse/excelExternalWindow/ED89264E3E345B9F86258550006327C1.0001): Tube Assy., Press. Fuel Control to Accumulator. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6877277 · Apr 30, 2019 - [2539170HT](https://drs.faa.gov/browse/excelExternalWindow/ED10E7C1F7943A5C862585500063453A.0001): Lever Assembly, CAM Follower Lever. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539170 · Apr 30, 2019 - [6890040HT](https://drs.faa.gov/browse/excelExternalWindow/EAB4262CF5DCF6B1862585500062F849.0001): Shield Assy., Turbine Nozzle 1st Stage. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6890040 · Apr 30, 2019 - [2539641HT](https://drs.faa.gov/browse/excelExternalWindow/EAAC9B4FF82FDB5186258550006333E2.0001): Spring, Helical, Extension. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539641 · Apr 30, 2019 - [6856984HT](https://drs.faa.gov/browse/excelExternalWindow/E8ADCF843602D53C862585500062BF66.0001): Body, Valve-Anti-Icing. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6856984 · Apr 30, 2019 - [6876030HT](https://drs.faa.gov/browse/excelExternalWindow/E79234C7BBF9CF68862585500062FEEB.0001): Stud, Shouldered, Stepped-.250-28x.500-16x1.374LG.. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6876030 · Apr 30, 2019 - [6876925HT](https://drs.faa.gov/browse/excelExternalWindow/E50B21DEC0893A14862585500062E284.0001): Tube Assy., Oil Filter Inlet. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6876925 · Apr 30, 2019 - [23032283HT](https://drs.faa.gov/browse/excelExternalWindow/E406BEB5470E1FE7862585500062DD76.0001): Pinion Bearing Cage Power Turbine. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 23032283 · Apr 30, 2019 - [6844043HT](https://drs.faa.gov/browse/excelExternalWindow/E3DD22AFB6589BF4862585500062A71B.0001): Tube, Oil Transfer. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6844043 · Apr 30, 2019 - [6899050HT](https://drs.faa.gov/browse/excelExternalWindow/E20ACA4FAC9A2EAB862585500062863D.0001): Valve-Poppet, CPRSR Bleed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6899050 · Apr 30, 2019 - [336132HT](https://drs.faa.gov/browse/excelExternalWindow/E07190E2A02F10498625855000636717.0001): Tapered Pin, Split. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 336132 · Apr 30, 2019 - [6853446HT](https://drs.faa.gov/browse/excelExternalWindow/DF8E0D4DBF0B1EA9862585500062B018.0001): Shaft, Gear-Oil Pump. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6853446 · Apr 30, 2019 - [6899051HT](https://drs.faa.gov/browse/excelExternalWindow/DF724C028D881CAF8625855000628826.0001): Valve, Servo-Compressor Bleed. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6899051 · Apr 30, 2019 - [2520570HT](https://drs.faa.gov/browse/excelExternalWindow/DC7000B2192F14888625855000633F53.0001): Rod. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2520570 · Apr 30, 2019 - [6810448HT](https://drs.faa.gov/browse/excelExternalWindow/DAF595A1CC57D376862585500062E13F.0001): Bushing-Sleeve .625 x .815 x .437. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6810448 · Apr 30, 2019 - [6876741HT](https://drs.faa.gov/browse/excelExternalWindow/DAD145C0601221568625855000636F8D.0001): Stud, Welding- Percussion .190-32 UNJF-3A. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6876741 · Apr 30, 2019 - [951388HT](https://drs.faa.gov/browse/excelExternalWindow/DA66A5873365EBC9862585500063070A.0001): Packing, Preformed O Ring. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 951388 · Apr 30, 2019 - [2539034HT](https://drs.faa.gov/browse/excelExternalWindow/D854B45671A2734E862585500063447F.0001): Weight. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2539034 · Apr 30, 2019 - [6848471HT](https://drs.faa.gov/browse/excelExternalWindow/D56C5A805DBB39DB8625855000634EEA.0001): Tube, Assy., Pressure, Oil Check Valve To Fire Shield. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6848471 · Apr 30, 2019 - [6890909HT](https://drs.faa.gov/browse/excelExternalWindow/D3CFDDD1AC5180DE862585500062896E.0001): Jet, Compressor Bleed Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6890909 · Apr 30, 2019 - [6852176HT](https://drs.faa.gov/browse/excelExternalWindow/D2E81DF924CBABBF862585500062BB43.0001): Guide Assy., Poppet-Anti-Icing Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6852176 · Apr 30, 2019 - [2537956HT](https://drs.faa.gov/browse/excelExternalWindow/D20327EF0618F354862585500063323E.0001): Pin, Shoulder, Headless. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2537956 · Apr 30, 2019 - [951390HT](https://drs.faa.gov/browse/excelExternalWindow/D0B5B6870CEFAA55862585500063078F.0001): Packing, Preformed O Ring. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 951390 · Apr 30, 2019 - [6896437HT](https://drs.faa.gov/browse/excelExternalWindow/CF4D9A2F43D117368625855000630188.0001): Strainer Assy.-Compressor-Bleed Valve. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6896437 · Apr 30, 2019 - [6877736HT](https://drs.faa.gov/browse/excelExternalWindow/CEBECB98B3BC3712862585500062ABD4.0001): Seal, Labyrinth Stator-Gasifier Turbine Brg.. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 6877736 · Apr 30, 2019 - [2520561HT](https://drs.faa.gov/browse/excelExternalWindow/C93D07A85055A49E86258550006358AA.0001): Roller. HYE-Tech Manufacturing LLC · PMA PQ2317NM · Replaces 2520561 · Apr 30, 2019 All of them: https://openairdocs.org/engine/allison-250-c28-series/pma.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.