# NTSB investigations: Allison 250-C28 series NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports. ## Latest cases - [NTSB WPR26LA146](https://openairdocs.org/ntsb/WPR26LA146.md): Bell Helicopter Textron 206L-1 · Chimney Rock, MT · Accident · No injuries · Class 4 · Limited · Final report · Apr 4, 2026 · N5017G · Substantial damage > 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.md): Bell Helicopter Textron 206L-1 · Thibodaux, LA · Accident · 1 fatal · Class 3 · Field · Final report · Jul 23, 2025 · N2611 · Destroyed > The pilot’s failure to maintain clearance to powerlines during an agricultural application pass. - [NTSB ERA24LA076](https://openairdocs.org/ntsb/ERA24LA076.md): Bell Helicopter Textron 206L-1 · Walland, TN · Accident · No injuries · Class 3 · Limited · Final report · Dec 28, 2023 · N571CJ · Substantial damage > 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.md): Bell 206 · Sevierville, TN · Accident · No injuries · Limited investigation · Final report · Feb 15, 2015 · N3176L · Substantial damage > 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.md): Bell Helicopter Textron 206L-1 · Manchester, KY · Accident · 3 fatal · Field investigation · Final report · Jun 7, 2013 · N114AE · Destroyed > 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 main rotor and tailboom. - [NTSB CEN09LA413](https://openairdocs.org/ntsb/CEN09LA413.md): Bell Helicopter Textron 206L-1 · Breckenridge, CO · Accident · Serious injuries · Limited investigation · Final report · Jul 2, 2009 · N38AZ · Substantial damage > 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 operating in the "Critical Wind Azimuth Area." - [NTSB CEN09FA012](https://openairdocs.org/ntsb/CEN09FA012.md): Bell 206 · Conroe, TX · Accident · 2 fatal · Field investigation · Final report · Oct 13, 2008 · N6ZV · Destroyed > A loss of control for undetermined reasons. - [NTSB DFW08FA053](https://openairdocs.org/ntsb/DFW08FA053.md): Bell 206L1 · Venice, LA · Accident · 1 fatal · Field investigation · Final report · Dec 29, 2007 · N211EL · Destroyed > 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. Contributing to the passenger fatality and the severity of the… - [NTSB CHI06FA110](https://openairdocs.org/ntsb/CHI06FA110.md): Messerschmitt-Bolkow-Blohm BO 105LS A-3 · Green Bay, WI · Accident · 1 fatal · Field investigation · Final report · Apr 13, 2006 · N202LF · Substantial damage > 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 anti-torque pedal cover by company personnel which blocked the flight… - [NTSB LAX05LA155](https://openairdocs.org/ntsb/LAX05LA155.md): Bell 206L-1 · Peach Springs, AZ · Accident · No injuries · Limited investigation · Final report · May 2, 2005 · N3895D · Substantial damage > a loss of power for undetermined reasons. - [NTSB ATL05CA077](https://openairdocs.org/ntsb/ATL05CA077.md): Bell 206L 1 · Cherokee, NC · Accident · No injuries · Data collection · Final report · Apr 30, 2005 · N66RR · Substantial damage > 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.md): Bell B-206L-1 · Galliano, LA · Accident · Serious injuries · Data collection · Final report · Mar 13, 2005 · N480RA · Destroyed > 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.md): Agusta A109A · Redwood Valley, CA · Accident · 3 fatal · Field investigation · Final report · Dec 24, 2003 · N25RX · Destroyed > 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 instrument meteorological conditions and a collision with rising… - [NTSB CHI03LA319](https://openairdocs.org/ntsb/CHI03LA319.md): Bell 206L-1 · Shoals, IN · Accident · No injuries · Limited investigation · Final report · Sep 21, 2003 · N74AE · Substantial damage > 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 visual lookout not being possible due to the dust the rotor… - [NTSB CHI03FA056](https://openairdocs.org/ntsb/CHI03FA056.md): Bell 206L-1 · B.S. 53, LA · Accident · 1 fatal · Field investigation · Final report · Jan 16, 2003 · N3194P · Destroyed > The improper approach by the pilot and the settling with power encountered by the pilot. - [NTSB CHI02FA288](https://openairdocs.org/ntsb/CHI02FA288.md): Bell 206L-1 · Doland, SD · Accident · 4 fatal · Field investigation · Final report · Sep 10, 2002 · N400SL · Destroyed > 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 deficiency over areas without lighted references. A factor to… - [NTSB DEN02LA044](https://openairdocs.org/ntsb/DEN02LA044.md): Bell 206L-1 · Salem, UT · Accident · Serious injuries · Limited investigation · Final report · May 18, 2002 · N3894Q · Substantial damage > a loss of tail rotor effectiveness during takeoff. A contributing factor was the wind gusts. - [NTSB ATL02FA048](https://openairdocs.org/ntsb/ATL02FA048.md): Bell 206L-1 · New Smyrna Bch., FL · Accident · 2 fatal · Field investigation · Final report · Feb 16, 2002 · N23PJ · Destroyed > 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.md): Bölkow BO 105 LS · Mud Lake, ID · Accident · Serious injuries · Limited investigation · Final report · Nov 14, 2001 · N93LF · Destroyed > 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.md): Bell 206 L-1 · Seneca Falls, NY · Accident · Serious injuries · Limited investigation · Final report · Mar 23, 2001 · N2138Y · Substantial damage > 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.md): Hiller FH-1100 · Fayette, MS · Accident · No injuries · Limited investigation · Final report · Oct 10, 1998 · N580RH · Substantial damage > 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.md): Bell 206L-1 · Arica, Peru · Accident · 3 fatal · Foreign investigation · Aug 21, 1997 · N2246Q - [NTSB BFO94FA013](https://openairdocs.org/ntsb/BFO94FA013.md): Bell 206L-1 · Portland, ME · Accident · 3 fatal · Field investigation · Final report · Nov 20, 1993 · N911ME · Destroyed > 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 to fuel exhaustion. Factors which contributed to the… - [NTSB FTW93LA081](https://openairdocs.org/ntsb/FTW93LA081.md): Bell 206L-1 · Vermillion 39 · Accident · Minor injuries · Limited investigation · Final report · Feb 8, 1993 · N2244W · Substantial damage > The pilot's failure to maintain proper altitude. - [NTSB LAX88FA330](https://openairdocs.org/ntsb/LAX88FA330.md): Bell 206L-1 · Santa Barbara, CA · Accident · No injuries · Field investigation · Final report · Sep 29, 1988 · N2246Q · Substantial damage > 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 presence of the 1/4 inch steel sheeting. - [NTSB FTW88DRD10](https://openairdocs.org/ntsb/FTW88DRD10.md): Bell 206L-1 · Houma, LA · Accident · No injuries · Final report · Jun 27, 1988 · N2611 · Substantial damage > Shortly after liftoff, the helicopter experienced a power loss at 300 feet. During the emergency landing in a wet swampy area with very high vegetation, the helicopter landed hard, and the main rotor blades struck the tailboom. At a post accident inspection,… - [NTSB CHI88FA079](https://openairdocs.org/ntsb/CHI88FA079.md): Bell 206L-1 · Taylorville, IL · Accident · Serious injuries · Field investigation · Final report · Mar 18, 1988 · N5759H · Destroyed > The helicopter experienced a loss of control while in slow flight out of ground effect. The helicopter impacted the ground in a black plowed field during a period of low visibility due to snow. The occurrence happened in a remote area with few ground… - [NTSB FTW87LA195](https://openairdocs.org/ntsb/FTW87LA195.md): Bell 206L-1 · New Iberia, LA · Accident · No injuries · Limited investigation · Final report · Aug 12, 1987 · N2764F · Substantial damage > Crew performing practice touchdown autorotations during a trng flt. On 4th autorotation, acft touched down with excess grnd speed and skidded for approx 75' on the wet, soft grass. When crew applied power back to flight RPM they heard a grinding sound and… - [NTSB SEA87MA034](https://openairdocs.org/ntsb/SEA87MA034.md): Bell 206L-1 · Pendleton, OR · Accident · 3 fatal · Major investigation · Final report · Dec 4, 1986 · N7EC · Destroyed > The helicopter departed Pendleton on an emerg med svc/med-evac (EMS) flt to transport a patient to portland. After delivering the patient, the plt took off on the rtn flt with 2 med psnl aboard. Drg arrival at 1658 PST, he requested a special VFR (svfr)… - [NTSB LAX85LA092](https://openairdocs.org/ntsb/LAX85LA092.md): Bell 2061-1 · Santa Barbara, CA · Accident · No injuries · Limited investigation · Final report · Jan 3, 1985 · N2246Q · Substantial damage > During takeoff & departure, the helicopter climbed to about 150 ft AGL & started to proceed over water. As it crossed over the shoreline near the end of the rwy, the eng flamed out. The plt turned about 120 deg back toward a Beech area & made an autorotative… - [NTSB LAX83FA420](https://openairdocs.org/ntsb/LAX83FA420.md): Hughes 369HS · Ventura, CA · Accident · 1 fatal · Field investigation · Final report · Sep 4, 1983 · N8500N · Destroyed > The helicopter was observed descending 'straight down' & 'nose first.' The wreckage was located about 200 yds offshore in about 30 ft of water. Witnesses stated that it was dark & hazy. They were able to see the acft lights, but not the stars. The plt did not… - [NTSB FTW82DA144](https://openairdocs.org/ntsb/FTW82DA144.md): Bell 206L-1 · Cameron, LA · Accident · No injuries · Final report · Apr 22, 1982 · N2138Y · Substantial damage > N2138Y departed Cameron, LA after refueling en route to an offshore rig. Shortly after departure, while over water, the aircraft began to yaw and vibrate severely. The pilot stated that the tail rotor pedals "kicked" hard when additional power was applied.… - [NTSB DEN82DA022](https://openairdocs.org/ntsb/DEN82DA022.md): Bell/Textron 206 L-1 · 36 Sw Laramie, WY · Accident · No injuries · Final report · Jan 23, 1982 · N1085T · Substantial damage > After a precautionary landing on a road due to snow, wind and reduced visibility the pilot tookoff when he decided conditions had improved. Shortly after takeoff the visibility worsened and during the execution of a 180 degree turn the pilot stated the engine… - [NTSB FTW81FA082](https://openairdocs.org/ntsb/FTW81FA082.md): Bell 206L-1 · Angleton, TX · Accident · No injuries · Closed · Apr 29, 1981 · N2774V · Substantial damage ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1 WHERE c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03022', '03021')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03022 --- 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.