NTSB investigations: Allison 250-C28 series
34 cases on aircraft whose registry engine model is Allison 250-C28 series. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.
Cases per year
| 1981 | 1 |
|---|---|
| 1982 | 2 |
| 1983 | 1 |
| 1985 | 1 |
| 1986 | 1 |
| 1987 | 1 |
| 1988 | 3 |
| 1993 | 2 |
| 1997 | 1 |
| 1998 | 1 |
| 2001 | 2 |
| 2002 | 3 |
| 2003 | 3 |
| 2005 | 3 |
| 2006 | 1 |
| 2007 | 1 |
| 2008 | 1 |
| 2009 | 1 |
| 2013 | 1 |
| 2015 | 1 |
| 2023 | 1 |
| 2025 | 1 |
| 2026 | 1 |
Where
Open the mapLatest cases
Query with SQL
duckdb -csv -c "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"Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
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" DESCRun it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
NTSB WPR26LA146Accident · No injuriesClass 4 · LimitedFinal reportBell Helicopter Textron 206L-1 · Chimney Rock, MTThe 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 CEN25FA281Accident · 1 fatalClass 3 · FieldFinal reportBell Helicopter Textron 206L-1 · Thibodaux, LAThe pilot’s failure to maintain clearance to powerlines during an agricultural application pass.NTSB ERA24LA076Accident · No injuriesClass 3 · LimitedFinal reportBell Helicopter Textron 206L-1 · Walland, TNThe 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 ERA15LA138Accident · No injuriesLimited investigationFinal reportBell 206 · Sevierville, TNAn 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 ERA13FA273Accident · 3 fatalField investigationFinal reportBell Helicopter Textron 206L-1 · Manchester, KYThe 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 CEN09LA413Accident · Serious injuriesLimited investigationFinal reportBell Helicopter Textron 206L-1 · Breckenridge, COThe 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 CEN09FA012Accident · 2 fatalField investigationFinal reportBell 206 · Conroe, TXA loss of control for undetermined reasons.NTSB DFW08FA053Accident · 1 fatalField investigationFinal reportBell 206L1 · Venice, LAThe 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 CHI06FA110Accident · 1 fatalField investigationFinal reportMesserschmitt-Bolkow-Blohm BO 105LS A-3 · Green Bay, WIThe 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 LAX05LA155Accident · No injuriesLimited investigationFinal reportBell 206L-1 · Peach Springs, AZa loss of power for undetermined reasons.NTSB ATL05CA077Accident · No injuriesData collectionFinal reportBell 206L 1 · Cherokee, NCThe pilot's improper use of the helicopter flight controls during a hover that resulted in a dynamic rollover.NTSB DFW05CA088Accident · Serious injuriesData collectionFinal reportBell B-206L-1 · Galliano, LAThe 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 LAX04FA076Accident · 3 fatalField investigationFinal reportAgusta A109A · Redwood Valley, CAThe 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 CHI03LA319Accident · No injuriesLimited investigationFinal reportBell 206L-1 · Shoals, INThe 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 CHI03FA056Accident · 1 fatalField investigationFinal reportBell 206L-1 · B.S. 53, LAThe improper approach by the pilot and the settling with power encountered by the pilot.NTSB CHI02FA288Accident · 4 fatalField investigationFinal reportBell 206L-1 · Doland, SDPilot 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 DEN02LA044Accident · Serious injuriesLimited investigationFinal reportBell 206L-1 · Salem, UTa loss of tail rotor effectiveness during takeoff. A contributing factor was the wind gusts.NTSB ATL02FA048Accident · 2 fatalField investigationFinal reportBell 206L-1 · New Smyrna Bch., FLThe 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 SEA02LA014Accident · Serious injuriesLimited investigationFinal reportBölkow BO 105 LS · Mud Lake, IDPilot's failure to maintain adequate separation from terrain during the initial climb. Factors include spatial disorientation and a dark moonless night.NTSB NYC01LA088Accident · Serious injuriesLimited investigationFinal reportBell 206 L-1 · Seneca Falls, NYthe 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 ATL99LA006Accident · No injuriesLimited investigationFinal reportHiller FH-1100 · Fayette, MSThe fuel filter contamination which resulted in the loss of engine power. The air leak in the fuel system was a factor.NTSB FTW97RA323Accident · 3 fatalForeign investigationBell 206L-1 · Arica, PeruNTSB BFO94FA013Accident · 3 fatalField investigationFinal reportBell 206L-1 · Portland, METhe 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 FTW93LA081Accident · Minor injuriesLimited investigationFinal reportBell 206L-1 · Vermillion 39The pilot's failure to maintain proper altitude.NTSB LAX88FA330Accident · No injuriesField investigationFinal reportBell 206L-1 · Santa Barbara, CAFailure 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 FTW88DRD10Accident · No injuriesFinal reportBell 206L-1 · Houma, LAShortly 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 CHI88FA079Accident · Serious injuriesField investigationFinal reportBell 206L-1 · Taylorville, ILThe 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 FTW87LA195Accident · No injuriesLimited investigationFinal reportBell 206L-1 · New Iberia, LACrew 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 SEA87MA034Accident · 3 fatalMajor investigationFinal reportBell 206L-1 · Pendleton, ORThe 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 LAX85LA092Accident · No injuriesLimited investigationFinal reportBell 2061-1 · Santa Barbara, CADuring 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 LAX83FA420Accident · 1 fatalField investigationFinal reportHughes 369HS · Ventura, CAThe 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 FTW82DA144Accident · No injuriesFinal reportBell 206L-1 · Cameron, LAN2138Y 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 DEN82DA022Accident · No injuriesFinal reportBell/Textron 206 L-1 · 36 Sw Laramie, WYAfter 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 FTW81FA082Accident · No injuriesClosedBell 206L-1 · Angleton, TX