# NTSB investigations: Allison 250-C30 series: Loss of control - in flight 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 NYC08FA071](https://openairdocs.org/ntsb/NYC08FA071.md): Bell 206L-3 · Cherokee, AL · Accident · 3 fatal · Field investigation · Final report · Dec 30, 2007 · N109AE · Substantial damage > The pilot's failure to maintain control of the helicopter during an out-of-ground-effect hover. Contributing to the accident was a loss of tail rotor effectiveness. - [NTSB DFW07LA169](https://openairdocs.org/ntsb/DFW07LA169.md): Bell 206L-3 · High Island 138 · Accident · No injuries · Limited investigation · Final report · Jul 22, 2007 · N330P · Destroyed > The loss of control as result of the pilot's failure to maintain rotor RPM during takeoff. - [NTSB DEN06LA096](https://openairdocs.org/ntsb/DEN06LA096.md): Bell 206L-3 · Taos, NM · Accident · Minor injuries · Limited investigation · Final report · Jul 12, 2006 · N44NM · Substantial damage > the loss of tail rotor effectiveness during landing, and the pilot's delayed remedial action to counteract a right yaw, which resulted in a loss of directional control and collision with terrain. A contributing factor was the pilot's failure to perform… - [NTSB SEA06LA121](https://openairdocs.org/ntsb/SEA06LA121.md): Bell 206L · Vernal, UT · Accident · Minor injuries · Limited investigation · Final report · Jun 15, 2006 · N265SH · Substantial damage > The loss of tail rotor effectiveness during an attempted precationary landing after a takeoff over uneven, sloping, brush-covered terrain. Factors include the pilot using the wrong performance chart while completing his preflight performance calculations, the… - [NTSB CHI05CA156](https://openairdocs.org/ntsb/CHI05CA156.md): Bell 206L-3 · Algonac, MI · Accident · Minor injuries · Data collection · Final report · Jun 24, 2005 · N311JX · Substantial damage > The pilot not maintaining helicopter control, the loss of tail rotor effectiveness he encountered, and his not maintaining clearance from objects during the approach. Factor were the low altitude, the transmission lines, and the garage. - [NTSB FTW01LA176](https://openairdocs.org/ntsb/FTW01LA176.md): Sikorsky SK-76A · New Iberia, LA · Accident · No injuries · Limited investigation · Final report · Jul 10, 2001 · N164AG · Substantial damage > the loss of control while maneuvering for undetermined reasons. - [NTSB FTW98TA328](https://openairdocs.org/ntsb/FTW98TA328.md): Bell 206L-3 · Reklaw, TX · Accident · Minor injuries · Final report · Jul 24, 1998 · N42489 · Substantial damage > The pilot's failure to maintain proper alignment in that the external load was not centered during sling operation, which resulted in entanglement of the load with the landing gear, and the loss of aircraft control. - [NTSB FTW94FA274](https://openairdocs.org/ntsb/FTW94FA274.md): Bell 230 · Albert Lea, MN · Accident · No injuries · Field investigation · Final report · Aug 19, 1994 · N230EM · Substantial damage > The pilot's failure to execute the proper approach and the ensuing settling with power. Factors were the tailwind, and the congestion around the airport. - [NTSB FTW94GA232](https://openairdocs.org/ntsb/FTW94GA232.md): Bell 206L-3 · Mimbres, NM · Accident · 3 fatal · Final report · Jul 12, 1994 · N3178B · Destroyed > The pilot's improper decision to attempt to hover out of ground effect under adverse conditions while exceeding the maximum allowable weight for that maneuver. Factors in the accident were: high density altitude and the tailwind. - [NTSB FTW94LA071](https://openairdocs.org/ntsb/FTW94LA071.md): Bell 206L-3 · Cascade, CO · Accident · No injuries · Limited investigation · Final report · Jan 20, 1994 · N3211K · Substantial damage > The pilot's improper in-flight planning which resulted in the aircraft's yaw performance being exceeded. A factor was the high density altitude. - [NTSB DEN89MA130](https://openairdocs.org/ntsb/DEN89MA130.md): Bell 206L-3 · Big Timber, MT · Accident · 4 fatal · Major investigation · Final report · Jun 2, 1989 · N76KM · Destroyed > Failure of the pilot to maintain control of the aircraft during takeoff, due to spatial disorientation, which resulted in a collision with the terrain. Contributing factors were: dark night, pilot's visual perception, inadequate initial training of the pilot… - [NTSB DEN85LA053](https://openairdocs.org/ntsb/DEN85LA053.md): Bell 206-L3 · Jackson, WY · Accident · Minor injuries · Limited investigation · Final report · Dec 31, 1984 · N3898Y · Substantial damage > Plt had landed on prepared area (snow packed down by heli ski guide) to embark ski passengers. On departure plt lifted to hover, turned to desired hdg and initiated forward transition. As acft passed boundry of packed snow, rotor wash picked up soft loose… - [NTSB DEN84LA093](https://openairdocs.org/ntsb/DEN84LA093.md): Bell 206L-3 · Lake City, CO · Accident · Minor injuries · Limited investigation · Final report · Feb 18, 1984 · N3893U · Substantial damage > The helicopter took off in marginal VMC conditions at close to conditions requiring maximum performance for takeoff. The plt attempted to hover at 90 percent RPM waiting he said 'for a breeze'. The hover stirred up snow causing a whiteout and loss of visual… ## 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 ('03015') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 250)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03015&occurrence=250 --- 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.