# NTSB investigations: Allison 250 SER 250HP: 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 DFW07LA171](https://openairdocs.org/ntsb/DFW07LA171.md): Bell 206L-1 · Marks, MS · Accident · Serious injuries · Limited investigation · Final report · Jul 28, 2007 · N90AE · Destroyed
  > The loss of control and hard landing as result of the loss of tail rotor effectiveness. A contributing factor was the prevailing dark night conditions.
- [NTSB LAX06LA220](https://openairdocs.org/ntsb/LAX06LA220.md): Bell 206B · Chino Hills, CA · Accident · Minor injuries · Limited investigation · Final report · Jun 28, 2006 · N205LA · Substantial damage
  > A loss of aircraft control for undetermined reasons.
- [NTSB CHI05LA218](https://openairdocs.org/ntsb/CHI05LA218.md): Enstrom 480 · Goshen, IN · Accident · Serious injuries · Limited investigation · Final report · Aug 5, 2005 · N480FX · Substantial damage
  > Ground resonance experienced by the pilots.
- [NTSB ATL04TA137](https://openairdocs.org/ntsb/ATL04TA137.md): Bell 206B · Graysville, AL · Accident · No injuries · Final report · Jun 22, 2004 · N3902W · Destroyed
  > The pilot's inadequate compensation for a tailwind and his failure to maintain directional control resulting in a loss of tail rotor effectiveness. A factor was the pilot's improper in-flight decision to hover with a tailwind.
- [NTSB IAD03LA015](https://openairdocs.org/ntsb/IAD03LA015.md): Bell 206L1 · Albany, KY · Accident · No injuries · Limited investigation · Final report · Nov 8, 2002 · N108AE · Substantial damage
  > The pilot's inadequate in-flight planning, which resulted in an angle of approach in relative wind conditions conducive to a loss of helicopter tail rotor effectiveness. A factor was the obstacles surrounding the landing field.
- [NTSB LAX01LA013](https://openairdocs.org/ntsb/LAX01LA013.md): Bell 206L-1 · Grand Canyon, AZ · Accident · Minor injuries · Limited investigation · Final report · Oct 14, 2000 · N2233F · Substantial damage
  > The pilot's in-flight loss of control during liftoff due to his improper planning and decisions. Related factors were the high density altitude and helicopter weight condition, and the lack of a suitable takeoff area.
- [NTSB CHI99LA298](https://openairdocs.org/ntsb/CHI99LA298.md): Bell 206L · Cape Girardeau, MO · Accident · No injuries · Limited investigation · Final report · Aug 10, 1999 · N810F · Substantial damage
  > The inadequate preflight planning/preparation by the pilot, in that the auxiliary power unit cord was not removed. The brick wall was a contributing factor.
- [NTSB NYC99FA140](https://openairdocs.org/ntsb/NYC99FA140.md): Sikorsky S-76A · Jackson, KY · Accident · 4 fatal · Field investigation · Final report · Jun 15, 1999 · N2743E · Destroyed
  > the failure of the PIC to adequately supervise the SIC, and maintain a positive climb. Factors were the fog and dark night.
- [NTSB IAD97FA123](https://openairdocs.org/ntsb/IAD97FA123.md): Fairchild Hiller FH-1100 · Pittsfield, MA · Accident · 1 fatal · Field investigation · Final report · Sep 27, 1997 · N5045F · Destroyed
  > The first pilot's improper procedures for an autorotation, and improper flare which resulted in a hard landing. Also causal was the second pilot's inadequate remedial action.
- [NTSB SEA97LA029](https://openairdocs.org/ntsb/SEA97LA029.md): Bell 206B3 · Ballston, OR · Accident · Serious injuries · Limited investigation · Final report · Nov 19, 1996 · N921RB · Substantial damage
  > a loss of control for undetermined reasons.
- [NTSB LAX95LA310](https://openairdocs.org/ntsb/LAX95LA310.md): Bell 206BIII · Carmel Valley, CA · Accident · No injuries · Limited investigation · Final report · Aug 28, 1995 · N206MT · Substantial damage
  > the pilot's failure to maintain an adequate clearance from obstructions while hovering.
- [NTSB DEN93LA060](https://openairdocs.org/ntsb/DEN93LA060.md): Bell 206L-1 · Mead, CO · Accident · Minor injuries · Limited investigation · Final report · May 16, 1993 · N38Q · Substantial damage
  > A failure by the pilot in command to compensate for wind conditions and maintain control of the helicopter. A factor was: unfavorable wind conditions.
- [NTSB NYC90LA072](https://openairdocs.org/ntsb/NYC90LA072.md): Bell 206B · Norwood, MA · Accident · Minor injuries · Limited investigation · Final report · Feb 22, 1990 · N41AA · Substantial damage
  > Improper planning/decision by the pilot. The turbulence was a related factor.
- [NTSB BFO87LA047](https://openairdocs.org/ntsb/BFO87LA047.md): Hiller FH-1100 · Capron, VA · Accident · Minor injuries · Limited investigation · Final report · Jul 15, 1987 · N590FH · Substantial damage
  > The plt made a 60 mph power descent landing apch. When the helicopter descended to a height of about 10 ft AGL, the plt raised collective and applied left rudder pressure. The helicopter abruptly turned right. According to the plt, the helicopter did not…
- [NTSB MIA87LA133](https://openairdocs.org/ntsb/MIA87LA133.md): Bell 206L · Miami, FL · Accident · Minor injuries · Limited investigation · Final report · Apr 12, 1987 · N16780 · Substantial damage
  > Unlicensed pilot lost control of helicopter while in hover while attempting to steal the helicopter. The aircraft crashed to earth and rolled over. The pilot was on probation for attempting to steal a helicopter on a previous occasion. The plt received minor…
- [NTSB LAX86LA226](https://openairdocs.org/ntsb/LAX86LA226.md): Bell 206B · Los Angeles, CA · Accident · Minor injuries · Limited investigation · Final report · May 21, 1986 · N1411W · Substantial damage
  > During a x-wind takeoff the downwind skid contacted the landing pad and the helicopter rolled over to the right. One person on the ground was injured by flying debris.
- [NTSB DEN86LA007](https://openairdocs.org/ntsb/DEN86LA007.md): Bell BH 206BII · Kremmling, CO · Accident · Serious injuries · Limited investigation · Final report · Oct 10, 1985 · N1959G · Substantial damage
  > While maneuvering to observe wildlife, the pilot attempted to hover out of gnd effect in steep mtns terrain at 9800 ft MSL at 2550 lbs gw with a 7-10KT tailwind. According to acft hoge charts in the POH, the acft was not capable of hoge in the conditions of…
- [NTSB DEN83LA200](https://openairdocs.org/ntsb/DEN83LA200.md): Bell 206L-1 · Tucker, UT · Accident · Serious injuries · Limited investigation · Final report · Aug 26, 1983 · N3900B · Substantial damage
  > The helicopter was being used on a seismic data acquistion operation. While landing by a road in mountainous terrain at an elevation of aprx 8400 ft, the helicopter was observed to approach to a hover over the roadway. A considerable amount of dust was blown…
- [NTSB FTW83LA132](https://openairdocs.org/ntsb/FTW83LA132.md): Bell 206L-1 · Shipshoal 295 · Accident · Serious injuries · Limited investigation · Final report · Mar 1, 1983 · N1076S · Substantial damage
  > Reportedly, the winds were variable a 2 to 4 KTS as the plt began his approach to an off-shore oil rig. He stated that he chose to terminate the landing from a 4 ft hover. At aprx 15 ft above & 5 ft short of the helipad, the helicopter began to drop at an…

## 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 ('03002', '03003')
    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=03002&occurrence=250

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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.