# NTSB investigations: Allison 250-C20 series, 1991

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 SEA92FA016](https://openairdocs.org/ntsb/SEA92FA016.md): Bell 206B · Salt Lake City, UT · Accident · 1 fatal · Field investigation · Final report · Nov 8, 1991 · N5736B · Destroyed
  > The pilot failed to maintain directional control. Factors to the accident were: inadeqaute remedial action, over confidence in personal ability, and lack of recent expereince.
- [NTSB SEA91TL#02](https://openairdocs.org/ntsb/SEA91TL%2302.md): Hiller-Soloy UH-12E · Vernal, UT · Accident · No injuries · Class 3 · Final report · Sep 18, 1991 · N7173S · Destroyed
- [NTSB SEA91FA184](https://openairdocs.org/ntsb/SEA91FA184.md): Bell 206B · Toutle, WA · Accident · 1 fatal · Field investigation · Final report · Jul 22, 1991 · N276KA · Substantial damage
  > Failure of the pilot to maintain airspeed and correct for the right yawing condition. Factors to the accident were: inadequate compensation for wind conditions, diverted attention, and lack of total expereince in type of aircraft.
- [NTSB LAX91LA289](https://openairdocs.org/ntsb/LAX91LA289.md): Hughes 369D · Napa, CA · Accident · No injuries · Limited investigation · Final report · Jul 5, 1991 · N18KJ · Substantial damage
  > The pilot's failure to maintain the proper altitude. Contributing to the accident was the pilot's improper in flight decision to fly in the below VFR weather conditions and his misjudged weather evaluation.
- [NTSB SEA91FA124](https://openairdocs.org/ntsb/SEA91FA124.md): Bell 206BII · Brewster, WA · Accident · No injuries · Field investigation · Final report · May 28, 1991 · N90307 · Substantial damage
  > The pilot-in-command's selection of unsuitable terrain for the emergency simulation.

## 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 year(c."eventDate") = 1991
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03020&year=1991

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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.