# NTSB investigations: Allison 250-C20 series, WY

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 SEA08LA213](https://openairdocs.org/ntsb/SEA08LA213.md): Bell 206B · Woods Landing-Jelm, WY · Accident · Serious injuries · Limited investigation · Final report · Sep 27, 2008 · N59611 · Substantial damage
  > The pilot's encounter with a loss of tail rotor effectiveness event and his failure to maintain directional control while maneuvering. Contributing to the accident were the tailwind condition and the sloping, uneven terrain.
- [NTSB DEN06LA080](https://openairdocs.org/ntsb/DEN06LA080.md): Garlick Helicopters OH- 58C · Muddy Gap, WY · Accident · No injuries · Limited investigation · Final report · May 30, 2006 · N16JD · Substantial damage
  > the loss of engine power for reasons undetermined. Contributing to the accident was the low altitude and rough uneven terrain.
- [NTSB DEN03LA092](https://openairdocs.org/ntsb/DEN03LA092.md): Hiller UH-12E · Cheyenne, WY · Accident · No injuries · Limited investigation · Final report · May 30, 2003 · N508SQ · Substantial damage
  > the pilot's failure to maintain aircraft control. A contributing to the accident was the sudden tailwind encountered.
- [NTSB DEN81FA062](https://openairdocs.org/ntsb/DEN81FA062.md): Hughes 369D · Afton, WY · Accident · Minor injuries · Closed · Aug 27, 1981 · N58256 · Substantial damage
- [NTSB DEN81FA022](https://openairdocs.org/ntsb/DEN81FA022.md): Bell 206A · Evanston, WY · Accident · No injuries · Closed · Mar 16, 1981 · N7881S · 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."eventStateOrRegion" = 'WY' AND c."eventCountry" = 'USA'
  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&state=WY

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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.