# NTSB investigations: Allison 250 SER 250HP, CO

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 CEN23LA048](https://openairdocs.org/ntsb/CEN23LA048.md): Hughes 369HS · Oxford, CO · Accident · No injuries · Class 4 · Limited · Final report · Nov 23, 2022 · N668M · Substantial damage
  > The designated pilot examiner’s failure to maintain a proper descent during a practice 180° autorotation which resulted in a hard landing.
- [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 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 DEN84FA142](https://openairdocs.org/ntsb/DEN84FA142.md): Hughes 369D · Meeker, CO · Accident · Serious injuries · Field investigation · Final report · May 2, 1984 · N1090A · Substantial damage
  > During slow (35-40 KTS) cruise flt at about 50 ft AGL in mountainous terrain for wildlife survey, pwr loss occurred. Auto systems briefly restored pwr, followed by a ttl loss. Plt executed emergency autorotation into trees on sloping terrain. Investigation…
- [NTSB DEN84FA038](https://openairdocs.org/ntsb/DEN84FA038.md): Bell 206B · Ft. Morgan, CO · Accident · Serious injuries · Field investigation · Final report · Dec 3, 1983 · N1078V · Substantial damage
  > The helicopter was owned & operated by a tv station & was being used for transportation to a news event. While en route, clouds & reduced visibility due to fog were encountered. The plt elected to land in a field covered with powdered snow. During the…
- [NTSB DEN74FTE42](https://openairdocs.org/ntsb/DEN74FTE42.md): Hiller Acft FH1100 · Aspen, CO · Accident · No injuries · Closed · Mar 13, 1974 · N748FH · 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" = 'CO' 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 ('03002', '03003'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03002&state=CO

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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.