# NTSB investigations: Allison 250-C20 series, MT

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 WPR14LA159](https://openairdocs.org/ntsb/WPR14LA159.md): Bell 206B III · Missoula, MT · Accident · Minor injuries · Limited investigation · Final report · Apr 4, 2014 · N43MA · Substantial damage
  > A dynamic rollover during attempted liftoff.
- [NTSB WPR13FA208](https://openairdocs.org/ntsb/WPR13FA208.md): Bell 206B · Shepherd, MT · Accident · 1 fatal · Field investigation · Final report · Apr 27, 2013 · N150SP · Substantial damage
  > The pilot’s loss of control while maneuvering during low-altitude operations due to sudden neurological impairment or incapacitation and the helicopter’s subsequent collision with power lines.
- [NTSB SEA07CA200](https://openairdocs.org/ntsb/SEA07CA200.md): Bell 206B II · Sheep Mountain, MT · Accident · Minor injuries · Data collection · Final report · Jul 16, 2007 · N164JS · Substantial damage
  > The external load net, attached directly to the cargo hook without the use of a long line, oscillated and made contact with the tail rotor system while maneuvering.
- [NTSB SEA07CA069](https://openairdocs.org/ntsb/SEA07CA069.md): Bell 206 B3 · Custer, MT · Accident · No injuries · Data collection · Final report · Mar 5, 2007 · N150SP · Substantial damage
  > The pilot’s failure to maintain clearance between the tail rotor of his helicopter and a piece of farm equipment during the landing sequence.
- [NTSB SEA95GA062](https://openairdocs.org/ntsb/SEA95GA062.md): Bell 206 · Dillon, MT · Accident · No injuries · Final report · Feb 24, 1995 · N2277T · Substantial damage
  > The pilot's selection of a landing site that was not suitable to support the weight of the helicopter. Factors include terrain covered with soft snow.

## 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" = 'MT' 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=MT

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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.