# NTSB investigations: Allison 250 SER 400HP, 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 CEN26LA181](https://openairdocs.org/ntsb/CEN26LA181.md): Hughes 369HS · Durango, CO · Accident · No injuries · Class 4 · Limited · Final report · May 7, 2026 · N926ES · Substantial damage
  > The flight instructor’s inadequate supervision of the pilot receiving the instruction and the pilot’s improper recovery from a practice autorotation in shifting wind conditions, which resulted in a hard landing.
- [NTSB CEN11FA053](https://openairdocs.org/ntsb/CEN11FA053.md): Bell 206 · Meeker, CO · Accident · 1 fatal · Field investigation · Final report · Nov 3, 2010 · N8533F · Substantial damage
  > The pilot's failure to maintain clearance from electrical power lines during the low-altitude flight.
- [NTSB DEN01LA012](https://openairdocs.org/ntsb/DEN01LA012.md): Bell 206L-1 · Mesa Verde, CO · Accident · No injuries · Limited investigation · Final report · Oct 30, 2000 · N613 · Substantial damage
  > The manufacturer's use of improper materials, and inadequate quality control of the tail rotor blades during the manufacturing process, which resulted in fatigue failure of the blade.
- [NTSB DEN82DA037](https://openairdocs.org/ntsb/DEN82DA037.md): Bell 206B III · Alma, CO · Accident · No injuries · Final report · Mar 1, 1982 · N580P · Substantial damage
  > The pilot reported that before the accident, the flight had been uneventful and all instruments were reading normal except the tot gauge. Reportedly, it was indicating 750 degrees, which was about 100 degrees higher than normal for his power setting of 70%…
- [NTSB DEN80FTE04](https://openairdocs.org/ntsb/DEN80FTE04-128570.md): Hughes 369D · Alma, CO · Accident · No injuries · Closed · Oct 27, 1980 · N58216 · Substantial damage
- [NTSB DEN79FTE19](https://openairdocs.org/ntsb/DEN79FTE19.md): Hughes 500D · Marble, CO · Accident · No injuries · Closed · Jan 21, 1979 · N8306F · 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 ('03013', '03012'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03013&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.