# NTSB investigations: Allison 250-C20 series, OK

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 CEN14CA525](https://openairdocs.org/ntsb/CEN14CA525.md): Bell 206B · Nashoba, OK · Accident · No injuries · Data collection · Final report · Sep 25, 2014 · N152CA · Substantial damage
  > The pilot's loss of directional control due a loss of tail rotor effectiveness.
- [NTSB CEN11CA509](https://openairdocs.org/ntsb/CEN11CA509.md): Bell 206B · Temple, OK · Accident · No injuries · Data collection · Final report · Jul 23, 2011 · N118TV · Substantial damage
  > The pilot’s failure to maintain clearance from static power lines.
- [NTSB DFW06CA112](https://openairdocs.org/ntsb/DFW06CA112.md): Bell 206B · Vinita, OK · Accident · No injuries · Data collection · Final report · May 2, 2006 · N342WC · Substantial damage
  > The pilot's improper pre-flight planning, which resulted in a total loss of engine power due to fuel exhaustion. A contributing factor was the lack of suitable terrain for the forced landing.

## 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" = 'OK' 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=OK

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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.