# NTSB investigations: Allison 250-C20 series, AZ

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 LAX00LA156](https://openairdocs.org/ntsb/LAX00LA156.md): Bell 407 · Grand Canyon, AZ · Accident · No injuries · Limited investigation · Final report · Apr 16, 2000 · N175PA · Substantial damage
  > The failure and subsequent disintegration of the oil cooler fan forward hanger bearing.
- [NTSB LAX99FA136](https://openairdocs.org/ntsb/LAX99FA136.md): Bell 206B · Grand Canyon, AZ · Accident · 1 fatal · Field investigation · Final report · Apr 1, 1999 · N992UC · Destroyed
  > The failure of the flight crew to properly preflight the helicopter and to detect and remove accumulated snow from the engine inlets and plenum chamber. Factors in the accident were the clouded plenum chamber inspection window and the failure of preceding…
- [NTSB LAX92T#A03](https://openairdocs.org/ntsb/LAX92T%23A03.md): Mcdonnell Douglas 369D · Mesa, AZ · Accident · No injuries · Class 3 · Final report · Feb 14, 1992 · N911FT · Substantial damage
- [NTSB LAX90T#A08](https://openairdocs.org/ntsb/LAX90T%23A08.md): Bell 206B · San Carlos, AZ · Accident · No injuries · Class 3 · Final report · Jul 10, 1990 · N5006Y · Substantial damage
- [NTSB LAX87LA157](https://openairdocs.org/ntsb/LAX87LA157.md): McDonnell Douglas 369E · Phoenix, AZ · Accident · No injuries · Limited investigation · Final report · Mar 19, 1987 · N1601Y · Substantial damage
  > During factory flt training, prior to delivery of the new helicopter to the owner, the CFI said he asked the student to perform a series of emergency procedures which included quick stops from an initial takeoff followed by hovering autorotations. The CFI…
- [NTSB LAX86FA106](https://openairdocs.org/ntsb/LAX86FA106.md): Bell 206B · Young, AZ · Accident · 1 fatal · Field investigation · Final report · Feb 3, 1986 · N3193T · Destroyed
  > The plt & his daughter planned to fly to their ranch for the purpose of hiring a manager. Upon arriving at their destination ground fog prevailed. The plt, familiar with the area, attempted to find an area where he could descend below the fog. The fog was at…
- [NTSB LAX84FA405](https://openairdocs.org/ntsb/LAX84FA405.md): Hughes 369D · Mesa, AZ · Accident · 2 fatal · Field investigation · Final report · Jul 18, 1984 · N58369 · Destroyed
  > The helicopter experienced a main rotor drive system disconnect, an uncontrolled descent & subsequent inflight collision with terrain in a hilly desert area. This was the third & last in a planned series of marketing demo flts conducted for three USMC…

## 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" = 'AZ' 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=AZ

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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.