# NTSB investigations: Dehavilland DHC-6 TWIN OTTER, CA

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 LAX92MA183](https://openairdocs.org/ntsb/LAX92MA183.md): de Havilland DHC-6-200 · Perris, CA · Accident · 16 fatal · Major investigation · Final report · Apr 22, 1992 · N141PV · Destroyed
  > The pilot-in-command's inadvertent feathering of the wrong propeller following an engine power loss, and the failure of the operator to assure that the pilot was provided with adequate training in the airplane. Factors related to the accident were: water…
- [NTSB LAX91FA052](https://openairdocs.org/ntsb/LAX91FA052.md): de Havilland DHC-6-100 · Perris Valley, CA · Accident · Minor injuries · Field investigation · Final report · Dec 9, 1990 · N121PM · Substantial damage
  > A loss of power on the left engine due to a fatigue failure of a compressor turbine blade leading to further compressor blade damage; a worn power turbine governor throttle cam assembly which led to loss of power on the right engine; and inadequate…
- [NTSB LAX90LA298](https://openairdocs.org/ntsb/LAX90LA298.md): Bell 206B · California City, CA · Accident · No injuries · Limited investigation · Final report · Aug 22, 1990 · N250CA · 2 aircraft · Substantial damage
  > The failure of the helicopter pilot to maintain adequate clearance from the jump aircraft. A factor in the accident was the inability of the jump aircraft pilot to maintain visual contact with the helicopter.
- [NTSB LAX87FA290](https://openairdocs.org/ntsb/LAX87FA290.md): de Havilland DHC-6 · Palmdale, CA · Accident · No injuries · Field investigation · Final report · Aug 4, 1987 · N931MA · 2 aircraft · Substantial damage
  > A Dehavilland DHC-6, N931MA, operating as transworld express flt 7591 (twe 7591) & a Cessna 172N, N737EV, collided abt 10 miles west/southwest of Palmdale, CA at abt 5500 ft MSL. Twe 7591 was descending on a 355 deg mag heading; N737EV was level and was…
- [NTSB LAX77FA017](https://openairdocs.org/ntsb/LAX77FA017.md): Dehavilland DHC-6 · Los Angeles, CA · Accident · No injuries · Closed · Dec 29, 1976 · N66191 · 2 aircraft · Substantial damage
- [NTSB OAK70A0025](https://openairdocs.org/ntsb/OAK70A0025.md): Dehavilland DHC-6 · Oakland, CA · Accident · No injuries · Closed · Oct 1, 1969 · N66180 · Substantial damage
- [NTSB LAX69A0026](https://openairdocs.org/ntsb/LAX69A0026.md): Dehavilland DHC-6 · Avalon, CA · Accident · No injuries · Closed · Nov 12, 1968 · N64150 · 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" = 'CA' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('2802606'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=2802606&state=CA

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