# NTSB investigations: Allison 250 series, 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 WPR24LA093](https://openairdocs.org/ntsb/WPR24LA093.md): Bell 47G-3B-1 · Garey, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Feb 23, 2024 · N2618W · Substantial damage
  > Maintenance personnel’s failure to properly check the torque paint on a fuel control unit B-nut, which resulted in the loosening of the B-nut, a loss of engine power at a low altitude, and a subsequent impact with terrain.
- [NTSB WPR11LA379](https://openairdocs.org/ntsb/WPR11LA379.md): Bell 47G-3B-2 · Los Banos, CA · Accident · No injuries · Limited investigation · Final report · Aug 14, 2011 · N475AL · Substantial damage
  > The pilot’s inadequate preflight, and contamination of both the engine compressor section and the main rotor blades, which resulted in reduced performance of the engine and rotor system.
- [NTSB LAX94LA054](https://openairdocs.org/ntsb/LAX94LA054.md): Hiller UH-12E · Salinas, CA · Accident · Minor injuries · Limited investigation · Final report · Nov 20, 1993 · N161HA · Substantial damage
  > a fatigue failure of the torsion-tension bar pin due to fretting corrosion. A factor in this accident was an inadequate quality of material utilized in the manufacture of the pin.
- [NTSB LAX85LA305](https://openairdocs.org/ntsb/LAX85LA305.md): Hiller UH-12E · Gonzales, CA · Accident · No injuries · Limited investigation · Final report · Jul 5, 1985 · N161HA · Substantial damage
  > While cruising during an ag flight the acft's eng began losing pwr. At the time the acft was about 50 ft AGL & was travelling at 50 mph. The plt made a forced ldg onto a nearby plowed fld. Upon touchdown the rt skid dug into a furrow & the acft rolled over.…
- [NTSB LAX85LA002](https://openairdocs.org/ntsb/LAX85LA002.md): Hiller UH-12E · Firebaugh, CA · Accident · Minor injuries · Limited investigation · Final report · Oct 5, 1984 · N161HA · Substantial damage
  > The acft collided with terrain while on an aerial application flt. The plt stated he, 'heard a loud bang' while spraying. Then the 'nose of the helicopter dove radically down', and he crashed into the field. Examination of the site revealed that one of the…
- [NTSB LAX84LA428](https://openairdocs.org/ntsb/LAX84LA428.md): Hiller UH-12ET · Delano, CA · Accident · Serious injuries · Limited investigation · Final report · Aug 4, 1984 · N5359V · Substantial damage
  > The Hiller UH-12 helicopter (with a soloy conversion) was on a spray run when the eng began losing power. The plt headed for an 'open spot in the trees', but all power was lost the acft collided with almond trees. Only 15 to 18 ozs of fuel were remaining in…
- [NTSB LAX81DVD28](https://openairdocs.org/ntsb/LAX81DVD28.md): Hiller Acft UH-12E · Orleans, CA · Accident · No injuries · Closed · May 30, 1981 · N62409 · Substantial damage
- [NTSB LAX81DXQ01](https://openairdocs.org/ntsb/LAX81DXQ01.md): Hiller Acft UH-12E · Quincy, CA · Accident · No injuries · Closed · Oct 1, 1980 · N543HA · Substantial damage
- [NTSB LAX80DVG30](https://openairdocs.org/ntsb/LAX80DVG30.md): Hiller UH-12J · Frks Of Salmn, CA · Accident · Minor injuries · Closed · Apr 24, 1980 · N67042 · Destroyed

## 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.engine_model_code IN ('03014', '03019'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03014&state=CA

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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.