# NTSB investigations: Allison 250-C20 series, 1984

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 SEA85LA031](https://openairdocs.org/ntsb/SEA85LA031.md): Hiller UH-12ET · Hoquiam, WA · Accident · Minor injuries · Limited investigation · Final report · Dec 18, 1984 · N100LM · Substantial damage
  > Plt reported that while in normal cruise flight, a total loss of power occurred. Autorotation was effected in mountainous, wooded terrain. Examination of the engine showed continuity and freedom of rotation. Examination of the fuel system disclosed no…
- [NTSB SEA85LA020](https://openairdocs.org/ntsb/SEA85LA020.md): Hughes 369D · Kings Valley, OR · Accident · Minor injuries · Limited investigation · Final report · Nov 16, 1984 · N58256 · Destroyed
  > The plt attempted to fly the acft away from the site of a proposed load drop before the drop was completed. The FAA inspectors said the sling did not release properly. When the plt attempted to depart the area the acft struck the groundin a nose low attitude.…
- [NTSB LAX85FA036](https://openairdocs.org/ntsb/LAX85FA036.md): Bell 206B · Beaumont, CA · Accident · 2 fatal · Field investigation · Final report · Oct 31, 1984 · N20DB · Destroyed
  > Approximately one min before the accident the pilot contacted the tower at norton air force base for clearance through their traffic area. He reported initially that he was at 300 ft AGL. Seconds later he transmitted that he was at 100 ft over the freeway.…
- [NTSB FTW84LA314](https://openairdocs.org/ntsb/FTW84LA314.md): Aerospatiale AS-355F · El Paso, TX · Accident · No injuries · Limited investigation · Final report · Jul 20, 1984 · N240US · Substantial damage
  > The helicopter encountered turbulence and downdrafts during landing. The acft impacted the asphalt ramp slightly nose low and bounced 2-3 ft into the air. The nose dipped more and full aft cyclic was applied. The main rotor blades hit the ground and the acft…
- [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…
- [NTSB SEA84LA134](https://openairdocs.org/ntsb/SEA84LA134.md): Hughes 369D · Wrangell, AK · Accident · No injuries · Limited investigation · Final report · Jun 16, 1984 · N5133U · Substantial damage
  > The helicopter was parked with the eng running when it was struck by another acft, a Beech C-45G. Prior to the collision, the helicopter was at a low RPM; therefore, the plt was unable to move the helicopter out of the way. The Beech acft was being taxied…
- [NTSB FTW84LA270](https://openairdocs.org/ntsb/FTW84LA270.md): Bell 206B · South Pelto · Accident · Minor injuries · Limited investigation · Final report · Jun 8, 1984 · N2276Q · Substantial damage
  > While cruising at 550 ft above the gulf of Mexico, the plt noted hi tot indications, followed by loss of N1 RPM & eng failure. An autorotation was initiated which terminated in a hard landing in 5 ft waves. One emergency float separated during the 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 year(c."eventDate") = 1984
  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&year=1984

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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.