# NTSB investigations: Allison 250 SER 317HP, 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 LAX85LA045](https://openairdocs.org/ntsb/LAX85LA045.md): Bell 206B · Inverness, CA · Accident · No injuries · Limited investigation · Final report · Nov 10, 1984 · N2917W · Substantial damage
  > An autorotation was initiated at about 300 ft as eng and rotor RPM began to decrease. Touchdown occurred in soft sand with some forward motion. Full aft cyclic was applied causing the main rotor to contact the tailboom. Exam of the acft fuel system revealed…
- [NTSB LAX84FA421](https://openairdocs.org/ntsb/LAX84FA421.md): Fairchild Hiller FH-1100 · Meadview, AZ · Accident · 3 fatal · Field investigation · Final report · Jul 29, 1984 · N711KH · Destroyed
  > Purpose of the flt was s sightseeing tour of lake mead, hoover dam and the western rim of the grand canyon. Before reaching the canyon the flt was to travel over a 5500 ft MSL ridge. The helicopter contacted a juniper tree at the bottom of a 3-sided canyon at…
- [NTSB ANC84LA071](https://openairdocs.org/ntsb/ANC84LA071.md): Bell 206L-1 · Mt Mckinley Vil, AK · Accident · No injuries · Limited investigation · Final report · May 16, 1984 · N1078N · Substantial damage
  > The helicopter experienced an engine failure while cruising at about 600 ft AGL. The pilot made a forced landing during which the main rotor blades collided with trees. Examination of the aircraft fuel system revealed that the check valves located in the fuel…

## 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 ('03011'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03011&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.