# NTSB investigations: Franklin 6V4 series, 1994

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 ATL94LA172](https://openairdocs.org/ntsb/ATL94LA172.md): Bell 47D1 Wasp · Hazel Green, AL · Accident · No injuries · Limited investigation · Final report · Sep 13, 1994 · N908B · Substantial damage
  > Undetermined.
- [NTSB FTW94LA221](https://openairdocs.org/ntsb/FTW94LA221.md): Bell OH-13E · Mountain View, AR · Accident · No injuries · Limited investigation · Final report · Jul 3, 1994 · N39WL · Substantial damage
  > The fuel exhaustion as result of a struck fuel drain valve. Factors were the high density altitude, and the unsuitable terrain at the pilot's disposal for the forced landing.
- [NTSB FTW94LA193](https://openairdocs.org/ntsb/FTW94LA193.md): Bell 47H-1 · Tulsa, OK · Accident · No injuries · Limited investigation · Final report · Jun 4, 1994 · N2831B · Substantial damage
  > The pilot's failure to maintain rotor RPM, his delayed landing flare, and the improper touchdown.
- [NTSB FTW94LA166](https://openairdocs.org/ntsb/FTW94LA166.md): Bell 47G · Sulphur, OK · Accident · No injuries · Limited investigation · Final report · May 18, 1994 · N933B · Substantial damage
  > The loss of engine power due to the failure of an engine accessory oil pump gear. A factor was the lack of suitable terrain for the autorotation.
- [NTSB MIA94FA125](https://openairdocs.org/ntsb/MIA94FA125.md): Bell 47D1 · Marathon, FL · Accident · 2 fatal · Field investigation · Final report · Apr 22, 1994 · N9660 · Destroyed
  > Separation of the tail rotor gearbox and tail rotor blades for an undetermined reason. Factors related to the accident were: failure of maintenance personnel to follow the proper maintenance procedure after a previous tail rotor strike, and failure to conduct…

## 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") = 1994
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27033'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27033&year=1994

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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.