# NTSB investigations: Franklin 6VS-335 series, TX

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 FTW94LA147](https://openairdocs.org/ntsb/FTW94LA147.md): Hiller UH-12B · Crystal Beach, TX · Accident · No injuries · Limited investigation · Final report · May 8, 1994 · N6417V · Substantial damage
  > The pilot's improper autorotation touchdown, which rsulted in the hard landing. A factor was the power loss due to water contaminated fuel.
- [NTSB FTW94LA125](https://openairdocs.org/ntsb/FTW94LA125.md): Hiller UH-12 · Alvin, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 16, 1994 · N41319 · Substantial damage
  > The pilot's failure to maintain rotor speed, delay of the flare, and the improper touchdown. A factor was the loss of engine power for undetermined reasons.
- [NTSB FTW91LA007](https://openairdocs.org/ntsb/FTW91LA007.md): Bell 47G · Grand Prairie, TX · Accident · No injuries · Limited investigation · Final report · Oct 20, 1990 · N1071Z · Substantial damage
  > The pilot's inadequate compensation for the existing tailwind conditions and his failure to maintain rotor RPM.
- [NTSB FTW84LA099](https://openairdocs.org/ntsb/FTW84LA099.md): Hiller UH-12C · Imperial, TX · Accident · No injuries · Limited investigation · Final report · Dec 16, 1983 · N63MC · Substantial damage
  > The plt reported that when he was in cruise flt at 300 ft AGL, a sudden violent shudder went thru the whole helicopter, then the shudder stopped. He noted no change in the flit characteristics or eng power. The plt elected to make a precautionary landing by…
- [NTSB FTW81FPD31](https://openairdocs.org/ntsb/FTW81FPD31.md): Hiller Acft UH-12C · Burleson, TX · Accident · No injuries · Closed · Jul 15, 1981 · N57CR · 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" = 'TX' 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 ('27040'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27040&state=TX

---
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.