# NTSB investigations: Franklin 6V4 series, AL

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 GAA15CA221](https://openairdocs.org/ntsb/GAA15CA221.md): Bell 47D1 · Clanton, AL · Accident · No injuries · Data collection · Final report · Aug 11, 2015 · N74823 · Substantial damage
  > The student pilot's abrupt cyclic and collective inputs during the approach to land which resulted in abnormal runway contact and a subsequent tail boom strike by the main rotor blades.
- [NTSB ERA14LA099](https://openairdocs.org/ntsb/ERA14LA099.md): Bell 47D1 · Pell City, AL · Accident · Minor injuries · Limited investigation · Final report · Jan 21, 2014 · N93067 · Substantial damage
  > The pilot’s use of an improper clutch engagement procedure, which resulted in clutch glazing, slippage, and, ultimately, the in-flight disengagement of the clutch and a loss of rotor rpm. Contributing to the accident were the installation of a light-weight…
- [NTSB ERA13LA308](https://openairdocs.org/ntsb/ERA13LA308.md): Hiller UH-12A · Florence, AL · Accident · Serious injuries · Limited investigation · Final report · Jun 29, 2013 · N6331D · Substantial damage
  > The student pilot’s failure to maintain control of the helicopter while landing, which resulted in a tail rotor ground strike and collision with terrain.
- [NTSB ATL01LA108](https://openairdocs.org/ntsb/ATL01LA108.md): Bell 47G · Berry, AL · Accident · No injuries · Limited investigation · Final report · Sep 7, 2001 · N6327D · Substantial damage
  > The failure of the main rotor system stabilizer damper control horn assembly, resulting in an uncontrolled descent and subsequent collision with a tree and terrain.
- [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 ATL87LA204](https://openairdocs.org/ntsb/ATL87LA204.md): Bell 47D1 · Huntsville, AL · Accident · No injuries · Limited investigation · Final report · Jul 8, 1987 · N908B · Substantial damage
  > The aerial application flight was dispensing insecticides on a cotton field. While maneuvering to avoid powerlines during the procedure turnaround following an upwind swath run, the pilot failed to maintain sufficient airspeed to ensure effective…

## 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" = 'AL' 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 ('27033'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

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

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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.