# Fatal NTSB investigations: Franklin 6V4 series

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 CHI01FA231](https://openairdocs.org/ntsb/CHI01FA231.md): World Helicopters 47D1 · Ballard, MO · Accident · 2 fatal · Field investigation · Final report · Jul 22, 2001 · N17301 · Destroyed
  > The pilot's improper preflight planning which resulted in fuel exhaustion, and the pilot's subsequent improper autorotation.
- [NTSB MIA97FA248](https://openairdocs.org/ntsb/MIA97FA248.md): Bell 47G · Saluda, SC · Accident · 2 fatal · Field investigation · Final report · Sep 19, 1997 · N70747 · Destroyed
  > in-flight collision with a tree, for undetermined reason(s).
- [NTSB LAX96FA045](https://openairdocs.org/ntsb/LAX96FA045.md): Bell 47D1 · Shafter, CA · Accident · 2 fatal · Field investigation · Final report · Nov 12, 1995 · N78900 · Destroyed
  > the pilot misjudged the altitude and ground clearance while performing an unwarranted low altitude flight maneuver.
- [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…
- [NTSB NYC90DGM02](https://openairdocs.org/ntsb/NYC90DGM02.md): Bell 47D1 · Meadville, PA · Accident · 1 fatal · Final report · Jun 22, 1990 · N310A · Destroyed
  > The pilot's failure to see and avoid the power lines.
- [NTSB MKC88FA054](https://openairdocs.org/ntsb/MKC88FA054.md): Bell 47D1 · Nixa, MO · Accident · 1 fatal · Field investigation · Final report · Feb 21, 1988 · N7735 · Destroyed
  > During the process of moving the helicopter from the hangar the right skid slipped off the concrete helipad and became stuck in the mud. The pilot attempted to dislodge the skid by bringing the aircraft to a hover. The left skid became airborne and contacted…
- [NTSB ATL86FEI07](https://openairdocs.org/ntsb/ATL86FEI07.md): Bell 47G2 · Lisbon, OH · Accident · 1 fatal · Final report · Jun 26, 1986 · N984B · Minor damage
  > The aerial application helicopter was being serviced by a chemical truck that was parked adjacent to the acft. The acft engine was at high idle with the main rotor turning at 250 RPM. The ground crewman jumped off the side of the chemical truck into the main…
- [NTSB MIA84FA058](https://openairdocs.org/ntsb/MIA84FA058.md): Hiller UH-12C · San Juan, PR · Accident · 1 fatal · Field investigation · Final report · Jan 12, 1984 · N5317V · No damage
  > A performer fell from a trapeze rigged below the helicopter while it was hovering at about 150 ft AGL. The FAA had not authorized the modification to the acft. The plt was not certified for external load operations. The performer reportedly had not done this…
- [NTSB CHI80FEC26](https://openairdocs.org/ntsb/CHI80FEC26.md): Bell 47D1 · Munith, MI · Accident · 1 fatal · Closed · Jul 30, 1980 · N3656F · Substantial damage
- [NTSB FTW80FPM14](https://openairdocs.org/ntsb/FTW80FPM14.md): Bell 47G · Calvin, OK · Accident · 1 fatal · Closed · Jul 16, 1980 · N16657 · Destroyed
- [NTSB ANC76DAH16](https://openairdocs.org/ntsb/ANC76DAH16.md): Bell 47D-1 · Birchwood, AK · Accident · 1 fatal · Closed · May 25, 1976 · N117B · Substantial damage
- [NTSB NYC69F0450](https://openairdocs.org/ntsb/NYC69F0450.md): Bell 47G · Geneseo, NY · Accident · 1 fatal · Closed · May 5, 1969 · N1273 · Destroyed
- [NTSB OAK67A0071](https://openairdocs.org/ntsb/OAK67A0071.md): Bell 47D1 · Martinez, CA · Accident · 3 fatal · Closed · Mar 25, 1967 · N74123 · Destroyed

## 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."highestInjuryLevel" = 'Fatal'
  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&fatal=1

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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.