# NTSB investigations: Franklin 6V4 series: Loss of control - in flight

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 LAX95LA326](https://openairdocs.org/ntsb/LAX95LA326.md): Hiller UH-12C · Porterville, CA · Accident · Minor injuries · Limited investigation · Final report · Sep 6, 1995 · N1348Z · Substantial damage
  > the flight instructor's inadequate supervision of the flight; the dual student's improper use of the flight controls; and improper remedial action.
- [NTSB LAX95LA238](https://openairdocs.org/ntsb/LAX95LA238.md): Hiller UH-12C · Rio Vista, CA · Accident · No injuries · Limited investigation · Final report · Jul 3, 1995 · N1348Z · Substantial damage
  > The result of a chafing failure of the left anti-torque control cable while the aircraft was in flight. An inadequate preflight inspection by the pilot-in-command, and an inadequate 100-hour inspection by company maintenance personnel were factors in this…
- [NTSB ATL90DLQ01](https://openairdocs.org/ntsb/ATL90DLQ01.md): Bell 47D1 · Hickman, KY · Accident · No injuries · Final report · Apr 24, 1990 · N2134 · Substantial damage
  > Improper in-flight planning/decision by the pilot. The resultant tailwind was a related factor.
- [NTSB MIA90LA023](https://openairdocs.org/ntsb/MIA90LA023.md): Bell 47D1 · Loxahatchee, FL · Accident · Serious injuries · Limited investigation · Final report · Nov 2, 1989 · N93067 · Substantial damage
  > Failure of the pilot to maintain rotor RPM after pulling up from a swath run. A related factor was the presence of trees.
- [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 SEA87LA172](https://openairdocs.org/ntsb/SEA87LA172.md): Bell 47G2 · Grandview, WA · Accident · Serious injuries · Limited investigation · Final report · Aug 21, 1987 · N74161 · Substantial damage
  > After the completion of spray operations the pilot was attempting to place the helicopter onto a trailer. The pilot misjudged his position, over-corrected, and then lost control of the helicopter, striking the ground.
- [NTSB CHI84LA184](https://openairdocs.org/ntsb/CHI84LA184.md): Bell 47D1 · Alpena, MI · Accident · Serious injuries · Limited investigation · Final report · May 20, 1984 · N9158R · Destroyed
  > Prior to the accident, the owner/plt of the helicopter reportedly 'buzzed' a local baseball game. Shortly after that, the helicopter was observed to maneuver over a wooded area, enter a nose high attitude, then roll or bank & enter a descent into a wooded…
- [NTSB CHI82DA176](https://openairdocs.org/ntsb/CHI82DA176.md): Bell 47G-1 · Cincinnati, OH · Accident · Minor injuries · Final report · May 20, 1982 · N141B · Substantial damage
  > The fore and aft cyclic control linkage tube became disconnected in flight. An emergency descent, using collective "s" turns to reduce airspeed was performed. The pilot intentionally collided with trees during the forced landing to cushion the fall.…

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27033')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 250))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27033&occurrence=250

---
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.