# Final NTSB investigations: Lycoming VO-435-A1F

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 ERA21LA335](https://openairdocs.org/ntsb/ERA21LA335.md): Hummer 260L · Livingston, TN · Accident · No injuries · Class 3 · Limited · Final report · Aug 18, 2021 · N777TC · Substantial damage
  > A total loss of engine power for reasons that could not be determined. Contributing to the accident was the pilot’s operation of the helicopter in a flight regime that would not allow for a successful autorotative landing.
- [NTSB CEN16LA161](https://openairdocs.org/ntsb/CEN16LA161.md): Bell 47G-2A · Los Fresnos, TX · Accident · Serious injuries · Limited investigation · Final report · Apr 21, 2016 · N64702 · Destroyed
  > The pilot's inability to see and avoid the power lines because of trees obscuring his view.
- [NTSB CEN12LA480](https://openairdocs.org/ntsb/CEN12LA480.md): Scotts-Bell 47 47G-2A · Akeley, MN · Accident · Minor injuries · Limited investigation · Final report · Jul 25, 2012 · N73252 · Substantial damage
  > The pilot’s failure to maintain helicopter control during low altitude agricultural operations.
- [NTSB CEN12LA120](https://openairdocs.org/ntsb/CEN12LA120.md): Continental Copters 47G2 · Lohn, TX · Accident · Serious injuries · Limited investigation · Final report · Jan 1, 2012 · N9021R · Substantial damage
  > The improper installation of the tail rotor gearbox by maintenance personnel, which led to accelerated wear of the ring and pinion gears, resulting in the loss of tail rotor effectiveness and subsequent forced landing.
- [NTSB LAX99LA047](https://openairdocs.org/ntsb/LAX99LA047.md): Bell 47G2 · Helendale, CA · Accident · No injuries · Limited investigation · Final report · Dec 12, 1998 · N9021R · Substantial damage
  > The pilot's failure to follow proper procedures to recover from main rotor blade aerodynamic retreating blade stall.
- [NTSB MIA98LA197](https://openairdocs.org/ntsb/MIA98LA197.md): Texas Helicopter OH-13H/M47A · Citronelle, AL · Accident · No injuries · Limited investigation · Final report · Jul 15, 1998 · N1001F · Substantial damage
  > The pilot's failure to control the helicopter's altitude while overflying an area of rising terrain and trees.
- [NTSB LAX97LA285](https://openairdocs.org/ntsb/LAX97LA285.md): Bell 47G2 · Mojave, CA · Accident · No injuries · Limited investigation · Final report · Aug 12, 1997 · N9021R · Substantial damage
  > The student's improper use of the throttle and collective controls and the flight instructor's inadequate supervision of the flight.
- [NTSB MIA91LA141](https://openairdocs.org/ntsb/MIA91LA141.md): Bell 47-G · Aguadilla, PR · Accident · No injuries · Limited investigation · Final report · May 11, 1991 · N955B · Destroyed
  > The improper in flight planning/decision of the pilot-in-command to conduct an out-of-ground-effect hover with a right crosswind. This resulted in an in flight loss of control due to settling with power and in flight collision with terrain.
- [NTSB MIA89LA229](https://openairdocs.org/ntsb/MIA89LA229.md): Bell 47G · Ponce, PR · Accident · No injuries · Limited investigation · Final report · Aug 23, 1989 · N955B · Substantial damage
  > Failure of the aft tail rotor drive shaft.
- [NTSB LAX86LA283](https://openairdocs.org/ntsb/LAX86LA283.md): Texas Helicopter OH-13H/M · Valencia, CA · Accident · Serious injuries · Limited investigation · Final report · Jul 6, 1986 · N51856 · Substantial damage
  > The pilot reported that he heard a loud bang and grinding noise from the engine/main transmission area while on a swath run. He stated that the main rotor RPM decayed immediately after he heard the noise. As the helicopter descended to about 50 feet above the…
- [NTSB ATL81DKW21](https://openairdocs.org/ntsb/ATL81DKW21.md): Texas Hel M-47A · Rickman, TN · Accident · No injuries · Closed · Jul 29, 1981 · N1001F · Substantial damage
- [NTSB LAX81DUQ26](https://openairdocs.org/ntsb/LAX81DUQ26.md): Texas Hel M74A · Rosamond, CA · Accident · No injuries · Closed · Jul 3, 1981 · N51856 · Substantial damage
- [NTSB ANC80FA015](https://openairdocs.org/ntsb/ANC80FA015.md): Bell 47G3B1 · Farewell, AK · Accident · 1 fatal · Closed · Nov 24, 1979 · N73249 · Substantial damage
- [NTSB MIA78FKQ12](https://openairdocs.org/ntsb/MIA78FKQ12.md): Bell 47G3B · Red Lick, MS · Accident · No injuries · Closed · May 28, 1978 · N73249 · Destroyed
- [NTSB NYC75FHJ28](https://openairdocs.org/ntsb/NYC75FHJ28.md): Bell 47G-2A · New York, NY · Accident · Serious injuries · Closed · Feb 27, 1975 · N73252 · Destroyed
- [NTSB SEA74DYG07](https://openairdocs.org/ntsb/SEA74DYG07.md): Bell 47G3B · Orofino, ID · Accident · No injuries · Closed · Aug 1, 1973 · N73249 · Substantial damage
- [NTSB NYC72FHJ01](https://openairdocs.org/ntsb/NYC72FHJ01.md): Bell-Cci 47G2 · Amityville, NY · Accident · No injuries · Closed · Jul 11, 1971 · N9021R · Substantial damage
- [NTSB MKC70F0132](https://openairdocs.org/ntsb/MKC70F0132.md): Bell 47G3B1 · Hemingford, NE · Accident · No injuries · Closed · Aug 4, 1969 · N73249 · Substantial damage
- [NTSB DEN66A0018](https://openairdocs.org/ntsb/DEN66A0018.md): Bell 47G3B · Durango, CO · Accident · Serious injuries · Closed · Sep 1, 1965 · N73249 · Substantial damage
- [NTSB UNK64X1853](https://openairdocs.org/ntsb/UNK64X1853.md): Bell 47G3B · Sheridan, WY · Accident · No injuries · Closed · May 19, 1964 · N73249 · 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."completionStatus" = 'Completed'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('42200'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=42200&status=final

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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.