# NTSB investigations: Lycoming VO-435 series: Loss of engine power

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 ATL07LA052](https://openairdocs.org/ntsb/ATL07LA052.md): Bell 47G2A · Huntsville, AL · Accident · Minor injuries · Limited investigation · Final report · Mar 17, 2007 · N471KC · Destroyed
  > The loss of engine power due to undetermined reasons.
- [NTSB CHI04CA229](https://openairdocs.org/ntsb/CHI04CA229.md): Bell 47G2 · Muncie, IN · Accident · No injuries · Data collection · Final report · Aug 14, 2004 · N96MB · Destroyed
  > The engine failure for an undetermined reason, and the pilot's inability to properly level-off for landing due to the low rotor speed, which resulted in the hard landing. The low altitude where the engine failure occurred was a factor.
- [NTSB CHI03LA184](https://openairdocs.org/ntsb/CHI03LA184.md): Bell 47G-5A · Sandusky, MI · Accident · No injuries · Limited investigation · Final report · Jun 28, 2003 · N8413D · Substantial damage
  > The failure of the ignition switch leading to an engine power loss in cruise flight and the subsequent high flare during autorotation. Factors contributing to the accident were the pilot's misjudgment of the landing flare and the unsuitable terrain…
- [NTSB ATL03LA007](https://openairdocs.org/ntsb/ATL03LA007.md): Bell 47G3B1 · Highfalls, GA · Accident · No injuries · Limited investigation · Final report · Oct 19, 2002 · N4002G · Substantial damage
  > The pilots inadequate fuel management, and subsequent loss of engine power due to fuel exhaustion, and a in-flight collision with trees during an autorotation. A factor was the pilot's failure to insure that the required equipment (fuel gauge) was installed…
- [NTSB FTW02LA216](https://openairdocs.org/ntsb/FTW02LA216.md): Bell TH-13T · New Iberia, LA · Accident · No injuries · Limited investigation · Final report · Jul 18, 2002 · N99628 · Substantial damage
  > The loss of engine power for undetermined reasons. High vegetation was a factor.
- [NTSB CHI02LA163](https://openairdocs.org/ntsb/CHI02LA163.md): Bell 47G-2A-1 · Jordan, MN · Accident · Minor injuries · Limited investigation · Final report · Jun 11, 2002 · N8542D · Substantial damage
  > The loss of engine power due to improper maintenance by unknown maintenance personnel which led to a misalignment of the gearbox casing.
- [NTSB CHI01LA259](https://openairdocs.org/ntsb/CHI01LA259.md): Bell 47G-2 · Blooming Prairi, MN · Accident · No injuries · Limited investigation · Final report · Aug 5, 2001 · N440TG · Substantial damage
  > The reported loss of engine power for undetermined reasons during a the cruise portion of a CFR part 137 observation, and the pilot not following the height/velocity charts data.
- [NTSB ATL01LA075](https://openairdocs.org/ntsb/ATL01LA075.md): Bell 47 · Indianola, MS · Accident · No injuries · Limited investigation · Final report · Jul 10, 2001 · N8478D · Substantial damage
  > The pilot's improper use of flight controls during an autorotation that resulted inn the collapse of the skids and cross tube assembly. A factor was the loss of engine power due to the failure of # 1 connecting rod and the overload failure of the skids and…
- [NTSB SEA99LA149](https://openairdocs.org/ntsb/SEA99LA149.md): Bell 47G-2 · Benton City, WA · Accident · 1 fatal · Limited investigation · Final report · Aug 26, 1999 · N11VH · Destroyed
  > A loss of power for undetermined reasons and the failure of the pilot to maintain adequate rotor RPM following the power loss. Contributing factors were the pilot's lack of certification and total experience.
- [NTSB CHI98LA292](https://openairdocs.org/ntsb/CHI98LA292.md): Bell M74L · Grand Forks, ND · Accident · No injuries · Limited investigation · Final report · Jul 31, 1998 · N1001N · Substantial damage
  > The worn rotor clutch shoes, and subsequent loss of main rotor rpm.
- [NTSB MIA98LA154](https://openairdocs.org/ntsb/MIA98LA154.md): Bell 47G-2 · Fort Walton Bch, FL · Accident · Minor injuries · Limited investigation · Final report · May 9, 1998 · N6714D · Substantial damage
  > The loss of engine power for undetermined reasons.
- [NTSB LAX98LA001](https://openairdocs.org/ntsb/LAX98LA001.md): Bell 47G-2 · Burbank, CA · Accident · No injuries · Limited investigation · Final report · Oct 3, 1997 · N2483B · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB FTW96LA121](https://openairdocs.org/ntsb/FTW96LA121.md): Hiller UH-12D · Carrizo Springs, TX · Accident · No injuries · Limited investigation · Final report · Feb 16, 1996 · N67065 · Substantial damage
  > a loss of engine power for undetermined reasons, and the pilot's improper touchdown.
- [NTSB MIA89LA240](https://openairdocs.org/ntsb/MIA89LA240.md): Bell 47G-2 · Cayey, PR · Accident · No injuries · Limited investigation · Final report · Sep 3, 1989 · N37870 · Substantial damage
  > Loss of engine power for an unknown reason. A factor related to the accident was: the presence of trees in the emergency landing area.
- [NTSB NYC86LA191](https://openairdocs.org/ntsb/NYC86LA191.md): Bell 47G-5A · Portland, CT · Accident · No injuries · Limited investigation · Final report · Jul 20, 1986 · N59400 · Substantial damage
  > While climbing, shortly after takeoff, the eng quit for undetermined reasons. The pilot autorotated into a sand bank where the helicopter received substantial damage.
- [NTSB FTW85LA288](https://openairdocs.org/ntsb/FTW85LA288.md): Bell 47G-5 · Crane, TX · Accident · No injuries · Limited investigation · Final report · Jul 16, 1985 · N8197J · Destroyed
  > The helicopter was being operated from a flat bed trailer. The plt stated he had lifted to a 3 foot hover when the eng stopped. The helicopter suddenly rotated about 45 degs before he could stop it. The plt attempted to make an autorotation touchdown but was…
- [NTSB SEA84LA066](https://openairdocs.org/ntsb/SEA84LA066.md): Hiller UH-12E · Forest Grove, OR · Accident · No injuries · Limited investigation · Final report · Mar 12, 1984 · N62377 · Substantial damage
  > The plt reported that while hovering, during an external load operation, the eng lost power & blue smoke & flames exited the back of the helicopter. The helicopter then struck trees before coming to rest. During an investigation, the eng started normally &…
- [NTSB ATL83LA220](https://openairdocs.org/ntsb/ATL83LA220.md): Texas Helicopter OH-13H/M74A · Ruleville, MS · Accident · No injuries · Limited investigation · Final report · Jun 8, 1983 · N1001G · Substantial damage
  > The plt reported that the engine lost power during a swath run. A run-on landing was made. Prior to stopping, the right skid & right spray boom hit a rice level, and subsequenily, the main rotor blade chopped the tail boom. No preimpact failures were found.
- [NTSB LAX82DA360](https://openairdocs.org/ntsb/LAX82DA360.md): Bell 47G-5 · Soledad, CA · Accident · No injuries · Final report · Sep 27, 1982 · N8562F · Substantial damage
  > The pilot experienced a power loss during lift-off. A hard landing was made. No reason for the malfunction was found.

## 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 ('41525')
    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" = 350))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41525&occurrence=350

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