# NTSB investigations: Lycoming TVO-435-GIA, MT

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 SEA98LA006](https://openairdocs.org/ntsb/SEA98LA006.md): Bell 47-G3B · Winston, MT · Accident · No injuries · Limited investigation · Final report · Oct 19, 1997 · N47AH · Substantial damage
  > Fuel starvation due to fuel flow restriction from a failed carburetor automatic mixture control device. Factors include night light conditions for the forced landing.
- [NTSB DEN88LA135](https://openairdocs.org/ntsb/DEN88LA135.md): Bell 47G · Terry, MT · Accident · Serious injuries · Limited investigation · Final report · Jun 25, 1988 · N2243W · Substantial damage
  > The aircraft was on a ferry flight from alpine, WY. To belfield, ND. The plt departed alpine at approximately 0950 and made several enroute stops to refuel. The plt intended to land at miles city, MT to refuel but he got lost and flew to Terry, MT, located 38…
- [NTSB DEN84LA260](https://openairdocs.org/ntsb/DEN84LA260.md): Bell 47G · West Glacier, MT · Accident · No injuries · Limited investigation · Final report · Aug 5, 1984 · N7965J · Substantial damage
  > Following in-flight power loss the pilot performed an autorotation to a forced landing on a highway. On touchdown, the main rotor made contact with a passing motor home. Investigation revealed no fuel on board, although the pilot calculated 0.6 hours of fuel…
- [NTSB DEN83LA154](https://openairdocs.org/ntsb/DEN83LA154.md): Bell 47G-3B-1 Soloy · Townsend, MT · Accident · No injuries · Limited investigation · Final report · Jun 30, 1983 · N1334X · Substantial damage
  > The helicopter made a hard touchdown during an autorotative forced landing after the engine quit. During the landing themain rotor severed the tail boom. The pilot stretched the autorotational glide to reach a hay field and lost main rotor RPM in the process.…
- [NTSB DEN83LA006](https://openairdocs.org/ntsb/DEN83LA006.md): Bell 47G3B1 · Malta, MT · Accident · Minor injuries · Limited investigation · Final report · Oct 2, 1982 · N7928S · Substantial damage
  > The pilot stated that he "was spraying the alfalfa field west to east" and that "there were tall cottonwood trees on three sides. A very sudden wind "came up" and "pushed" him into a tree.
- [NTSB SEA78DTA18](https://openairdocs.org/ntsb/SEA78DTA18.md): Bell 47G3B1 · Billings, MT · Accident · No injuries · Closed · Aug 20, 1978 · N90769 · Substantial damage
- [NTSB SEA77FTI11](https://openairdocs.org/ntsb/SEA77FTI11.md): Bell 47G3B1 · Polson, MT · Accident · Serious injuries · Closed · Apr 17, 1977 · N12437 · Substantial damage
- [NTSB SEA77FTI01](https://openairdocs.org/ntsb/SEA77FTI01.md): Bell 47J-2 · Quake Lake, MT · Accident · No injuries · Closed · Oct 31, 1976 · N2835B · Substantial damage
- [NTSB SEA74DTI29](https://openairdocs.org/ntsb/SEA74DTI29.md): Bell 47G3B1 · Lima, MT · Accident · No injuries · Closed · Jun 16, 1974 · N7928S · Substantial damage
- [NTSB SEA74DTI18](https://openairdocs.org/ntsb/SEA74DTI18.md): Bell 47G3B1 · Conrad, MT · Accident · No injuries · Closed · Feb 24, 1974 · N7936S · Substantial damage
- [NTSB SEA73FTA06](https://openairdocs.org/ntsb/SEA73FTA06.md): Bell 47G-3B · Billings, MT · Accident · No injuries · Closed · Apr 23, 1973 · N204Z · Substantial damage
- [NTSB SEA72FTA17](https://openairdocs.org/ntsb/SEA72FTA17.md): Bell 47G-3B · Harlowton, MT · Accident · No injuries · Closed · Apr 27, 1972 · N204Z · Substantial damage
- [NTSB SEA68A0050](https://openairdocs.org/ntsb/SEA68A0050.md): Bell 47G-3B · Superior, MT · Accident · No injuries · Closed · Jan 24, 1968 · N73269 · Substantial damage
- [NTSB SEA68A0012](https://openairdocs.org/ntsb/SEA68A0012.md): Bell 47G-3B · Augusta, MT · Accident · No injuries · Closed · Aug 7, 1967 · N1357X · Substantial damage
- [NTSB SEA67A0002](https://openairdocs.org/ntsb/SEA67A0002.md): Bell 47-G3B · Clinton, MT · Accident · Serious injuries · Closed · Jul 14, 1966 · N8509F · 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."eventStateOrRegion" = 'MT' 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 ('41526'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41526&state=MT

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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.