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

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 DEN99LA168](https://openairdocs.org/ntsb/DEN99LA168.md): Bell 47G3B2A · Tremonton, UT · Accident · No injuries · Limited investigation · Final report · Sep 23, 1999 · N83246 · Substantial damage
  > The pilot's failure to maintain rotor rpm while attempting a precautionary autorotation landing. A factor was the loss of engine power for undetermined reasons.
- [NTSB FTW98GA097](https://openairdocs.org/ntsb/FTW98GA097.md): Bell 47G-3B-2 · Spanish Fork, UT · Accident · 1 fatal · Final report · Jan 14, 1998 · N1461W · Substantial damage
  > A total loss of power due to repeated engine overspeeds. A related factor was unsuitable terrain.
- [NTSB SEA97LA158](https://openairdocs.org/ntsb/SEA97LA158.md): Bell 47G-3B-1 · Roosevelt, UT · Accident · Serious injuries · Limited investigation · Final report · Jul 5, 1997 · N8537F · Substantial damage
  > the pilot's failure to maintain directional control. Wind gusts were a factor.
- [NTSB DEN87LA235](https://openairdocs.org/ntsb/DEN87LA235.md): Bell 47-G3B2 · Oakley, UT · Accident · No injuries · Limited investigation · Final report · Sep 10, 1987 · N1038X · Substantial damage
  > The plt had just taken off from a confined area surrounded on two sides with electrical power lines. As he attempted to climb, he said his RPM began to bleed off. He stated that he made a right pedal turn to avoid the wires but was unable to prevent a hard…
- [NTSB DEN87LA120](https://openairdocs.org/ntsb/DEN87LA120.md): Bell 47G3B2A · Brigham City, UT · Accident · No injuries · Limited investigation · Final report · May 8, 1987 · N58131 · Substantial damage
  > An ag plt was ferrying a helicopter to another job in his local area. The plt, an ATP, had estimated that the helicopter had enough fuel for the flt. The helicopter's engine quit and an autorotation was performed, resulting in a hard landing. Less than one…
- [NTSB DEN87LA019](https://openairdocs.org/ntsb/DEN87LA019.md): Bell 47G-3B-1 · Goshen, UT · Accident · No injuries · Limited investigation · Final report · Nov 10, 1986 · N47042 · Substantial damage
  > The plt was practicing power recovery autorotations then attempted one power off, full stop. The plt allowed the main rotor RPM to decay during approach and took no corrective action. The acft landed hard with slight forward motion and the plt applied aft…
- [NTSB DEN84LA079](https://openairdocs.org/ntsb/DEN84LA079.md): Bell 47G-3B-1 · Ogden, UT · Accident · No injuries · Limited investigation · Final report · Jan 31, 1984 · N90769 · Substantial damage
  > The plt took off from a mountainous work site to return to salt lake city, UT. The wx was clear at the work site (elevation 6700 ft), but there was fog below. After encountering the fog, the plt hovered with a slow forward speed over snow covered terrain. A…
- [NTSB DEN80DTM36](https://openairdocs.org/ntsb/DEN80DTM36.md): Hiller Acft UH-12D · Coalville, UT · Accident · Serious injuries · Closed · Aug 8, 1980 · N31332 · Substantial damage
- [NTSB DEN80DTM01](https://openairdocs.org/ntsb/DEN80DTM01.md): Bell 47G3B1 · Torrey, UT · Accident · No injuries · Closed · Oct 1, 1979 · N8537F · Substantial damage
- [NTSB DEN79DTM24](https://openairdocs.org/ntsb/DEN79DTM24.md): Bell 47G3B1 · Beaver, UT · Accident · No injuries · Closed · Sep 16, 1979 · N512YP · Substantial damage
- [NTSB DEN75ATM08](https://openairdocs.org/ntsb/DEN75ATM08.md): Bell 47G-3B · Kamas, UT · Accident · No injuries · Closed · Dec 16, 1974 · N73218 · Substantial damage
- [NTSB DEN75AD009](https://openairdocs.org/ntsb/DEN75AD009.md): Bell 47G3B1 · Ogden, UT · Accident · 1 fatal · Closed · Sep 5, 1974 · N73972 · Destroyed
- [NTSB DEN73DTM30](https://openairdocs.org/ntsb/DEN73DTM30.md): Bell 47G3B1 · Magna, UT · Accident · Minor injuries · Closed · Jun 12, 1973 · N8532F · Destroyed
- [NTSB DEN73AD039](https://openairdocs.org/ntsb/DEN73AD039.md): Bell 47G3B1 · Salt Lake City, UT · Accident · No injuries · Closed · Feb 21, 1973 · N73972 · Substantial damage
- [NTSB DEN72AD011](https://openairdocs.org/ntsb/DEN72AD011.md): Bell 47G3B1 · Sandy, UT · Accident · No injuries · Closed · Sep 13, 1971 · N73972 · Substantial damage
- [NTSB DEN69D0043](https://openairdocs.org/ntsb/DEN69D0043.md): Bell 47G3B1 · Loa, UT · Accident · No injuries · Closed · Jun 22, 1968 · N1357X · Substantial damage
- [NTSB DEN66A0025](https://openairdocs.org/ntsb/DEN66A0025.md): Bell 47G3B1 · Salt Lake City, UT · Accident · Minor injuries · Closed · Oct 5, 1965 · N8537F · 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" = 'UT' 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=UT

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