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

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 DEN07LA155](https://openairdocs.org/ntsb/DEN07LA155.md): Bell 47G-3B-1 · Avondale, CO · Accident · No injuries · Limited investigation · Final report · Sep 12, 2007 · N360SS · Substantial damage
  > The pilot's failure to attain translational lift and his improper flare. A contributing factor in this accident was the sudden wind shift.
- [NTSB FTW97LA319](https://openairdocs.org/ntsb/FTW97LA319.md): Bell 47G-3B-2 · Montrose, CO · Accident · No injuries · Limited investigation · Final report · Aug 19, 1997 · N2243W · Substantial damage
  > failure of the flight instructor (CFI) to properly supervise the flight and ensure that adequate rotor rpm was maintainted during the autorotation/landing. The high density altitude was a related factor.
- [NTSB FTW96TA383](https://openairdocs.org/ntsb/FTW96TA383.md): Bell 47G-3B-1 · Rangely, CO · Accident · No injuries · Final report · Sep 10, 1996 · N1335X · Substantial damage
  > the pilot's excessive cyclic control input during a low altitude operation, and his failure to maintain altitude/clearance from high vegetation (sage brush). The proximity of high vegetation was a related factor.
- [NTSB DEN91LA096](https://openairdocs.org/ntsb/DEN91LA096.md): Bell 47G-3B-1 · Colorado Spring, CO · Accident · No injuries · Limited investigation · Final report · Jul 4, 1991 · N40DP · Substantial damage
  > The pilot attempting to operate the helicopter outside the design operating envelope. Factors were: high altitude, high temperature, and high density altitude.
- [NTSB DEN88FA106](https://openairdocs.org/ntsb/DEN88FA106.md): Bell 47G-3B1 · Cortez, CO · Accident · 1 fatal · Field investigation · Final report · May 7, 1988 · N8455E · Destroyed
  > The plt said that he had just taken off and reached an alt of about 300 ft when his collective control went 'limp'. The helicopter entered a descent, partially controlled by the plt using throttle and cyclic control inputs. The helicopter touched down in soft…
- [NTSB DEN86LA079](https://openairdocs.org/ntsb/DEN86LA079.md): Bell 47G3 B-2 · Grand Junction, CO · Accident · Minor injuries · Limited investigation · Final report · Feb 18, 1986 · N1424W · Substantial damage
  > The plt stated that while turning to the intended landing area, the helicopter he was piloting encountered both downdrafts & tailwind. The plt indicated the helicopter settled until grnd contact.
- [NTSB DEN83LA002](https://openairdocs.org/ntsb/DEN83LA002.md): Bell 47G3B · Nr. Englewood, CO · Accident · No injuries · Limited investigation · Final report · Oct 5, 1982 · N204Z · Destroyed
  > Pilot was practicing maneuvers for certification test. He said he made a precautionary landing due to suspected engine trouble and a fire started under the aircraft in the grass. He exited the aircraft but left battery and radio on. This investigation…
- [NTSB DEN81FTE51](https://openairdocs.org/ntsb/DEN81FTE51.md): Hiller UHI2D · Craig, CO · Accident · No injuries · Closed · Sep 8, 1981 · N96107 · Destroyed
- [NTSB DEN77FTE47](https://openairdocs.org/ntsb/DEN77FTE47.md): Bell 47G3B1 · Wellington, CO · Accident · Minor injuries · Closed · May 24, 1977 · N1301X · Destroyed
- [NTSB DEN77FTE31](https://openairdocs.org/ntsb/DEN77FTE31.md): Bell 47G3B2 · Greeley, CO · Accident · Serious injuries · Closed · Apr 8, 1977 · N665GD · Destroyed
- [NTSB DEN77FTE18](https://openairdocs.org/ntsb/DEN77FTE18.md): Bell 47G3B1 · Cimmaron, CO · Accident · Minor injuries · Closed · Jan 24, 1977 · N1362X · Destroyed
- [NTSB DEN76FTE94](https://openairdocs.org/ntsb/DEN76FTE94.md): Bell 47G3B2 · Aspen, CO · Accident · Serious injuries · Closed · Aug 24, 1976 · N4074G · Destroyed
- [NTSB DEN76FTE18](https://openairdocs.org/ntsb/DEN76FTE18.md): Bell 47G3B1 · Denver, CO · Accident · No injuries · Closed · Aug 24, 1975 · N90769 · Substantial damage
- [NTSB DEN75FTE54](https://openairdocs.org/ntsb/DEN75FTE54.md): Bell 47G3B1 · Montrose, CO · Accident · No injuries · Closed · Mar 4, 1975 · N1362X · Substantial damage
- [NTSB DEN73FTE92](https://openairdocs.org/ntsb/DEN73FTE92.md): Bell 47G3B1 · Carbondale, CO · Accident · No injuries · Closed · Jun 9, 1973 · N1357X · Substantial damage
- [NTSB DEN73AD015](https://openairdocs.org/ntsb/DEN73AD015.md): Bell 47G3B1 · Hayden, CO · Accident · No injuries · Closed · Oct 3, 1972 · N1397X · Substantial damage
- [NTSB DEN70D0097](https://openairdocs.org/ntsb/DEN70D0097.md): Bell 47G3B2 · Breckenridge, CO · Accident · Minor injuries · Closed · Jul 17, 1969 · N4074G · Substantial damage
- [NTSB DEN70F0008](https://openairdocs.org/ntsb/DEN70F0008.md): Bell 47G3B1 · Broomfield, CO · Accident · Serious injuries · Closed · Jun 14, 1969 · N8541F · Substantial damage
- [NTSB DEN69A0004](https://openairdocs.org/ntsb/DEN69A0004.md): Bell 47G3B2 · Aspen, CO · Accident · Serious injuries · Closed · Jul 29, 1968 · N4074G · Substantial damage
- [NTSB DEN68A0020](https://openairdocs.org/ntsb/DEN68A0020.md): Bell 47G-3B · Silverthorne, CO · Accident · Minor injuries · Closed · Oct 12, 1967 · N1397X · Substantial damage
- [NTSB DEN68A0006](https://openairdocs.org/ntsb/DEN68A0006.md): Bell 47G3B1 · Leadville, CO · Accident · No injuries · Closed · Jul 22, 1967 · N1334X · Substantial damage
- [NTSB DEN67A0049](https://openairdocs.org/ntsb/DEN67A0049.md): Bell 47G3B1 · Estes Park, CO · Accident · Serious injuries · Closed · Mar 1, 1967 · N8541F · 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" = 'CO' 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=CO

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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.