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

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 ERA20LA216](https://openairdocs.org/ntsb/ERA20LA216.md): Bell 47G · Atoka, TN · Accident · No injuries · Class 3 · Limited · Final report · Jun 15, 2020 · N473TT · Substantial damage
  > A total loss of engine power due to a blocked fuel line; the reason for the blockage could not be determined based on the available evidence.
- [NTSB ATL91FA013](https://openairdocs.org/ntsb/ATL91FA013.md): Bell 47J-2 · Gatlinburg, TN · Accident · Serious injuries · Field investigation · Final report · Nov 1, 1990 · N49DA · Destroyed
  > The accident was inadequate maintenance of the helicopter, allowing a tail rotor drive shaft bearing to exceed wear limits. This resulted in high loads on the tail rotor drive shaft, and the resulting fatigue failure of the drive shaft.
- [NTSB IAD77DA011](https://openairdocs.org/ntsb/IAD77DA011.md): Bell 47G-2 · Pigeon Forge, TN · Accident · 1 fatal · Closed · Nov 6, 1976 · N6755D · Destroyed
- [NTSB IAD76II014](https://openairdocs.org/ntsb/IAD76II014.md): Bell 47G-2 · Pigeon Forge, TN · Incident · No injuries · Closed · Aug 29, 1975 · N6755D · Minor damage
- [NTSB MIA69F0341](https://openairdocs.org/ntsb/MIA69F0341.md): Bell 47G-3B · Kingsport, TN · Accident · Minor injuries · Closed · Jan 18, 1969 · N204Z · 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" = 'TN' 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=TN

---
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.