# NTSB investigations: Lycoming GO-480 series, 1991

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 SEA91LA244](https://openairdocs.org/ntsb/SEA91LA244.md): Grumman G-44 · Metaline Falls, WA · Accident · No injuries · Limited investigation · Final report · Sep 7, 1991 · N63350 · Substantial damage
  > The pilot's inadvertent use of the parking brake. A factor contributing to the accident was the absence of the parking brake on the landing checklist.
- [NTSB NYC91LA195](https://openairdocs.org/ntsb/NYC91LA195.md): Beech C50 · Salem, OH · Accident · Minor injuries · Limited investigation · Final report · Jul 31, 1991 · N9674R · Substantial damage
  > Engine failure as a result of improper maintenance and failure of the propeller feathering system for an undetermined reason. Factors were aircraft poor climb performance as resulted of the unfeathered propeller and obstructions which prevented a return to…
- [NTSB ANC91LA093](https://openairdocs.org/ntsb/ANC91LA093.md): Helio H-295 · Port Alsworth, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 9, 1991 · N456JH · Substantial damage
  > Failure of the pilot to maintain sufficient altitude and clearance from mountainous terrain. Factors related to the accident were: the rising terrain and a downdraft.
- [NTSB FTW91DPG12](https://openairdocs.org/ntsb/FTW91DPG12.md): Bell 47-G3B1 · Colt, AR · Accident · Minor injuries · Final report · Jun 1, 1991 · N31052 · Destroyed
  > Loss of engine power for an undetermined reason. A factor was the unsuitable terrain.
- [NTSB ATL91LA065](https://openairdocs.org/ntsb/ATL91LA065.md): Helio H-295 · Dunlap, TN · Accident · No injuries · Limited investigation · Final report · Mar 12, 1991 · N42013 · Substantial damage
  > Failure of the pilot to maintain control of the aircraft, which resulted in a ground loop/swerve. The crosswind was a related factor.

## 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 year(c."eventDate") = 1991
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41527'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41527&year=1991

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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.