# NTSB investigations: Lycoming HIO-360 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 DEN92LA001](https://openairdocs.org/ntsb/DEN92LA001.md): Enstrom F-28C · Evergreen, CO · Accident · No injuries · Limited investigation · Final report · Oct 2, 1991 · N552H · Substantial damage
  > In flight encounter with a sudden downdraft. A factor was: the pilot's lack of total experience in aircraft type.
- [NTSB FTW91LA150](https://openairdocs.org/ntsb/FTW91LA150.md): Hughes 269A-1 · No. Little Rock, AR · Accident · No injuries · Limited investigation · Final report · Aug 18, 1991 · N65372 · Substantial damage
  > The pilot's failure to maintain main rotor RPM, his delayed flare, and the improper touchdown.
- [NTSB SEA91LA044](https://openairdocs.org/ntsb/SEA91LA044.md): Schweizer Hughes 269C · Princeton, OR · Accident · No injuries · Limited investigation · Final report · Jan 19, 1991 · N75070 · Substantial damage
  > The pilot's attempt to hover out of ground effect at a density altitude and gross weight in tailwind weather conditions that exceeded the aircraft performance limits. Factors relating to the accident were the high density altitude and tailwind weather…

## 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 ('41524'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41524&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.