# NTSB investigations: Lycoming HIO-360 series, 1999

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 MIA00GA057](https://openairdocs.org/ntsb/MIA00GA057.md): Hughes OH-6A · Fort Myers, FL · Accident · Serious injuries · Final report · Dec 20, 1999 · N72LC · Substantial damage
  > improper maintenance inspection of the helicopter by unknown maintenance personnel, resulting in a worn control rod bearing being continued in service, and subsequent separation, resulting in an in-flight loss of control and a crash.
- [NTSB SEA00FA014](https://openairdocs.org/ntsb/SEA00FA014.md): Enstrom F28C · Pendleton, OR · Accident · 1 fatal · Field investigation · Final report · Nov 2, 1999 · N635H · Destroyed
  > Failure to maintain clearance from the runway surface while maneuvering at low altitude, and inadequate remedial action after the tail rotor struck the surface.
- [NTSB NYC99LA217](https://openairdocs.org/ntsb/NYC99LA217.md): Hughes 269C · Utica, NY · Accident · No injuries · Limited investigation · Final report · Sep 1, 1999 · N58397 · Substantial damage
  > The pilot's failure to maintain control of the helicopter while maneuvering, which resulted in a hard landing. A factor in this accident was the pilot's lack of total experience in helicopters.
- [NTSB SEA99FA168](https://openairdocs.org/ntsb/SEA99FA168.md): Schweizer 269C · Westport, OR · Accident · 1 fatal · Field investigation · Final report · Aug 8, 1999 · N383T · Destroyed
  > The pilot's failure to maintain clearance from terrain. Factors include low clouds and visibility and near-night light conditions.
- [NTSB DEN99LA092](https://openairdocs.org/ntsb/DEN99LA092.md): Hughes 269A · Parkman, WY · Accident · Minor injuries · Limited investigation · Final report · Jun 1, 1999 · N7052L · Substantial damage
  > The pilot's inadequate in-flight planning by exceeding the helicopter's performance climb capability. Factors were the downdraft encountered during initial climb following takeoff, and the high density altitude.
- [NTSB SEA99LA048](https://openairdocs.org/ntsb/SEA99LA048.md): Enstrom F-28C · Pendleton, OR · Accident · No injuries · Limited investigation · Final report · Apr 7, 1999 · N51770 · Substantial damage
  > A loss of power due to water contamination of the fuel. Factors include the inability of the helicopter to perform a successful autorotation immediately after takeoff.
- [NTSB NYC99LA082](https://openairdocs.org/ntsb/NYC99LA082.md): Schweizer 269C · Westerville, OH · Accident · Serious injuries · Limited investigation · Final report · Mar 29, 1999 · N15SS · Substantial damage
  > The failure of the pilot to maintain control of the helicopter.

## 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") = 1999
  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=1999

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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.