# NTSB investigations: Hughes TH-55: Loss of engine power

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 MIA07CA103](https://openairdocs.org/ntsb/MIA07CA103.md): Hughes 269A · Las Piedras, PR · Accident · Serious injuries · Data collection · Final report · May 29, 2007 · N63HD · Substantial damage
  > The failure of the non-certificated pilot to maintain a proper rate of descent during the autorotative landing following a reported loss of engine power for undetermined reasons, resulting in a hard landing.
- [NTSB ATL01TA081](https://openairdocs.org/ntsb/ATL01TA081.md): Hughes TH-55 · Midway, GA · Accident · No injuries · Final report · Jul 9, 2001 · N7053X · Substantial damage
  > The loss of engine power for undetermined reasons. A factoe was the lack of suitable terrain upon which an emergency landing could be made, which resulted in a rollover upon touchdown in a marshy area.
- [NTSB MIA97LA103](https://openairdocs.org/ntsb/MIA97LA103.md): Hughes TH-55 · Cullman, AL · Accident · Serious injuries · Limited investigation · Final report · Mar 28, 1997 · N818D · Substantial damage
  > a loss of engine power for undetermined reasons and the pilot-in-command's failure to maintain control of the helicopter. Factors in this accident were: an improper autorotation as a result of improper collective use and resulting failure to maintain main…

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4471002')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 350))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=4471002&occurrence=350

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