# NTSB investigations: Allison 250-C47 series: Airframe/component/system failure/malfunction

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 DFW08IA045](https://openairdocs.org/ntsb/DFW08IA045.md): Bell 407 · Hig Island A595 · Incident · No injuries · Incident investigation · Final report · Dec 15, 2007 · N407AK · No damage
  > The loss of tail rotor effectiveness for undetermined reasons.
- [NTSB FTW04IA023](https://openairdocs.org/ntsb/FTW04IA023.md): Bell 407 · Eugene Is. 27 · Incident · No injuries · Incident investigation · Final report · Nov 16, 2003 · N405PH · Minor damage
  > The loss of engine power due to the failure of the 3rd stage turbine wheel and subsequent catastrophic failure of the turbine assembly.
- [NTSB FTW03FA117](https://openairdocs.org/ntsb/FTW03FA117.md): Bell 407 · Houma, LA · Accident · No injuries · Field investigation · Final report · Mar 24, 2003 · N501PH · Substantial damage
  > The loss of tail rotor drive and anti-torque control resulting from the fracture and separation of the #5 tail rotor drive segment due to the overtemperature and subsequent failure of the #5 hangar bearing.
- [NTSB ATL02LA095](https://openairdocs.org/ntsb/ATL02LA095.md): McDonnell Douglas MD-600N · Deland, FL · Accident · No injuries · Limited investigation · Final report · May 10, 2002 · N810LA · Substantial damage
  > The pilot's failure to follow the FADEC malfunction checklist that resulted in the loss of rotor RPM, and the pilot's improper use of the flight controls during the precautionary landing that resulted in a hard landing. A factor was the malfunction of the…
- [NTSB LAX02IA013](https://openairdocs.org/ntsb/LAX02IA013.md): McDonnell Douglas 600N · Long Beach, CA · Incident · No injuries · Incident investigation · Final report · Oct 23, 2001 · N959SD · No damage
  > The fatigue failure of a 5/16-inch boom attach bolt was most probably caused by the angular misalignment between the tail boom bolt hole and the fuselage mounted nutplate.
- [NTSB FTW01FA115](https://openairdocs.org/ntsb/FTW01FA115.md): Bell 407 · Vermillion 44 · Accident · No injuries · Field investigation · Final report · May 4, 2001 · N917AL · Substantial damage
  > Failure of the engine-to-transmission driveshaft coupling due to fatigue.

## 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.engine_model_code IN ('03029')
    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" = 130))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03029&occurrence=130

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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.