# NTSB investigations: Allison 250-C47 series

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.

Page 2 of 2 · 60 cases

## Cases, newest first

- [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 NYC02TA026](https://openairdocs.org/ntsb/NYC02TA026.md): Bell 407 · Whitley City, KY · Accident · Serious injuries · Final report · Nov 12, 2001 · N11HX · Substantial damage
  > The pilots decision to operate the helicopter at an airspeed in excess of the maximum demonstrated stable airspeed for the water bucket. A factor in the accident was the pilot did not follow the published emergency procedure.
- [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 LAX01FA277](https://openairdocs.org/ntsb/LAX01FA277.md): MD Helicopters 600N · Fountain Hills, AZ · Accident · Minor injuries · Field investigation · Final report · Aug 14, 2001 · N70457 · Substantial damage
  > the manufacturer's pilot's failure to maintain yaw control and main rotor speed while recovering from an unusual attitude induced by the customer pilot's inadequate control inputs while maneuvering at low altitude. The manufacturer's pilot's inadequate…
- [NTSB CHI01LA145](https://openairdocs.org/ntsb/CHI01LA145.md): Bell Helicopter 407 · Schoolcraft, MI · Accident · 1 fatal · Limited investigation · Final report · May 22, 2001 · N5259N · No damage
  > The pilot rated passenger failed to maintain clearance with the rotor blades as he exited the helicopter.
- [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.
- [NTSB DEN01LA060](https://openairdocs.org/ntsb/DEN01LA060.md): Bell 407 · Jackson, WY · Accident · No injuries · Limited investigation · Final report · Mar 2, 2001 · N9HE · Substantial damage
  > The pilot's failure to maintain adequate lateral and vertical clearance during landing. Factors were the clouds and snow-covered high terrain.
- [NTSB LAX01TA092](https://openairdocs.org/ntsb/LAX01TA092.md): McDonnell Douglas 600N · San Diego, CA · Accident · No injuries · Final report · Feb 21, 2001 · N606BP · Substantial damage
  > The student pilot's improper use of the rotorcraft flight controls, and the instructor pilot's inadequate supervision of the maneuver.
- [NTSB LAX99TA115](https://openairdocs.org/ntsb/LAX99TA115.md): McDonnell Douglas 600N · Rialto, CA · Accident · Minor injuries · Final report · Mar 10, 1999 · N626SB · Substantial damage
  > The pilot's improper in-flight decision to maneuver in the area while observed inclement weather approached, which led to a loss of control. Contributing factors were the low ceilings, mountainous terrain and spatial disorientation.
- [NTSB LAX98LA093](https://openairdocs.org/ntsb/LAX98LA093.md): Boeing MD600N · Mesa, AZ · Accident · No injuries · Limited investigation · Final report · Feb 3, 1998 · N9204D · Substantial damage
  > the attempt by flight test engineers to verify a height/velocity data point that was subsequently shown to be outside the aircraft's performance capabilities.

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

This list as a web page: https://openairdocs.org/ntsb?engine=03029&page=2

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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.