# NTSB investigations: Allison 250-C10D

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 CEN20LA187](https://openairdocs.org/ntsb/CEN20LA187.md): Bell OH-58A · West Branch, MI · Accident · No injuries · Class 3 · Limited · Final report · May 20, 2020 · N153SA · Substantial damage
  > The pilot's failure to maintain rotor rpm during a precautionary autorotation, which resulted in a hard landing. Contributing to the accident was the airframe vibration for reasons that could not be determined because examination of the helicopter revealed no…
- [NTSB CEN17LA336](https://openairdocs.org/ntsb/CEN17LA336.md): Hughes 369A · Burnet, TX · Accident · Serious injuries · Limited investigation · Final report · Sep 2, 2017 · N50MP · Substantial damage
  > The pilot's inadequate inflight decision making, which resulted in a total loss of engine power due to fuel exhaustion.
- [NTSB GAA16LA182](https://openairdocs.org/ntsb/GAA16LA182.md): Hughes 369 · Weatherford, TX · Accident · Serious injuries · Limited investigation · Final report · Apr 8, 2016 · N298SD · Substantial damage
  > The pilot/mechanic's inadequate postmaintenance and preflight inspections, which resulted in his failure to remove the antitorque pedal lock and a subsequent loss of control during hover operations.
- [NTSB ERA13LA022](https://openairdocs.org/ntsb/ERA13LA022.md): Hughes/Helicopter Assocs 369A · West Chester, PA · Accident · No injuries · Limited investigation · Final report · Oct 13, 2012 · N546 · 2 aircraft · Substantial damage
  > The pilot’s failure to see and avoid the preceding helicopter while maneuvering for landing. Contributing to the accident were the flight lead pilot’s inadequate preflight briefing and in-flight instruction to the formation pilots, which resulted in the loss…
- [NTSB CEN11LA370](https://openairdocs.org/ntsb/CEN11LA370.md): Bell 47G-3B-1 · Lakeville, MN · Accident · Serious injuries · Limited investigation · Final report · May 25, 2011 · N96SH · Substantial damage
  > The loss of engine power due to a loose B-nut on the compressor discharge pressure bleed line.
- [NTSB ANC09LA110](https://openairdocs.org/ntsb/ANC09LA110.md): Hughes 369A (OH-6A) · Palmer, AK · Accident · No injuries · Limited investigation · Final report · Sep 29, 2009 · N501SU · Substantial damage
  > A partial loss of engine power after take off for an undetermined reason, which resulted in a hard landing.
- [NTSB CEN09CA332](https://openairdocs.org/ntsb/CEN09CA332.md): Hughes 369A · Baltimore, OH · Accident · No injuries · Data collection · Final report · May 30, 2009 · N298SD · Substantial damage
  > The pilot's failure to attain a proper touchdown point, and his decision not to perform a go-around.
- [NTSB ANC04LA087](https://openairdocs.org/ntsb/ANC04LA087.md): Hughes OH-6A · Anchorage, AK · Accident · Serious injuries · Limited investigation · Final report · Aug 6, 2004 · N243D · Substantial damage
  > A loss of tail rotor effectiveness during aerial taxi, and the pilot's delayed remedial action to counteract a rapid right yaw, which resulted in an in-flight loss of directional control, and in-flight collision with terrain. A factor contributing to the…
- [NTSB ATL01LA070](https://openairdocs.org/ntsb/ATL01LA070.md): Hughes 369A · Wadesboro, NC · Accident · No injuries · Limited investigation · Final report · Jul 3, 2001 · N539 · Substantial damage
  > The pilot's inadequate pre-flight planning which resulted in fuel exhaustion and the subsequent loss of engine power. A factor was rough and uneven terrain.
- [NTSB SEA93LA030](https://openairdocs.org/ntsb/SEA93LA030.md): Hughes 369HS · Scotts Mills, OR · Accident · No injuries · Limited investigation · Final report · Nov 27, 1992 · N9228F · Substantial damage
  > The pilot in command's misjudged descent. Factors include the pilot in command's lack of experience in this type of operation.
- [NTSB FTW92LA199](https://openairdocs.org/ntsb/FTW92LA199.md): Hughes 369HS · Monroe, LA · Accident · Minor injuries · Limited investigation · Final report · Aug 3, 1992 · N501FH · Substantial damage
  > The pilot's failure to maintain adequate rotor RPM during autorotation. Factors were the tailwind and the power loss for undetermined reasons.
- [NTSB SEA79DYE11](https://openairdocs.org/ntsb/SEA79DYE11.md): Hughes 369HS · Aberdeen, WA · Accident · Minor injuries · Closed · Jan 22, 1979 · N9256F · Substantial damage

## 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 ('03035'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03035

---
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.