# NTSB investigations: Allison 250 SER 250HP: Loss of engine power (total)

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 WPR25LA134](https://openairdocs.org/ntsb/WPR25LA134.md): Bell 206B · Amboy, WA · Accident · No injuries · Class 3 · Limited · Preliminary report · Apr 15, 2025 · N16671 · Substantial damage
  > On April 14, 2025, about 1800 Pacific daylight time, a Bell 206B, N16671, was substantially damaged when it was involved in an accident near Amboy, Washington. The pilot was not injured. The helicopter was operated as a Title 14 Code of Federal Regulations,…
- [NTSB ERA21LA023](https://openairdocs.org/ntsb/ERA21LA023.md): Bell 206 · Zephyrhills, FL · Accident · No injuries · Class 3 · Limited · Final report · Oct 16, 2020 · N777CP · Substantial damage
  > Improper torquing of the “B” nut at the fuel control unit, which led to a total loss of engine power and subsequent autorotation that resulted in substantial damage.
- [NTSB CEN16FA171](https://openairdocs.org/ntsb/CEN16FA171.md): Mcdonnell Douglas Helicopter 369E · Reedsville, WI · Accident · 1 fatal · Field investigation · Final report · May 4, 2016 · N629JK · Substantial damage
  > The failure of the power turbine governor's dual-spool bearing due to a lack of lubrication, which resulted in a complete loss of engine power and subsequent impact with terrain.
- [NTSB CEN15LA370](https://openairdocs.org/ntsb/CEN15LA370.md): Bell 206B · Cresco, IA · Accident · No injuries · Limited investigation · Final report · Aug 18, 2015 · N5743W · Substantial damage
  > The loss of engine power due to the high-cycle fatigue failure of the third-stage turbine wheel.
- [NTSB CEN13CA145](https://openairdocs.org/ntsb/CEN13CA145.md): Hughes 369HS · London, OH · Accident · No injuries · Data collection · Final report · Jan 29, 2013 · N193M · Substantial damage
  > The pilot's failure to comply with established cold weather operating procedures, which resulted in a total loss of engine power. Contributing to the accident was the pilot's excessive aft cyclic input during the landing flare, which resulted in main rotor…
- [NTSB WPR12LA408](https://openairdocs.org/ntsb/WPR12LA408.md): Bell Helicopter Textron 206L-1 · Grand Canyon, AZ · Accident · No injuries · Limited investigation · Final report · Sep 9, 2012 · N5745Y · Substantial damage
  > A total loss of engine power during descent for reasons that could not be determined because postaccident engine examinations and testing revealed no evidence of an anomaly that would have precluded normal operation.
- [NTSB WPR12CA236](https://openairdocs.org/ntsb/WPR12CA236.md): Bell 206B · Burbank, WA · Accident · No injuries · Data collection · Final report · May 30, 2012 · N106TV · Substantial damage
  > The failure of maintenance personnel to properly torque an air tube fitting, which resulted in a total loss of engine power.
- [NTSB CEN10LA431](https://openairdocs.org/ntsb/CEN10LA431.md): Bell 47G-4A · Rochester, MN · Accident · 1 fatal · Limited investigation · Final report · Jul 24, 2010 · N124SH · Substantial damage
  > The total loss of engine power due to a high-cycle fatigue fracture of a first-stage compressor blade. The reason for the fracture could not be determined during postaccident examination.

## 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 ('03002', '03003')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '341'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/341/cases?engine=03002

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