# NTSB investigations: Allison 250-C20 series: 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 ERA21FA130](https://openairdocs.org/ntsb/ERA21FA130.md): Bell 206 · St Thomas, CB · Accident · 4 fatal · Class 3 · Field · Final report · Feb 15, 2021 · N13AT · Destroyed
  > A total loss of engine power due to fatigue failure of two of the stage 3 compressor blades. Contributing to the failure of the compressor blades was the failure of maintenance personnel to inspect the compressor at the recommended interval for operation in…
- [NTSB CEN20LA073](https://openairdocs.org/ntsb/CEN20LA073.md): Hiller UH 12E · Dinosaur, CO · Accident · No injuries · Class 3 · Limited · Final report · Feb 1, 2020 · N7173S · Substantial damage
  > Failure of a S4 compressor blade due to a fatigue crack that likely initiated at a corrosion pit. Contributing to the accident was maintenance personnel’s failure to detect the corrosion pits during maintenance.
- [NTSB ERA18LA183](https://openairdocs.org/ntsb/ERA18LA183.md): Bell 206 · Rio Grande, PR · Accident · 1 fatal · Limited investigation · Final report · Jun 30, 2018 · N10CV · Substantial damage
  > A total loss of engine power due to oil exhaustion, which resulted in an uncontrolled descent and hard landing.
- [NTSB ERA17LA209](https://openairdocs.org/ntsb/ERA17LA209.md): Hughes 369 · Dennis, WV · Accident · No injuries · Limited investigation · Final report · Jun 23, 2017 · N765KV · Substantial damage
  > The unporting of fuel due to the helicopter's nose-up attitude during long line operations, which resulted in fuel starvation and a total loss of engine power.
- [NTSB WPR13GA374](https://openairdocs.org/ntsb/WPR13GA374.md): Mcdonnell Douglas Helicopter 369E · Burns, OR · Accident · No injuries · Final report · Aug 12, 2013 · N62PJ · Substantial damage
  > The total loss of engine power during cruise flight due to the separation of one of the 4th-stage turbine wheel blades due to low-cycle fatigue cracking that had progressed to high-cycle fatigue cracking, which ultimately led to the overload failure of the…
- [NTSB ERA13LA344](https://openairdocs.org/ntsb/ERA13LA344.md): Hughes 369D · Center Point, WV · Accident · Minor injuries · Limited investigation · Final report · Jul 29, 2013 · N31HM · Substantial damage
  > A total loss of engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB WPR10CA314](https://openairdocs.org/ntsb/WPR10CA314.md): Bell 206B · Rickreall, OR · Accident · No injuries · Data collection · Final report · Jun 23, 2010 · N3194G · Substantial damage
  > A total loss of engine power due to fuel exhaustion as a result of the pilot's failure to ensure that adequate fuel was aboard for the flight.
- [NTSB ERA09LA460](https://openairdocs.org/ntsb/ERA09LA460.md): Mcdonnell Douglas Helicopter 369E · Acworth, GA · Accident · Serious injuries · Limited investigation · Final report · Aug 12, 2009 · N527BB · Substantial damage
  > The loss of engine power due to the fatigue failure of the third-stage turbine wheel airfoil.
- [NTSB ERA09IA499](https://openairdocs.org/ntsb/ERA09IA499.md): Mcdonnell Douglas Helicopter 369E · Allentown, PA · Incident · No injuries · Incident investigation · Final report · Sep 29, 2008 · N801SB · Minor damage
  > The fatigue failure of a blade in the second-stage turbine wheel, which resulted in a total loss of engine power.
- [NTSB SEA08FA071](https://openairdocs.org/ntsb/SEA08FA071.md): Mcdonnell Douglas 369E · Hilo, HI · Accident · Minor injuries · Field investigation · Final report · Feb 8, 2008 · N698DM · Substantial damage
  > A leak in the fuel filter pressure differential switch that resulted in a loss of engine power. Contributing to the accident was uneven terrain that hindered a successful emergency landing.

## 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 ('03020')
    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=03020

---
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.