# NTSB investigations: Turbomeca ARRIEL-1D1: Loss of control in flight

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 WPR25LA058](https://openairdocs.org/ntsb/WPR25LA058.md): Eurocopter AS 350 B2 · Los Alamitos, CA · Accident · Minor injuries · Class 4 · Limited · Final report · Dec 10, 2024 · N913WB · Substantial damage
  > The student pilot’s failure to maintain directional control during a run-on landing and the flight instructor’s excessive correction which resulted in impact with terrain. Contributing to the accident was the flight instructor’s delayed remedial action.
- [NTSB ERA22FA343](https://openairdocs.org/ntsb/ERA22FA343.md): Eurocopter AS350 · Andalusia, AL · Accident · Serious injuries · Class 3 · Field · Final report · Jul 29, 2022 · N124LN · Substantial damage
  > The pilot’s acute incapacitation by a syncopal episode, which resulted in the helicopter departing controlled flight and colliding with terrain.
- [NTSB CEN21LA216](https://openairdocs.org/ntsb/CEN21LA216.md): Aerospatiale AS350 B2 Ecureuil · Yukon, OK · Accident · No injuries · Class 3 · Limited · Final report · May 12, 2021 · N841BP · Destroyed
  > The pilot receiving instruction’s untimely and unidentified inadvertent activation of the hydraulic cut-off switch, which turned off the hydraulic system while the helicopter was at slow airspeed followed by a rapid power increase, which resulted in a loss of…
- [NTSB CEN18FA149](https://openairdocs.org/ntsb/CEN18FA149.md): Eurocopter AS 350 B2 · Hazelhurst, WI · Accident · 3 fatal · Field investigation · Final report · Apr 27, 2018 · N127LN · Destroyed
  > The pilot's loss of helicopter control as a result of fatigue during cruise flight at night.
- [NTSB GAA17CA562](https://openairdocs.org/ntsb/GAA17CA562.md): Eurocopter AS 350 · Fullerton, CA · Accident · Minor injuries · Data collection · Final report · Sep 27, 2017 · N515ET · Substantial damage
  > The pilot under evaluation’s failure to maintain adequate airspeed during a simulated hydraulic failure, which resulted in a loss of helicopter control. Contributing to the accident was the check pilot’s delayed remedial action.
- [NTSB WPR14LA272](https://openairdocs.org/ntsb/WPR14LA272.md): Aerospatiale AS350B2 · Dietrich, ID · Accident · Serious injuries · Limited investigation · Final report · Jun 29, 2014 · N350CR · Substantial damage
  > The pilot’s sudden incapacitation from a previously undiagnosed medical condition while in cruise flight, which resulted in his inability to maintain helicopter control.
- [NTSB WPR14FA137](https://openairdocs.org/ntsb/WPR14FA137.md): Eurocopter AS 350 B2 · Seattle, WA · Accident · 2 fatal · Field investigation · Final report · Mar 18, 2014 · N250FB · Destroyed
  > The loss of helicopter control due to a loss of hydraulic boost to the tail rotor pedal controls at takeoff, followed by a loss of hydraulic boost to the main rotor controls after takeoff. The reason for the loss of hydraulic boost to the main and tail rotor…
- [NTSB CEN13FA344](https://openairdocs.org/ntsb/CEN13FA344.md): Eurocopter AS350B2 · Talihina, OK · Accident · 1 fatal · Field investigation · Final report · Jun 11, 2013 · N935EM · Substantial damage
  > The helicopter pilot's failure to see and avoid the 40-ft-tall lamp post during takeoff. Contributing to the accident was the pilot's inadequate preflight evaluation of the obstructions in the takeoff path.
- [NTSB CEN11FA359](https://openairdocs.org/ntsb/CEN11FA359.md): Eurocopter AS 350 B2 · Fort Worth, TX · Accident · Minor injuries · Field investigation · Final report · May 29, 2011 · N747CH · Substantial damage
  > The pilot’s loss of control due to his not maintaining adequate airspeed and altitude during a simulated hydraulic flight control failure. Contributing to the accident was the flight instructor’s inadequate supervision and delayed remedial response.
- [NTSB WPR11GA144](https://openairdocs.org/ntsb/WPR11GA144.md): Eurocopter AS 350 B2 · Riverside, CA · Accident · Minor injuries · Final report · Feb 24, 2011 · N965SD · Substantial damage
  > The failure of both pilots to follow proper procedures during a simulated hydraulic emergency that resulted in a loss of helicopter control. Contributing to the accident was the flight instructor’s delayed remedial action.

## 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 ('60053')
    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" = '240'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/240/cases?engine=60053

---
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.