# NTSB Accident CEN21LA216
> **AEROSPATIALE AS350 B2 ECUREUIL** · 2021-05-12 · Yukon, OK, USA · NONE
## Event
- **NTSB number:** CEN21LA216
- **Event ID:** 20210513103077
- **Type:** Accident
- **Date:** 2021-05-12
- **Location:** Yukon, OK, USA
- **Coordinates:** 35.491833, -97.821178
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** AEROSPATIALE
- **Model:** AS350 B2 ECUREUIL
- **Registration:** N841BP
- **FAR Part:** PUBU
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

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 control. Contributing was the pilot’s failure to relinquish control of the helicopter to the flight instructor when directed.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CEN21LA216) · AI Analytics · CC0 1.0*