# NTSB Accident WPR16FA040
> **AIRBUS Helicopters AS350** · 2015-12-16 · Superior, AZ, USA · FATL
## Event
- **NTSB number:** WPR16FA040
- **Event ID:** 20151216X13718
- **Type:** Accident
- **Date:** 2015-12-16
- **Location:** Superior, AZ, USA
- **Coordinates:** 33.425277, -111.154724
## Injuries
- **Highest injury:** FATL
- **Fatal:** 2
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 3
## Aircraft
- **Make:** AIRBUS Helicopters
- **Model:** AS350
- **Registration:** N74317
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's loss of helicopter control in mountainous terrain as the result of operating the helicopter outside the performance envelope of its hydraulic system and encountering the servo transparency phenomenon. Contributing to the accident was the pilot's decision to perform low-level, high-speed maneuvers through mountainous terrain.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR16FA040) · AI Analytics · CC0 1.0*