# NTSB Accident LAX04LA035
> **Eurocopter AS350 B3** · 2003-11-04 · Mesa, AZ, USA · NONE
## Event
- **NTSB number:** LAX04LA035
- **Event ID:** 20031112X01883
- **Type:** Accident
- **Date:** 2003-11-04
- **Location:** Mesa, AZ, USA
- **Coordinates:** 33.460834, -111.728332
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 4
- **Total aboard:** 4
## Aircraft
- **Make:** Eurocopter
- **Model:** AS350 B3
- **Registration:** N820NA
- **FAR Part:** 135
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's inadvertent activation of the hydraulic test switch, which resulted in a loss of the hydraulic system pressure, and his failure to maintain directional control.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX04LA035) · AI Analytics · CC0 1.0*