# NTSB Accident LAX94LA017
> **AEROSPATIALE SA-315** · 1993-10-18 · BECKWOURTH, CA, USA · SERS
## Event
- **NTSB number:** LAX94LA017
- **Event ID:** 20001211X13594
- **Type:** Accident
- **Date:** 1993-10-18
- **Location:** BECKWOURTH, CA, USA
- **Coordinates:** 39.660217, -120.430229
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** AEROSPATIALE
- **Model:** SA-315
- **Registration:** N49511
- **FAR Part:** 133
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NR
- **Weather:** VMC
## Probable cause

was the worn collective servo causing a hydraulic lock and not allowing the pilot to lower the collective.  This condition caused the main rotor blades rpm to decay.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX94LA017) · AI Analytics · CC0 1.0*