# NTSB Accident WPR10LA173
> **Williams Yakovlev YAK 3UPW** · 2010-03-22 · Half Moon Bay, CA, USA · NONE
## Event
- **NTSB number:** WPR10LA173
- **Event ID:** 20100322X85943
- **Type:** Accident
- **Date:** 2010-03-22
- **Location:** Half Moon Bay, CA, USA
- **Coordinates:** 37.51361, -122.501113
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Williams Yakovlev
- **Model:** YAK 3UPW
- **Registration:** N153U
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The failure of left main landing gear actuator to lock in the down position due to low down-lock pressure as a result of a contaminated down-lock track and corroded down-lock balls.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR10LA173) · AI Analytics · CC0 1.0*