# NTSB Accident WPR12LA039
> **WILLIAMS HELICOPTER CORP UH-1H** · 2011-11-15 · Grand Canyon, AZ, USA · SERS
## Event
- **NTSB number:** WPR12LA039
- **Event ID:** 20111116X32140
- **Type:** Accident
- **Date:** 2011-11-15
- **Location:** Grand Canyon, AZ, USA
- **Coordinates:** 35.710556, -112.213607
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** WILLIAMS HELICOPTER CORP
- **Model:** UH-1H
- **Registration:** N502AW
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The loss of main rotor power due to a main rotor transmission failure from a lack of lubrication.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR12LA039) · AI Analytics · CC0 1.0*