# NTSB Accident WPR11LA282
> **HILLER UH12E** · 2011-06-23 · Hanford, CA, USA · NONE
## Event
- **NTSB number:** WPR11LA282
- **Event ID:** 20110624X25540
- **Type:** Accident
- **Date:** 2011-06-23
- **Location:** Hanford, CA, USA
- **Coordinates:** 36.316665, -119.627502
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** HILLER
- **Model:** UH12E
- **Registration:** N99579
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

The separation of the tail rotor drive gear shaft due to torsional fatigue of its threaded portion, which resulted in a loss of tail rotor control.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR11LA282) · AI Analytics · CC0 1.0*