# NTSB Accident WPR13FA243
> **HILLER UH-12E** · 2013-05-26 · Wenatchee, WA, USA · MINR
## Event
- **NTSB number:** WPR13FA243
- **Event ID:** 20130526X13738
- **Type:** Accident
- **Date:** 2013-05-26
- **Location:** Wenatchee, WA, USA
- **Coordinates:** 47.392223, -120.203613
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 1
- **Total aboard:** 2
## Aircraft
- **Make:** HILLER
- **Model:** UH-12E
- **Registration:** N99090
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

Fatigue failure of the six bolts that secured the bevel gear to the first stage planetary carrier, which caused the transmission to seize while the helicopter and main rotor were still operating.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR13FA243) · AI Analytics · CC0 1.0*