# NTSB Accident DEN05LA137
> **Bell 47G-3B-1** · 2005-09-13 · Rock Springs, WY, USA · NONE
## Event
- **NTSB number:** DEN05LA137
- **Event ID:** 20051007X01601
- **Type:** Accident
- **Date:** 2005-09-13
- **Location:** Rock Springs, WY, USA
- **Coordinates:** 41.602779, -109.074996
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Bell
- **Model:** 47G-3B-1
- **Registration:** N24SD
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

the pilot's failure to maintain control of the helicopter during the attempted autorotation after he experienced an engine overspeed that occurred for reasons undetermined.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN05LA137) · AI Analytics · CC0 1.0*