# NTSB Accident DEN99LA168
> **Bell 47G3B2A** · 1999-09-23 · TREMONTON, UT, USA · NONE
## Event
- **NTSB number:** DEN99LA168
- **Event ID:** 20001212X19745
- **Type:** Accident
- **Date:** 1999-09-23
- **Location:** TREMONTON, UT, USA
- **Coordinates:** 41.690769, -112.269325
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** Bell
- **Model:** 47G3B2A
- **Registration:** N83246
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's failure to maintain rotor rpm while attempting a precautionary autorotation landing.  A factor was the loss of engine power for undetermined reasons.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN99LA168) · AI Analytics · CC0 1.0*