# NTSB Accident WPR11LA469
> **BELL 47D1** · 2011-09-27 · Ahwahnee, CA, USA · SERS
## Event
- **NTSB number:** WPR11LA469
- **Event ID:** 20110927X71137
- **Type:** Accident
- **Date:** 2011-09-27
- **Location:** Ahwahnee, CA, USA
- **Coordinates:** 37.407501, -119.723335
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** BELL
- **Model:** 47D1
- **Registration:** N9158R
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot’s failure to maintain adequate main rotor rpm during the landing approach, which resulted in a loss of control.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR11LA469) · AI Analytics · CC0 1.0*