# NTSB Accident WPR09CA375
> **ROBINSON HELICOPTER R22 BETA** · 2009-07-29 · Troutdale, OR, USA · MINR
## Event
- **NTSB number:** WPR09CA375
- **Event ID:** 20090729X43708
- **Type:** Accident
- **Date:** 2009-07-29
- **Location:** Troutdale, OR, USA
- **Coordinates:** 45.520244, -122.350593
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 2
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON HELICOPTER
- **Model:** R22 BETA
- **Registration:** N7176W
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The flight instructor's failure to maintain adequate main rotor RPM.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR09CA375) · AI Analytics · CC0 1.0*