# NTSB Accident WPR09CA173
> **ROBINSON HELICOPTER R22 BETA** · 2009-03-30 · Chandler, AZ, USA · NONE
## Event
- **NTSB number:** WPR09CA173
- **Event ID:** 20090330X74837
- **Type:** Accident
- **Date:** 2009-03-30
- **Location:** Chandler, AZ, USA
- **Coordinates:** 33.26889, -111.811111
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON HELICOPTER
- **Model:** R22 BETA
- **Registration:** N74815
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The certified flight instructor's inadequate supervision of the student pilot during a hover demonstration and his subsequent loss of helicopter control that resulted in a dynamic rollover.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR09CA173) · AI Analytics · CC0 1.0*