# NTSB Accident WPR11CA121
> **ROBINSON R44** · 2011-02-04 · Ogden, UT, USA · NONE
## Event
- **NTSB number:** WPR11CA121
- **Event ID:** 20110203X11204
- **Type:** Accident
- **Date:** 2011-02-04
- **Location:** Ogden, UT, USA
- **Coordinates:** 41.352222, -112.194168
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON
- **Model:** R44
- **Registration:** N441TB
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The certified flight instructor’s failure to maintain adequate main rotor blade rpm during a practice autorotation, resulting in a hard landing and rollover.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR11CA121) · AI Analytics · CC0 1.0*