# NTSB Accident LAX91LA079
> **ROBINSON R-22 HP** · 1991-01-25 · SCOTTSDALE, AZ, USA · NONE
## Event
- **NTSB number:** LAX91LA079
- **Event ID:** 20001212X16339
- **Type:** Accident
- **Date:** 1991-01-25
- **Location:** SCOTTSDALE, AZ, USA
- **Coordinates:** 33.610881, -111.890846
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** ROBINSON
- **Model:** R-22 HP
- **Registration:** N21439
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE FAILURE OF THE DRIVE BELTS DUE TO EXCESSIVE WEAR OF THE CLUTCH ASSEMBLY UPPER SHEAVE AND THE PILOT'S INACCURATE FLARE DURING THE TERMINATION OF THE AUTOROTATION.  A FACTOR IN THE ACCIDENT WAS THE INADEQUATE DESIGN OF THE CLUTCH ASSEMBLY UPPER SHEAVE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX91LA079) · AI Analytics · CC0 1.0*