# Accident 19910125001109A: Robsin R22, Scottsdale, AZ, January 25, 1991

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: January 25, 1991, 08:40 local time
- Place: Scottsdale, AZ
- Airport: Scottsdale Municipal Airport
- Damage: Substantial damage
- Phase of flight: Pwr Off Vert Land/Autorotate
- Operating rules: General operating rules (Part 91)
- Location: 33.6109° N, 111.8908° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=33.6109&lon=-111.8908&mi=10
- Aircraft: N21439, a cancelled registration (https://openairdocs.org/deregistered/N21439-1994-02-04) (OpenAirDocs)
- Registry model: Robinson Helicopter R22 (registry code 7640102, https://openairdocs.org/model/robinson-helicopter-r22) (OpenAirDocs)
- Reported make and model: ROBSIN R22
- Reported engine: LYC O320B2C
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 58 total, 58 in this make and model, 58 in the last 90 days
- NTSB investigation: [NTSB LAX91LA079](https://openairdocs.org/ntsb/LAX91LA079) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19910125001109A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ROTOR DRIVE BELTS CAME OFF PULLEY. AUTOROTATED BUT ENTERED DYNAMIC ROLLOVER ON LANDING. BELTS WORN FROM GRITTY SAND

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX91LA079](https://openairdocs.org/ntsb/LAX91LA079), Jan 25, 1991: Robinson R-22 HP (N21439), Scottsdale, AZ, substantial damage. 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…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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