NTSB Identification: LAX92LA034.
The docket is stored on NTSB microfiche number 45875.
Accident occurred Friday, November 01, 1991 in RIVERSIDE, CA
Probable Cause Approval Date: 04/27/1993
Aircraft: ROBINSON R-22B, registration: N549SM
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE SOLO STUDENT WAS PRACTICING TAKEOFFS AND LANDINGS. WHILE DOWNWIND THE STUDENT SAID THE ENGINE RPM INDICATOR SUDDENLY PEGGED AT THE TOP OF THE GAUGE AND THE ROTOR RPM BEGAN RAPIDLY DECREASING. THE STUDENT INITIATED AN AUTO ROTATION. THE HELICOPTER LANDED HARD AND ROLLED OVER. EXAMINATION OF THE HELICOPTER BY FAA INSPECTORS REVEALED THAT THE FORWARD DRIVE BELT WAS SPLIT LONGITUDINALLY AND DISPLACED FROM THE TRANSMISSION PULLEY. THE AFT DRIVE BELT WAS FOUND OFF THE ENGINE AND TRANSMISSION PULLEYS. NO OTHER SYSTEM ABNORMALITIES WERE NOTED.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE FAILURE OF THE ENGINE TO TRANSMISSION DRIVE BELT AND THE PILOTS FAILURE TO CORRECTLY JUDGE OF THE LANDING FLARE DURING THE SUBSEQUENT AUTOROTATION.

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