NTSB Identification: LAX02FA088.
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Accident occurred Thursday, February 21, 2002 in Glendora, CA
Probable Cause Approval Date: 09/29/2004
Aircraft: Robinson R22 Beta, registration: N8045K
Injuries: 2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

The helicopter rolled over following an autorotative landing on a sloped mountain side. According to the pilot's statements, during the flight, the student had failed to maintain adequate main rotor rpm while orbiting a mountain peak, and the helicopter entered a descent. The student relinquished the controls to the certified flight instructor (CFI); however, he was unsuccessful at restoring the requisite rpm, so he autorotated to a landing downsloping mountainous terrain. Thereafter, the helicopter rolled over. Neither pilot reported having heard the low rotor rpm warning horn, observed illumination of any annunciator light, or felt any unusual vibration. During the subsequent wreckage examination, the low rotor rpm warning systems were found functional. No evidence of any preimpact mechanical malfunction was found with the airframe or drive system. The engine was run up to full power, and no malfunctions were noted. During the accident flight, the helicopter was operating near its maximum certificated gross weight and under a high density altitude (over 4,300 feet) condition.

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

The student's failure to maintain adequate main rotor rpm, and the flight instructor's inadequate supervision. Contributing factors were the high helicopter gross weight and density altitude, and the descending mountainous terrain.

Full narrative available

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