On October 11, 1992, a Bell 47-D1 (registration N162B) operated by Ochwatt, Robert & Edward was involved in an aviation accident near EL Monte, CA. Investigators recorded the probable cause as: THE PILOT'S FAILURE TO MAINTAIN THE ROTOR RPM. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter on a sightseeing flight experienced two power losses during a pinnacle landing to a hilltop plateau. After the first loss, power restored; during air taxi, second loss led to hard landing and rollover. Engine examination found no preexisting malfunction.
Incident Overview
During a local helicopter sightseeing flight, the pilot demonstrated a pinnacle landing to a hilltop plateau. As the pilot flared the helicopter, a loss of power occurred, forcing a landing on the edge of the hill. Engine power then restored, and the pilot lifted off and air taxied the helicopter toward the center of the plateau.
Second Power Loss and Rollover
While air taxiing, the engine again lost power. The helicopter then landed hard and rolled over.
Examination Findings
FAA inspectors conducted a wreckage examination and reported that the impact was consistent with a low rotor rpm hard landing. Examination of the engine disclosed no evidence of any preexisting malfunction or failure.