NTSB Identification: LAX07CA050.
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Accident occurred Monday, November 27, 2006 in Redding, CA
Probable Cause Approval Date: 02/26/2007
Aircraft: Robinson R22B, registration: N7198N
Injuries: 2 Uninjured.
NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.
The helicopter touched down hard at the culmination of a practice autorotation. During the instructional flight lesson, the certified flight instructor (CFI) monitored his student's flying. The student had about 15 hours of total helicopter flying experience. The CFI reported that the student initiated the landing flare about 40 feet above ground level (agl). According to the CFI, when the helicopter was about 10 feet agl he took over the controls, raised the collective, and rolled on the throttle to initiate a power recovery. The helicopter's low rotor warning horn sounded and the respective annunciator light illuminated. Thereafter, the helicopter contacted the ground, bounced, and came to rest after making two complete rotations about its vertical axis. The tailboom and vertical stabilizer were bent during the ground impact sequence. No mechanical malfunction or failure was reported to have occurred.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The student's misjudged landing flare, the instructor's inadequate supervision of the flight, and the instructor's failure to maintain adequate rotor rpm. Full narrative available
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