NTSB Identification: DEN05LA042.
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Accident occurred Sunday, December 19, 2004 in Park City, UT
Probable Cause Approval Date: 06/08/2005
Aircraft: Robinson R22, registration: N993RW
Injuries: 2 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.

According to the flight instructor, the student was setting up an approach near the reservoir. The approach angle was too steep, so the student discontinued the approach. The instructor stated that during the second approach, approximately 20 feet above the ground, the helicopter began to yaw to the right. She stated that she took control of the helicopter as it yawed approximately 180 degrees around. She established a stabilized hover and at this time, the "low rotor horn and light came on." The instructor stated that she "lowered the collective and rolled on the throttle to try and get the horn off and the rpms back up." She stated that the rpm never dropped below 95 percent. Subsequently, the helicopter "dropped straight down and hit the ground level" causing substantial damage.

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

the student pilot's failure to maintain aircraft control, and the instructor's inadequate supervision by her failure to assure adequate rotor rpm was maintained.

Full narrative available

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