NTSB Identification: SEA06CA160.
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Accident occurred Friday, August 11, 2006 in Boise, ID
Probable Cause Approval Date: 11/29/2006
Aircraft: Robinson R-22B, registration: N228SH
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.

While demonstrating a 180 degree autorotation to landing, the instructor pilot inadvertently allowed the helicopter to attain an excessive rate of descent. Although he added power and initiated a go-around, he had waited too long to begin the go-around, and he was unable to keep the helicopter from impacting the end of the runway and bouncing back into the air. After hover-taxiing to parking, the instructor inspected the helicopter, whereupon it was determined it had sustained substantial damage.

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

The instructor pilot's inadvertent excessive descent rate, and his delay of remedial action during the demonstration of a 180 degree autorotation.

Full narrative available

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