Accident Details
Probable Cause and Findings
An excessive descent rate during a simulated 180-degree power-off autorotation, and the flight instructor's failure to initiate corrective action in time to keep the helicopter from impacting the terrain.
Aircraft Information
Registered Owner (Historical)
Analysis
While demonstrating a practice 180-degree autorotation to landing, the certified flight instructor allowed the helicopter to develop an excessive descent rate and low rotor rpm, which resulted in a hard landing. Although he attempted to take corrective action, he did not do so in time to keep the helicopter from contacting the asphalt surface with sufficient force to result in substantial damage to the helicopters airframe. Examination of the helicopter revealed no mechanical anomalies.
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# SEA08CA032