Summary
A flight instructor reported that during an instructional flight, an autorotation practice led to a hard landing that damaged the helicopter. The incident occurred when the throttle was rolled off to simulate an engine failure, but the student pilot did not respond correctly, prompting the instructor to intervene. The subsequent landing resulted in deformation of both skids and substantial damage to the airframe.
Narrative
According to the instructor, the helicopter was at 500 feet above ground level when he reduced the throttle with the intention of having the student perform a straight-in autorotation. The student pilot failed to respond appropriately, so the instructor took control to initiate a power recovery. However, the helicopter landed hard, causing damage to the landing gear and structure.
Damage
The hard landing deformed both skids and substantially damaged the airframe. The specific extent of damage was not detailed beyond noting the structural deformation.
Mechanical Condition
The pilot reported no preimpact mechanical malfunctions or failures with the helicopter that would have precluded normal operation. The helicopter was considered airworthy before the event.