Incident Description
During a practice hovering autorotation, a helicopter impacted the terrain and rolled over. The event occurred on the third attempt at the maneuver. The pilot undergoing instruction (PUI) and a certified flight instructor (CFI) had stabilized the helicopter in a 2-foot hover.
Sequence of Events
The PUI counted down "three, two, and one" and entered the maneuver. However, he increased the throttle instead of retarding it and simultaneously added full right antitorque pedal. The helicopter began to rapidly yaw to the right. The CFI then retarded the throttle and tried to overcome the PUI's right antitorque pedal input. At that point, the helicopter was starting to descend, and the right yawing motion was beginning to slow down. As the helicopter descended toward terrain, the low rotor rpm horn and light activated. The CFI lowered the collective in an attempt to stop the descent. Shortly thereafter, the helicopter impacted the terrain and rolled over on its right side, facing 180 degrees from the initial starting point.
Damage
The resulting damage included the main rotor blades, tail rotor blades, and tail boom. The pilot stated that the helicopter and engine had no mechanical failures or malfunctions during the flight.