20070703011239A

(-23) The pilot stated that he was giving dual instruction to a student. He said that he and the student had previously conducted various maneuvers and that they were going to practice hovering autorotations. The pilot said that he demonstrated one to the student with the student following along on the controls. The pilot stated that he quizzed the student on his understanding of the manuever and the student said that he understood. The pilot stated that he was following on the controls when the student began the maneuver and instead of the student rolling the throttle off, he rolled it full on and pushed full forward on the right tail rotor pedal and the aircraft began a very rapid nose-high right turn and before he could regain control of the aircraft, the student pulled hard aft on the cyclic, the aircraft tail and skid heels hit the ground very hard and the next thing he knew he was trying to exit the aircraft. The aircraft came to rest on the helipad on its left side with the tail cone separated from the aircraft. The tail rotor assembly showed evidence of the blades striking the ground and separating from the aircraft. The landing gear was heavily damaged by the impact and partially separated from the aircraft.