The pilot of the Bell 206L-4 helicopter had completed a simulated engine failure, and was bringing the helicopter to a hover over a grass area, when it impacted the ground from an altitude of approximately 5 feet. The helicopter's tail boom, aft of its attach point was wrinkled, and the tail boom sagged. The pilot stated he did not experience any mechanical problems with the helicopter. He reported 2,029 hours of total flight experience, which included 1,929 hours in rotorcraft, all in the same make and model as the accident helicopter. Winds reported at the airport, about the time of the accident, were variable at 7 knots.