Primary finding
Probable cause
The flight instructor's failure to adequately supervise the conduct of the flight and the failure of the flying pilot to ensure that adequate ground clearance existed between the stinger/tail rotor and the ground during a deceleration while the aircraft was maneuvering for a practice forced landing. The identity of the flying pilot could not be determined. The instructor's decision to perform the maneuver with a gusty, surface tailwind was a factor in this accident.