Primary finding
Probable cause
The flight instructor's improper flare resulting in a hard landing and main rotor contact with tail boom.
Investigator assessment
Analysis narrative
The instructor stated that while performing autorotation with a student, he began with an entry of 600 feet in a steady state autorotation. The deceleration was normal and upon termination of the maneuver. He felt a small vibration and saw a piece of metal fly over and to the front of the helicopter. He immediately closed the throttle and shut down the helicopter. He exited and saw the tail section had been damaged.
Source record
Factual narrative
This report is based on information received by the NTSB. Additional details may be found in the NTSB's public docket for this case. For further information, please contact the NTSB Office of Public Inquiries.