What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Substantial damage was sustained after a hard landing during an instructional flight. The flight instructor and student pilot were practicing autorotations. They were practicing multiple straight-in autorotations and then initiated one from a 180-degree turn. During the turning maneuver, the main rotor RPM decayed and the helicopter's decent rate increased; the helicopter subsequently touched down hard and the left skid collapsed and then caused the aircraft to roll and come to a stop after 90 feet.
As the FAA filed it
SUBSTANTIAL DAMAGE WAS SUSTAINED AFTER A HARD LANDING DURING AN INSTRUCTIONAL FLIGHT. THE FLIGHT INSTRUCTOR AND STUDENT PILOT WERE PRACTICING AUTOROTATIONS. THEY WERE PRACTICING MULTIPLE STRAIGHT-IN AUTOROTATIONS AND THEN INITIATED ONE FROM A 180-DEGREE TURN. DURING THE TURNING MANEUVER, THE MAIN ROTOR RPM DECAYED AND THE HELICOPTER'S DECENT RATE INCREASED; THE HELICOPTER SUBSEQUENTLY TOUCHED DOWN HARD AND THE LEFT SKID COLLAPSED AND THEN CAUSED THE AIRCRAFT TO ROLL AND COME TO A STOP AFTER 90 FEET.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.