What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)Accident occurred during the performance of a practice 180 degree autorotational maneuver into a remote flood retention basin. The rotor RPM was all allowed to decay during the deceleration and flare phase of the autorotation which was the cause for the hard landing. Hard landing did occur at the base of slopping terrain subsequently causing the aircraft to roll upon its left side.
As the FAA filed it
(-23)ACCIDENT OCCURRED DURING THE PERFORMANCE OF A PRACTICE 180 DEGREE AUTOROTATIONAL MANEUVER INTO A REMOTE FLOOD RETENTION BASIN. THE ROTOR RPM WAS ALL ALLOWED TO DECAY DURING THE DECELERATION AND FLARE PHASE OF THE AUTOROTATION WHICH WAS THE CAUSE FOR THE HARD LANDING. HARD LANDING DID OCCUR AT THE BASE OF SLOPPING TERRAIN SUBSEQUENTLY CAUSING THE AIRCRAFT TO ROLL UPON ITS LEFT SIDE.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.