What happened
During a flight intended for dual instruction, a student pilot—who was a candidate for a Certified Flight Instructor (CFI) rating—was performing a practice 180-degree full touchdown autorotation. The student was in control of the aircraft during the maneuver.
As the maneuver progressed, the instructor observed that the airspeed had decreased and the main rotor RPM had become low. Although the instructor alerted the student to the low rotor RPM condition, the student failed to take decisive corrective action. Specifically, the student did not initiate a power recovery with enough time to prevent a low rotor RPM flare. This resulted in a hard touchdown and a subsequent rollover of the aircraft.
No occupants were reported injured during the event.