What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Student and instructor were practicing 180 autorotations. The density altitude was 1800 feet above field elevation with temperatures in the upper 90S. The student was performing the 180 autorotation when he tried to complete the final turn to low and with to high a bank angle. The instructor was too late with the power recovery and the helicopter hit the grass area beside the runway. The helicopter slid and rolled over with no injuries to instructor or student.
As the FAA filed it
STUDENT AND INSTRUCTOR WERE PRACTICING 180 AUTOROTATIONS. THE DENSITY ALTITUDE WAS 1800 FEET ABOVE FIELD ELEVATION WITH TEMPERATURES IN THE UPPER 90S. THE STUDENT WAS PERFORMING THE 180 AUTOROTATION WHEN HE TRIED TO COMPLETE THE FINAL TURN TO LOW AND WITH TO HIGH A BANK ANGLE. THE INSTRUCTOR WAS TOO LATE WITH THE POWER RECOVERY AND THE HELICOPTER HIT THE GRASS AREA BESIDE THE RUNWAY. THE HELICOPTER SLID AND ROLLED OVER WITH NO INJURIES TO INSTRUCTOR OR STUDENT.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.