What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Pilot was giving dual instruction. According to the pilot he was simulating an engine failure in order to instruct an autorotation. To accomplish this the instructor split the engine RPM and the rotor RPM to 2400 and 2900 respectively. According to the instructor the engine actually failed at that point. The instructor pilot said it went silent with no warning. The instructor pilot took over the controls and autorotated to a field. The field had high grass and an uneven surface. On touchdown the right skid dug into the ground and the helicopter rolled to its right and came to rest on its right side. The helicopter received substantial damage to its rotors, right skid and tail boom. The occupants were not injured. The post accident exam of the engine indicated no abnormalities.
As the FAA filed it
(-23) PILOT WAS GIVING DUAL INSTRUCTION. ACCORDING TO THE PILOT HE WAS SIMULATING AN ENGINE FAILURE IN ORDER TO INSTRUCT AN AUTOROTATION. TO ACCOMPLISH THIS THE INSTRUCTOR SPLIT THE ENGINE RPM AND THE ROTOR RPM TO 2400 AND 2900 RESPECTIVELY. ACCORDING TO THE INSTRUCTOR THE ENGINE ACTUALLY FAILED AT THAT POINT. THE INSTRUCTOR PILOT SAID IT WENT SILENT WITH NO WARNING. THE INSTRUCTOR PILOT TOOK OVER THE CONTROLS AND AUTOROTATED TO A FIELD. THE FIELD HAD HIGH GRASS AND AN UNEVEN SURFACE. ON TOUCHDOWN THE RIGHT SKID DUG INTO THE GROUND AND THE HELICOPTER ROLLED TO ITS RIGHT AND CAME TO REST ON ITS RIGHT SIDE. THE HELICOPTER RECEIVED SUBSTANTIAL DAMAGE TO ITS ROTORS, RIGHT SKID AND TAIL BOOM. THE OCCUPANTS WERE NOT INJURED. THE POST ACCIDENT EXAM OF THE ENGINE INDICATED NO ABNORMALITIES.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.