What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On approach at 75 ft & 45 mph, engine quit. Lowered collective, accelerated to 65 mph and power-off autorotated to a firm landing. Right skid collapsed as the rotor stopped. No other damage to aircraft, no injuries to solo pilot. It is surmised that the pilot's headset battery pack hit the engine kill-switch, that did not have its' kill-switch guard in the guarded position. Engine started and ran normally as observed by FAA iic.
As the FAA filed it
ON APPROACH AT 75 FT & 45 MPH, ENGINE QUIT. LOWERED COLLECTIVE, ACCELERATED TO 65 MPH AND POWER-OFF AUTOROTATED TO A FIRM LANDING. RIGHT SKID COLLAPSED AS THE ROTOR STOPPED. NO OTHER DAMAGE TO AIRCRAFT, NO INJURIES TO SOLO PILOT. IT IS SURMISED THAT THE PILOT'S HEADSET BATTERY PACK HIT THE ENGINE KILL-SWITCH, THAT DID NOT HAVE ITS' KILL-SWITCH GUARD IN THE GUARDED POSITION. ENGINE STARTED AND RAN NORMALLY AS OBSERVED BY FAA IIC.