What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The pilot in charge, privacy data omitted, was executing and demonstrating a planned 180 autorotation. As the helicopter descended approximately 200 feet from its starting point of 700 feet, and at the 45 degree point, it became uncontrollable in pitch attitude. The aircraft hit tail low, followed by the main body, prior to reaching the runway. Both pilots said they had been experiencing a substantial vibration prior to loss of control.
Weather was not a factor, however, chris had not flown an R22 in nearly one year, and not at an elevation above 5000 feet. Most of his Robinson is in the R44, which has significantly different flight characteristics. Neither pilot had flown N47WH before this flight.
As the FAA filed it
THE PILOT IN CHARGE, ^PRIVACY DATA OMITTED^, WAS EXECUTING AND DEMONSTRATING A PLANNED 180 AUTOROTATION. AS THE HELICOPTER DESCENDED APPROXIMATELY 200 FEET FROM ITS STARTING POINT OF 700 FEET, AND AT THE 45 DEGREE POINT, IT BECAME UNCONTROLLABLE IN PITCH ATTITUDE. THE AIRCRAFT HIT TAIL LOW, FOLLOWED BY THE MAIN BODY, PRIOR TO REACHING THE RUNWAY. BOTH PILOTS SAID THEY HAD BEEN EXPERIENCING A SUBSTANTIAL VIBRATION PRIOR TO LOSS OF CONTROL.
WEATHER WAS NOT A FACTOR, HOWEVER, CHRIS HAD NOT FLOWN AN R22 IN NEARLY ONE YEAR, AND NOT AT AN ELEVATION ABOVE 5000 FEET. MOST OF HIS ROBINSON IS IN THE R44, WHICH HAS SIGNIFICANTLY DIFFERENT FLIGHT CHARACTERISTICS. NEITHER PILOT HAD FLOWN N47WH BEFORE THIS FLIGHT.