What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The helicopter was leased from a part 135 operator to the sheriffs department for air support operations. Sheriffs department personnel were operating the aircraft. The aircrew (a pilot in command and a tactical flight officer) entered the aircraft and began startup procedures before the main rotor blade tie downs had been removed.
After the engine started the main rotor blades began to rotate and allowed the tie down strap and metal apparatus to damage the main rotor, the tail rotor and structures at the rear of the aircraft.
As the FAA filed it
THE HELICOPTER WAS LEASED FROM A PART 135 OPERATOR TO THE SHERIFFS DEPARTMENT FOR AIR SUPPORT OPERATIONS. SHERIFFS DEPARTMENT PERSONNEL WERE OPERATING THE AIRCRAFT. THE AIRCREW (A PILOT IN COMMAND AND A TACTICAL FLIGHT OFFICER) ENTERED THE AIRCRAFT AND BEGAN STARTUP PROCEDURES BEFORE THE MAIN ROTOR BLADE TIE DOWNS HAD BEEN REMOVED.
AFTER THE ENGINE STARTED THE MAIN ROTOR BLADES BEGAN TO ROTATE AND ALLOWED THE TIE DOWN STRAP AND METAL APPARATUS TO DAMAGE THE MAIN ROTOR, THE TAIL ROTOR AND STRUCTURES AT THE REAR OF THE AIRCRAFT.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.