What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
During level flight, engine throttle control cable came apart causing throttle to be stuck at 25'' manifold pressure. Pilot was unable to decend without overspeeding engine and rotor. Pilot applied carburetor heat and shut off one magneto to reduce power as much as possible. Pilot slipped helicopter and made steep turns to reduce altitude. At 150 feet AGL pilot turned off ignition and executed an auto rotation landing on runway 9. Helicopter landed hard causing main rotor to contact tail boom damaging both.
As the FAA filed it
DURING LEVEL FLIGHT, ENGINE THROTTLE CONTROL CABLE CAME APART CAUSING THROTTLE TO BE STUCK AT 25'' MANIFOLD PRESSURE. PILOT WAS UNABLE TO DECEND WITHOUT OVERSPEEDING ENGINE AND ROTOR. PILOT APPLIED CARBURETOR HEAT AND SHUT OFF ONE MAGNETO TO REDUCE POWER AS MUCH AS POSSIBLE. PILOT SLIPPED HELICOPTER AND MADE STEEP TURNS TO REDUCE ALTITUDE. AT 150 FEET AGL PILOT TURNED OFF IGNITION AND EXECUTED AN AUTO ROTATION LANDING ON RUNWAY 9. HELICOPTER LANDED HARD CAUSING MAIN ROTOR TO CONTACT TAIL BOOM DAMAGING BOTH.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.