What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Pilot experienced yaw oscillation approximately 15 minutes into the flight. Pilot began descending for a precautionary landing but before he reached the intended landing site the low rotor RPM horn and low rotor light illuminated followed by an engine/rotor overspeed as the collective was lowered. Pilot executed a 180 degree turn into the wind from approximately 800 ft. AGL to a clearing on the hillside.
As the FAA filed it
(-23) PILOT EXPERIENCED YAW OSCILLATION APPROXIMATELY 15 MINUTES INTO THE FLIGHT. PILOT BEGAN DESCENDING FOR A PRECAUTIONARY LANDING BUT BEFORE HE REACHED THE INTENDED LANDING SITE THE LOW ROTOR RPM HORN AND LOW ROTOR LIGHT ILLUMINATED FOLLOWED BY AN ENGINE/ROTOR OVERSPEED AS THE COLLECTIVE WAS LOWERED. PILOT EXECUTED A 180 DEGREE TURN INTO THE WIND FROM APPROXIMATELY 800 FT. AGL TO A CLEARING ON THE HILLSIDE.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.