What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Vibration on approach. Nosed down. Impacted nose first. Rolled over. Rotor control push rod came off. Lost cyclic. (-23) pilot stated he experienced a 1 to 1 vertical vibration on final. He started a deceleration at 50 feet. The nose of the helicopter tucked down and the helicopter collided with the ground in a nose down attitude and rolled over on its right side. Examination of the helicopter revealed that a flight control push rod became disconnected from the control yoke teeter block resulting in a partial loss of cyclic control. (.4) the pilot stated he was on base turn to final for a fly bye, when he experienced a 1 to 1 vertical vibration. He informed the tower that he was going to land, and started a deceleration. The helicopter veered to the right, and the pilot applied left antitorque pedal. The nose started to tuck down, then the helicopter collided with the ground and rolled over on its right side. Examination of the helicopter flight control system revealed a hex nut backed off the cyclic flight control push rod bolt, and the bolt became disconnected from the control yoke teeter block. This resulted in a loss of cyclic control.
As the FAA filed it
VIBRATION ON APPROACH. NOSED DOWN. IMPACTED NOSE FIRST. ROLLED OVER. ROTOR CONTROL PUSH ROD CAME OFF. LOST CYCLIC. (-23) PILOT STATED HE EXPERIENCED A 1 TO 1 VERTICAL VIBRATION ON FINAL. HE STARTED A DECELERATION AT 50 FEET. THE NOSE OF THE HELICOPTER TUCKED DOWN AND THE HELICOPTER COLLIDED WITH THE GROUND IN A NOSE DOWN ATTITUDE AND ROLLED OVER ON ITS RIGHT SIDE. EXAMINATION OF THE HELICOPTER REVEALED THAT A FLIGHT CONTROL PUSH ROD BECAME DISCONNECTED FROM THE CONTROL YOKE TEETER BLOCK RESULTING IN A PARTIAL LOSS OF CYCLIC CONTROL. (.4) THE PILOT STATED HE WAS ON BASE TURN TO FINAL FOR A FLY BYE, WHEN HE EXPERIENCED A 1 TO 1 VERTICAL VIBRATION. HE INFORMED THE TOWER THAT HE WAS GOING TO LAND, AND STARTED A DECELERATION. THE HELICOPTER VEERED TO THE RIGHT, AND THE PILOT APPLIED LEFT ANTITORQUE PEDAL. THE NOSE STARTED TO TUCK DOWN, THEN THE HELICOPTER COLLIDED WITH THE GROUND AND ROLLED OVER ON ITS RIGHT SIDE. EXAMINATION OF THE HELICOPTER FLIGHT CONTROL SYSTEM REVEALED A HEX NUT BACKED OFF THE CYCLIC FLIGHT CONTROL PUSH ROD BOLT, AND THE BOLT BECAME DISCONNECTED FROM THE CONTROL YOKE TEETER BLOCK. THIS RESULTED IN A LOSS OF CYCLIC CONTROL.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.