Incident Narrative
The pilot stated that while performing a stuck left pedal maneuver, the helicopter was flown with a 5-degree yaw to the left. As airspeed decreased to zero, the collective was brought in to bring the nose around, resulting in light contact with the ground. Subsequently, ground resonance started and progressed so rapidly that the helicopter destroyed itself almost immediately. The helicopter was destroyed.
Pilot Actions
The pilot reported that he had stopped three times during the flight to re-phase the main rotor system.
Post-Accident Examination
Examination of the three blade friction dampers after the accident revealed evidence that suggests the majority of the bronze plates inside the dampers were worn beyond acceptable limits.