Incident Overview
A helicopter was executing a normal approach to the ground when, as it neared the ground, the ventral fin struck the ground. This contact caused the tail rotor driveshaft to re-center, producing a shudder that the pilot interpreted as a tail rotor failure. In response, the pilot landed the helicopter hard with forward ground speed.
Sequence of Events
Upon touchdown, the aircraft rocked forward, causing the main rotor blades to strike the ground. As the aircraft then rocked back, the main rotor blades slapped against the tailboom.
Outcome
The helicopter sustained damage from the ground contacts, but no further details are available. The pilot's perception of a tail rotor failure prompted the hard landing, though the initial strike of the ventral fin with the ground was the triggering event.