What happened
During a normal approach, the pilot observed a slight rotor droop. Following this observation, the tail of the helicopter snapped to the left, and the aircraft began rotating clockwise. At this time, the low rotor RPM warning activated.
In an attempt to reduce the descent rate, the pilot pushed the cyclic forward and applied up collective. However, the pilot reported being unable to apply additional forward cyclic input because other aircraft were operating in the nearby vicinity. The helicopter subsequently impacted the ramp in an upright attitude. The impact caused the right skid to collapse further than the left skid, and the tail rotor struck the ground, resulting in a cracked tail boom.
Findings
The investigation determined that the impact resulted in the collapse of the right skid and damage to the tail boom.