Accident Overview
A helicopter crashed during a high-speed descent while in a slight nose-low and left bank attitude. The aircraft had been circling at an altitude of approximately 600 feet MSL, awaiting clearance to land.
Pilot Account
The pilot in command (PIC), who was seated in the left seat and was not flying the aircraft at the time, reported that he felt no yaw or change in sound. He stated that suddenly the ground was coming up and he thought he observed low rotor RPM. The next thing he remembers is being on the ground on his back in pain.
Wreckage Examination
Examination of the wreckage confirmed that neither the engine nor the rotors were operating at impact. However, investigation revealed that the engine and all of its accessories were capable of normal operation prior to ground impact.
Investigation Findings
No probable cause was determined from the available information.