Incident Overview
A helicopter parked on the surface of Ferebee Glacier experienced an unexpected slide after passengers and the pilot had boarded and strapped into their seats. The aircraft, with its engine not running and rotors not turning, began moving forward across the ice.
Sequence of Events
After everyone was seated and secured, the helicopter started sliding forward on the glacial ice, gradually gaining speed. According to the pilot, the forward speed did not exceed that of a brisk walk. During the slide, the helicopter yawed to the left. The nose of the aircraft then rolled into a depression in the glacier's surface. As a result, the helicopter continued its motion and rolled onto its left side.
Outcome
The helicopter came to rest on its left side on the glacier. The engine remained off throughout the event, and the rotor blades were not turning. No further details about the aircraft or occupants were provided in the source.