THE PASSENGERS AND THE PILOT BOARDED THE HELICOPTER, WHICH WAS PARKED ON THE FEREBEE GLACIER'S SURFACE. AFTER EVERYONE WAS STRAPPED INTO THEIR SEATS, THE HELICOPTER BEGAN SLIDING FORWARD ON THE ICE AND GAINING SPEED. THE PILOT STATED THE SPEED DID NOT EXCEED A BRISK WALK. THE HELICOPTER TURNED LEFT AS IT WAS SLIDING AND THE NOSE OF THE HELICOPTER ROLLED INTO A DEPRESSION. THE HELICOPTER ROLLED ONTO ITS LEFT SIDE. THE ENGINE WAS NOT RUNNING AND THE ROTORS WERE NOT TURNING.