WHILE AT GROUND IDLE AFTER DROPPING OFF A SURVEY CREW, THE PILOT OBSERVED THAT THE RIGHT SKID HAD SUNK INTO THE SOFT TUNDRA. WHILE ATTEMPTING TO FREE THE SKID AT FULL RPM THE HELICOPTER ROLLED RIGHT 90 DEG AND THE MAIN ROTOR STRUCK THE GROUND.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
Index for Jul1990 | Index of months