The helicopter was engaged in a medical evacuation operation. A crewman was positioned on the ground to anchor a tag line, which was attached to a Stokes litter and was designed to prevent the litter from spinning during winching. The nature of the terrain was such that the line could not be positioned at the correct angle. Shortly after the winching operation commenced, the litter commenced to spin. As it neared the helicopter, the winch operator attempted to stop the spinning to enable the litter to be lifted on board. His right arm was broken when it became entangled in the litter straps.
