During a sheep mustering operation the aircraft was being orbited at about 200 feet agl and with 15 to 20 degrees of bank applied. During the orbiting the left wing struck the ground, the aircraft nosed-over and the engine was torn from its mountings. In the previous week the pilots normal sleep pattern had been broken. On the morning of the accident, he arose before dawn after having about five and a half hours rest. He had moved two large mobs of sheep into another paddock, which requires a high degree of concentration, and was orbiting whilst waiting for the last small mob to pass through the gate. It was at this stage, when the task required less concentration, that the pilot said, that he relaxed and fell asleep.
