The pilot had been undergoing a course in aerobatic flying. After completing 11.5 hours of dual aerobatic instruction, she had been authorised to carry out her first period of solo aerobatic manoeuvres. She was briefed to carry out two spins, followed by other basic manoeuvres, consisting of loops, stall turns, rolls and wing-overs. The aircraft was to operate in the designated training areas. About 8 minutes after the pilot reported entering one of the training areas, the aircraft was observed to be at a relatively low height, spiralling in a clockwise direction. Shortly afterwards it struck a group of large trees and dived to the ground. The damage sustained was consistent with a relatively high speed impact. No fault was subsequently found with the aircraft or its systems which might have contributed to the apparent loss of control. It is not known which manoeuvre the pilot was attempting at the time, but assuming that the briefed sequence was being followed, it is likely that the loss of control occurred during the spinning sequence. The factors leading to the development of the accident have not been determined.