Loss of separation involving a Cessna Aircraft Company 172P, VH-AUC and Piper Aircraft Corp PA-34-200T, VH-DIG, 6km S Perth, WA on 2 December 1993

The two aircraft were vectored by Perth Approach and given appropriate clearances to facilitate their relative arrivals at Jandakot from Perth. VH-AUC climbed to a higher altitude than cleared and caused a separation breakdown. The pilot in command of this aircraft was an instructor and had the other aircraft sighted, but allowed her concentration to lapse and did not detect that her student had climbed in contravention of their airways clearance.