Operational non-compliance involving a Piper PA-28R-200, VH-KGP and Piper PA-28-140, VH-RQF, Parafield Aerodrome, South Australia, on 28 March 1996

The pilot of VH-RQF reported "ready" for runway 03L and was instructed by the air traffic controller to line up. The pilot of VH-KGP, conducting crosswind landing practice on runway 08L, received a clearance for a touch-and-go landing.

The air traffic controller observed VH-KGP complete the landing and commence to take-off. He then noticed that VH-RQF was also taking off and attempted to instruct the pilot to stop but used the call sign of another aircraft operating in the circuit area, with the result that the instruction was ignored.

As both aircraft became airborne the air traffic controller gave a warning to the pilot of VH-KGP, who then saw VH-RQF and dived to pass beneath it. Both aircraft had climbed to about 100 ft above ground level and passed at the intersection of the two runways.

The pilot of VH-RQF stated that he had been involved in discussing the take-off technique with the student pilot, and thought he heard his take off clearance being given. When airborne he saw VH-KGP, and noticed that it had commenced to descend, so he climbed his aircraft as steep as possible to increase separation.