Loss of separation involving a The Boeing Company 727-277, VH-RMX and Unknown Helicopter, UNKNOWN, 8km S Avalon, VIC on 16 December 1994

VH-RMX was making touch-and-go landings at Avalon and was on the crosswind leg for runway 18 at an altitude of 1400 ft when the pilot reported a helicopter passing beneath him tracking in the opposite direction. Melbourne radar confirmed an aircraft squawking code 2100 half a mile inside the Avalon control zone tracking towards Geelong at 1100 ft. The helicopter did not respond to calls and faded from radar 90 km southwest of Avalon.