Loss of separation involving a Boeing 747-438, VH-OJD and Piper PA-31-350, VH-MZX, Sydney, New South Wales, on 31 May 1993

The B747 VH-OJD departed runway 34 on runway heading and was cleared to 3000 feet. On contact with Sydney Departures VH-OJD was given a left turn heading 240 and was instructed on two occasions to maintain 3000 feet. The aircraft was observed to climb to 3400 feet, and this was confirmed by the pilot. VH-MZX, a PA31 had departed from runway 07 and had been cleared to 4000 feet on a heading of 030. Horizontal and vertical separation standards were infringed as there was only two miles lateral separation by radar between VH-OJD and VH-MZX. The required separation standards was 1000 feet vertically or three miles horizontally.