VH-AJJ, a Westwind, departed Sydney runway 16L on a COOKS ONE standard instrument departure (SID) for a maintenance test flight. The SID required the aircraft to turn left on reaching 500 ft. Radar observation, however, indicated that the aircraft remained on runway heading and did not comply with the SID. The departures controller instructed the pilot to turn left immediately as there was an international B747 departing from runway 16R on a GUEST TWO SID. The tower had both aircraft in sight at all times but there was a breakdown in separation.
The operator of VH-AJJ reported that the flight test was to observe the operation of the aircraft's pressurisation system. The pilot was aware of the departing B747 from the parallel runway but was intent on cabin and engine instruments during the initial climb. He realised he had failed to comply with the SID when he was instructed to turn left.
