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Summary

Summary

On 17 July 2004, at about 1619 eastern standard time, a Boeing Company 737-476 (737), registered VH-TJH, was inbound to Hamilton Island from the south-east for a landing on runway 14. The Hamilton Island Aerodrome Controller (ADC) instructed the crew to descend to 4,000 ft above mean sea level (AMSL) due to the pending departure of a Boeing Company 717-200 (717), registered VH-VQB, from runway 14. The crew of the 737 requested and were approved by the ADC to track for a left downwind to runway 14. The ADC instructed the crew of the 717 to maintain 3,000 ft AMSL, to make a right turn to track to Mackay and that they were clear for takeoff. The weather was visual meteorological conditions (VMC) and the crew of the 737 reported to the ADC that they could see the 717. The ADC instructed the crew of the 737 to make a visual approach to left base that was amended to a right base after the crew requested that change. Shortly after intercepting the outbound track at about 2,000 ft, the crew of the 717 received a traffic alert and collision avoidance system (TCAS) traffic advisory (TA) and saw the 737 crossing from left to right on descent. The 717 crew's perception was that the expected track of the aircraft would place them on, or close to a collision course so they turned left and descended to avoid the 737 by passing behind it.

 
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