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On 4 April 2007 at about 0809 Eastern Standard Time a Boeing Aircraft Company 737-8FE registered VH-VON was inbound to Sydney, NSW from Melbourne, Vic. on descent to 6,000 ft and an Airbus A330-342X, registered B-HLW was departing Sydney for Hong Kong on climb to 7,000 ft. The distance between the aircraft reduced to 1.9 NM horizontal and 600 ft vertical separation. Separation standards as specified in the Manual of Air Traffic Services (MATS) required the provision of either 3 NM horizontal or 1,000 ft vertical separation between the aircraft. There was a breakdown of separation.

The loss of separation occurred as a result of the separation that was planned by the air traffic control officer being based on an incorrect cleared flight level (CFL) that had been entered into the controller's air situation display (ASD). The investigation concluded that this data entry error occurred within 2 minutes of the air traffic controller assuming responsibility for the control position, and that the reconfiguration of the in-use console by the controller during that time increased the risk of the controller being distracted from the traffic separation task.

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General details
Date: 04 April 2007 Investigation status: Completed 
Time: 0805 EST  
Location   (show map):12 NM southwest Sydney Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Loss of separation 
Release date: 18 December 2007 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 737 
Aircraft registration: VH-VON 
Serial number: 33795 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Melbourne, Vic
Destination:Sydney, NSW
Aircraft 2 details
Aircraft manufacturer: Airbus Industrie 
Aircraft model: A330 
Aircraft registration: B-HLW 
Serial number: 565 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Sydney, NSW
Destination:Hong Kong
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Last update 18 April 2018