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VH-WGG departed Williamtown at 0703 hours and proceeded to track via the 015 radial of the Sydney VOR at 8,000 ft. The pilot contacted the Sydney Departures North controller 28 NM from Sydney and the radar identification was passed to the Approach North controller, who raised a 'shrimp boat' (a small piece of plastic which adheres to the radar screen and allows the controller to write pertinent information on it for his/her reference) and placed it on the radar screen next to the radar return of VH-WGG. The shrimp boat was not positionally updated nor was it annotated to indicate to which aircraft it was referring. When an aircraft passes overhead Sydney, its track impinges on all four sectors of approach/departures airspace and two flight progress strips (FPSs) are raised, one for approach use and one for departures. These FPSs are pink in colour to enable them to stand out from the other FPSs in use. The aircraft is identified by the controller in whose airspace it enters and the progress is then monitored by all four controllers by updating the position of their 'shrimp boats' on the radar screen and placing the pink FPS in the central (active) strip bay.
Download Final Report
[ Download PDF: 1.72MB]
General details
Date: 24 November 1992 Investigation status: Completed 
Time: 0727 EST  
Location   (show map):Mona Vale  Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Loss of separation 
Release date: 20 March 1994 Occurrence class: Airspace 
Report status: Final Occurrence category: Airspace 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747 
Aircraft registration: VH-OJG 
Serial number: 24779 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Los Angeles, USA
Destination:Sydney, NSW
Aircraft 2 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-31 
Aircraft registration: VH-WGG 
Serial number: 31-7405175 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Williamtown, NSW
Destination:Canberra, ACT
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Last update 13 May 2014