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The BAe146 and the SAAB 340B were on converging tracks. The air traffic controller responsible for their separation received an electronically generated Short Term Conflict Alert (STCA) on his display. The STCA was a warning to the controller that the predicted radar paths of the two aircraft may lead to a loss of separation standards. The required separation standard was 5 NM laterally or 1,000 ft vertically. By the time the controller took positive control and instructed the crew of the BAe146 to turn left for avoiding action, lateral separation had reduced to below the required standard. The crew of the SAAB received a Traffic Alert from their aircraft's traffic alert and collision avoidance system (TCAS).

Analysis of the radar data indicated that lateral separation between the two aircraft reduced to 2.4 NM and vertical separation to 500 ft. The controller did not use any separation assurance technique in his traffic management plan. He stated that he was used to working in a much busier air traffic environment: circumstances that would demand closer vigilance. At the time of the conflict, the controller was distracted from his primary task of providing a radar control service during a discussion with a TAAATS Flight Data Corrections (TFDC) officer over a minor administrative issue.

General details
Date: 11 November 2000 Investigation status: Completed 
Time: 1936 hours ESuT  
Location   (show map):West Maitland, (VOR) Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Loss of separation 
Release date: 25 July 2001 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: British Aerospace PLC 
Aircraft model: BAe 146 
Aircraft registration: VH-EWR 
Serial number: E3195 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Sydney NSW
Destination:Brisbane, QLD
Aircraft 2 details
Aircraft manufacturer: S.A.A.B. Aircraft Co 
Aircraft model: 340 
Aircraft registration: VH-OLN 
Serial number: 207 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Coffs Harbour, NSW
Destination:Sydney, NSW
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Last update 13 May 2014