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On 4 March 2010, a Boeing Company 717-200 (717) departed Perth, Western Australia (WA) on a scheduled passenger service to Port Hedland, WA.
The aircraft was tracking on a GURAK 3 standard instrument departure, which involved transiting through Pearce military controlled airspace. While maintaining flight level (FL) 1201 and turning left onto a heading of 330 degrees under the control of Pearce air traffic control (ATC), the crew
received a traffic advisory (TA) warning from the traffic alert and collision avoidance system (TCAS). The crew advised ATC and were instructed to continue the turn onto a heading of 360 degrees. During the turn, the crew received a resolution advisory (RA). The crew responded and climbed the aircraft to FL125.

The crew were advised by ATC that the conflicting aircraft, a military-operated Raytheon Aircraft Company 350 (King Air) descending through FL120 on a reciprocal track, had the 717 in sight and was maintaining separation. By this time, the radar separation standard had reduced below the required distance of 3 NM (5.6 km).

This occurrence reinforces the importance of effective coordination between ATC positions, and highlights the challenges faced by air traffic controllers when managing aircraft operating within the same airspace, but under the control of different ATC positions.

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General details
Date: 04 March 2010 Investigation status: Completed 
Time: 1039 WST  
Location   (show map):22 km NW of Perth aerodrome Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Loss of separation 
Release date: 14 October 2010 Occurrence class: Airspace 
Report status: Final Occurrence category: Serious Incident 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 717 
Aircraft registration: VH-NXK  
Serial number: 55092 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Perth, WA
Destination:Port Hedland, WA
Aircraft 2 details
Aircraft manufacturer: Raytheon Aircraft Company 
Aircraft model: 350 
Aircraft registration: Unknown 
Type of operation: Military 
Damage to aircraft: Nil 
Departure point:Pearce, WA
Destination:Pearce, WA
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Last update 18 April 2018