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On 26 August 2011, a Hawker Beechcraft Corporation B200 aircraft, registered VH-MWH (MWH), departed Ivanhoe for Broken Hill, New South Wales. While maintaining flight level 140, the pilot of MWH received a traffic alert and collision avoidance system (TCAS) traffic advisory (TA) on a Regional Express S.A.A.B. Aircraft Corporation 340B aircraft, registered VH-ZRC (ZRC), which had departed Broken Hill for Sydney and was on climb to flight level 170.

At about the same time, while climbing through flight level 130, the crew of ZRC received a TCAS TA, shortly followed by a resolution advisory (RA). As the First Officer (FO) believed they were above MWH, he immediately commenced a climb. Shortly after, the Captain noted that the FO's response was contrary to the RA command to descend and advised the FO, who immediately commenced a descent.

A review of the Airservices Australia radar data indicated that, with both aircraft at flight level 142, lateral separation reduced to 2.2 NM.

This incident highlighted the benefit of TCAS in assisting pilots with traffic awareness and the importance of responding appropriately to a TCAS RA.

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General details
Date: 26 August 2011 Investigation status: Completed 
Time: 0721 EST  
Location   (show map):87 km east of Broken Hill Airport Investigation type: Occurrence Investigation 
State: New South Wales Occurrence type: Separation issue 
Release date: 24 May 2012 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: S.A.A.B. Aircraft Co 
Aircraft model: 340 
Aircraft registration: VH-ZRC 
Serial number: 340B-390 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Broken Hill, NSW
Destination:Sydney, NSW
Aircraft 2 details
Aircraft manufacturer: Hawker Beechcraft Corporation 
Aircraft model: 200 
Aircraft registration: VH-MWH 
Serial number: BB-2003 
Type of operation: Aerial Work 
Damage to aircraft: Nil 
Departure point:Ivanhoe, NSW
Destination:Broken Hill, NSW
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Last update 01 March 2016