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On 19 April 2007, the Darwin radar (DNR) airspace was being operated as a non-radar procedural sector due to the removal of the Australian Defence Air Traffic System (ADATS) radar data from the civil Australian Advanced Air Traffic System (TAAATS). That change in arrangements was necessary because of ongoing technical problems with the integration of the ADF data into the civil radar system.

At about 0909 Central Standard Time, the DNR controller identified that an instrument flight rules (IFR) Cessna Aircraft Company C210N, tracking from Darwin to Gove, NT at an altitude of 9,000 ft, was in conflict with an IFR Piper Aircraft Corporation PA31-350 that was tracking from Bathurst Island to Jabiru and that a breakdown of separation standards had occurred. The controller re-established the required separation.

The investigation identified that the safety management system employed by Airservices Australia did not require the conduct of an independent review of the locally-conducted hazard assessment process that was utilised to manage the controller's loss of radar surveillance capabilities. This was considered to be a safety issue.

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General details
Date: 19 April 2007 Investigation status: Completed 
Time: 0912 CST  
Location   (show map):157km East of Darwin Aero. Investigation type: Occurrence Investigation 
State: Northern Territory Occurrence type: Loss of separation 
Release date: 25 June 2009 Occurrence class: Airspace 
Report status: Final Occurrence category: Serious Incident 
 Highest injury level: None 
Aircraft 1 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-31 
Aircraft registration: VH-AZJ 
Serial number: 31-8152152 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Bathurst Island, NT
Destination:Jabiru, NT
Aircraft 2 details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 210 
Aircraft registration: VH-TFF 
Serial number: 21064277 
Type of operation: Air Transport Low Capacity 
Damage to aircraft: Nil 
Departure point:Darwin, NT
Destination:Gove, NT
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Last update 14 November 2018