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The crew of the Airbus Industrie A340 responded to a traffic alert and collision avoidance system (TCAS) resolution advisory (RA) and climbed 600 ft above the cleared level of flight level (FL)190. The conflicting traffic was a formation of military McDonnell Douglas Corporation FA-18A Hornet aircraft in transit through a military airspace corridor. Traffic information was passed to the crew of the A340 by the air traffic controller. The Hornet crews were on military control frequencies. At the time of the TCAS alert, the Hornets had climbed to FL180 from FL170 to transit civil airspace via a military airspace corridor 75km north of Sydney, known as the Hunter Corridor. Civil radar data indicated that the Hornets climbed to FL183 and military radar data indicated a climb to FL182. The crews stated that they were positive that they had levelled at FL180, and that they had the A340 in sight. Analysis of the radar data indicated that, at the time of the resolution advisory, the standard vertical separation had reduced to less than 1000ft resulting in an infringement of separation standards.
Download Final Report
[ Download PDF: 13KB]
General details
Date: 05 March 2001 Investigation status: Completed 
Time: 11:16 ESuT  
 Investigation type: Occurrence Investigation 
 Occurrence type: Loss of separation 
Release date: 25 September 2001 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft 1 details
Aircraft manufacturer: Airbus 
Aircraft model: A340 
Aircraft registration: B-HXI 
Sector: Other 
Damage to aircraft: Nil 
Departure point:Hong Kong
Destination:Sydney NSW
Aircraft 2 details
Aircraft manufacturer: McDonnell Douglas Corp. 
Aircraft model: F/A-18A 
Aircraft registration: UNKNOWN 
Sector: Other 
Damage to aircraft: Nil 
Departure point:Williamtown NSW
Destination:Williamtown NSW
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Last update 28 October 2014