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VH-ANA [B727] was enroute from Brisbane to Sydney at Flight Level [FL] 330. At 0949 hours EST the crew were authorised by Sydney air traffic control [ATC] to descend, when ready, to FL 280. One minute later this clearance was cancelled by ATC and VH-ANA was required to maintain FL 330. The aircraft had not commenced descent. All Nippon Airways 914 [B747] had departed Sydney for Narita [Japan] and was climbing to an initial altitude of FL 280. The track of this aircraft would cross that of VH-ANA approximately 120 NM north of Sydney. All Nippon Airways 914 was given climb to FL 310 at 0946 hours and, due to a busy period of air traffic, this change of level was not co-ordinated until 0949 hours. On receiving the notification of the level change, the controller responsible for VH-ANA took immediate action to reintroduce procedural separation before radar separation was lost. The aircraft passed at 0951 hours with 2,000ft vertical difference. There was no breakdown in separation standards.
Download Final Report
[ Download PDF: 11KB]
General details
Date: 06 April 1993 Investigation status: Completed 
Time: 9:50 EST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Breakdown of co-ordination 
Release date: 12 August 1993 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 727-277 
Aircraft registration: VH-ANA 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Brisbane QLD
Destination:Sydney QLD
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Last update 23 July 2015