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VH-NJC, was en route from Cairns to Ayers Rock cruising at flight level (FL)280. VH-TAJ, was en route Darwin to Adelaide, cruising at FL330. The crossing point of the two tracks was approximately 100 nautical miles east of Alice Springs. Near the intersection of the two tracks, the pilot of VH-TAJ requested a clearance from air traffic control to desend to FL270. This was approved. Subsequently the air traffic controller realised VH-TAJ did not have the required lateral separation from VH-NJC. He checked the level of VH-TAJ but the aircraft had left FL285 on descent. The aircraft was allowed to continue the descent as both aircraft were well clear of each other, but within the area of lateral confliction.
General details
Date: 14 September 1993 Investigation status: Completed 
Time: 8:10 CST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Loss of separation 
Release date: 29 March 1994 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft 1 details
Aircraft manufacturer: British Aerospace PLC 
Aircraft model: BAe 146-100A 
Aircraft registration: VH-NJC 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Cairns QLD
Destination:Ayers Rock NT
Aircraft 2 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 737-376 
Aircraft registration: VH-TAJ 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Darwin NT
Destination:Adelaide SA
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Last update 24 July 2015