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FACTUAL INFORMATION A Piper PA23 aircraft,VH-MBU, on a right base leg for runway 15 conflicted with a Boeing 737 on left base leg as a result of a co-ordination breakdown. VH-MBU was inbound from Stoney Creek and the Approach 2 controller co-ordinated with the Tower Controller to process the aircraft via right base leg behind a Boeing 747 on final approach for runway 15. The pilot was asked to sight the B747, which he did. The pilot was then told to contact the Tower. There was no co-ordination with Approach 1. The Approach 1 controller had transferred a Boeing 737 VH-TAK, to the Tower and asked Approach 2 what he was doing with MBU and should TAK be following MBU, to which he replied in the affirmative. TAK was turning left base on Tower frequency by this time. Co-ordination with the Tower Controller alerted him to the confliction. The Tower Controller advised MBU to orbit right base and TAK was allowed to continue with the visual approach. Radar data confirmed that the two aircraft conflicted with a separation of 1.5 NM at the closest point of approach. ANALYSIS The Approach 2 controller failed to co-ordinate the landing sequence with the Approach 1 controller. The reason for this lapse in performance was not positively established but the controller's supervisor thought that a desire to provide an expeditious service may have been a contributing factor.
Download Final Report
[ Download PDF: 15KB]
General details
Date: 27 August 1996 Investigation status: Completed 
Time: 10:45 EST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Loss of separation 
Release date: 27 September 1996 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft 1 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-23-250 
Aircraft registration: VH-MBU 
Sector: Piston 
Damage to aircraft: Nil 
Departure point:Mareeba QLD
Destination:Cairns QLD
Aircraft 2 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 737-376 
Aircraft registration: VH-TAK 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Brisbane QLD
Destination:Cairns QLD
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Last update 28 October 2014