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Circumstances At 1635 hours VH-TQK departed Port Macquarie for Sydney via a track of 221 deg from Port Macquarie. An airways clearance was issued by RAAF Williamtown Air Traffic Control [ATC] for VH-TQK to enter controlled airspace [CTA] on this track on climb to Flight Level [FL] 160. At 1537 hours VH-AMS departed Port Macquarie for Williamtown on a track of 200 deg from Port Macquarie. An airways clearance was issued by Williamtown ATC for VH-AMS to enter CTA on this track to FL 140. The clearances were issued when neither aircraft was identified on radar and with no vertical or longitudinal separation requirement. In such circumstances the only separation standard available is lateral which required 30 deg between the departure tracks in question. As only 21 deg existed, a breakdown in separation occurred. Radar analysis indicates that the aircraft were 7.6 NM apart when they were established in CTA and that this distance increased before radar identification was complete. It also shows that the vertical difference was a minimum of 500 ft which occurred prior to identification. Significant Factors 1. The Williamtown air traffic controller issued procedural airways clearances that were not in accordance with the appropriate separation standard.
Download Final Report
[ Download PDF: 15KB]
 
 
 
 
General details
Date: 15 March 1993 Investigation status: Completed 
Time: 16:37 EST Investigation type: Occurrence Investigation 
 Occurrence type:Loss of separation 
 Occurrence class: Airspace 
Release date: 12 August 1993 Occurrence category: Incident 
Report status: Final  
 
Aircraft 1 details
Aircraft manufacturer: Beech Aircraft Corp 
Aircraft model: B200C 
Aircraft registration: VH-AMS 
Sector: Turboprop 
Damage to aircraft: Nil 
Departure point:Port Macquarie NSW
Destination:Williamtown NSW
Aircraft 2 details
Aircraft manufacturer: British Aerospace PLC 
Aircraft model: 3107 
Aircraft registration: VH-TQK 
Sector: Turboprop 
Damage to aircraft: Nil 
Departure point:Port Macquarie NSW
Destination:Sydney NSW
 
 
 
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Last update 23 July 2015