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VH-EAA was processed into the Sydney Terminal Area by the Approach south radar control sector, and was tracking via the 094 VOR radial, on descent to 6,000 ft in visual conditions. At 9 DME, the flight crew, in response to a TCAS RA alert, climbed the aircraft approximately 300 ft. They did not advise ATC of the alert. VH-NEK had departed runway 16L, on initial climb to 5,000 ft, and was being processed to depart the Sydney Terminal Area by the Departures south radar control sector. The aircraft was vectored onto a north-easterly track from a left turn after takeoff. Recorded radar information indicated that VH-EAA had continued descent to a pressure altitude of 5,700 ft and VH-NEK had climbed to a pressure altitude of 4,900 ft. When their flight paths crossed, VH-EAA was 800 ft above, and 1.86 NM to the right of VH-NEK. The traffic management plan, techniques and procedures, for processing both aircraft were adequate to maintain prescribed separation standards and tolerances in accordance with the runway 16 airspace agreement. However, neither controller had recognised the incident, probably due to the short duration of the encounter, and the lack of advice from either flight crew. Findings 1. The traffic management procedures adopted by the controllers for processing the aircraft were adequate. 2. VH-EAA descended below the assigned altitude. 3. In response to the TCAS RA alert, the flight crew returned the aircraft to the assigned altitude. Significant factors 1. The required separation standard was infringed when the flight crew permitted VH-EAA to descend below their assigned altitude.
Download Final Report
[ Download PDF: 15KB]
 
 
 
 
General details
Date: 09 October 1995 Investigation status: Completed 
Time: 8:10 EST Investigation type: Occurrence Investigation 
 Occurrence type:Loss of separation 
 Occurrence class: Airspace 
Release date: 20 December 1995 Occurrence category: Incident 
Report status: Final  
 
Aircraft 1 details
Aircraft manufacturer: Fairchild Industries Inc 
Aircraft model: SA227-AC 
Aircraft registration: VH-NEK 
Sector: Turboprop 
Damage to aircraft: Nil 
Departure point:Sydney NSW
Destination:Tamworth NSW
Aircraft 2 details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747SP-38 
Aircraft registration: VH-EAA 
Sector: Jet 
Damage to aircraft: Nil 
Departure point:Auckland New Zealand
Destination:Sydney NSW
 
 
 
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Last update 21 October 2014