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VH-NID [DHC8] had departed Sydney for Port Macquarie and was maintaining Flight Level [FL]170 and passed Williamtown at 2139 estimating Port Macquarie at 2202 hours[All times are UTC]. VH-RUI [PA31] taxied at Port Macquarie for Williamtown at 2149 hours and was passed traffic on VH-NID by Sydney Flight Service [FS]. At 2150 hours VH-NID called on area frequency and reported leaving FL150 on descent with a circuit estimate for Port Macquarie of 2159 hours. FS passed traffic on VH-RUI to VH-NID informing the crew that VH-RUI was taxiing and would climb to 6000ft. At 2151 hours VH-RUI gave his departure call on area frequency as time 50 and climbing to 6000ft. No further calls were made by either crew until 2157.30 hours when VH-NID advised on area frequency that he was changing to MTAF and asked Sydney to confirm the altitude of VH-RUI as 2000ft. VH-RUI advised that he was maintaining 6000ft. Interviews confirm that the incident occurred approximately one minute prior to this transmission. Both crews agree that the occurrence was approximately 15-20nm south of Port Macquarie and the Automatic Voice Recorder [AVR] analysis, when combined with pilot reports, put the time of passing at between 2156.30 and 2157.00 hours. The pilot of VH-RUI stated that he first saw VH-NID descending in front of him and about 300ft above, causing him to take violent evasive action. The crew of VH-NID stated that they saw VH-RUI about 1000m to their left when approaching 7000ft and therefore had no need to limit their descent. Both crews were given traffic information on each other in a correct and timely manner and stated that they were on track. The weather was fine with no cloud.
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General details
Date: 07 September 1992 Investigation status: Completed 
Time: 7:58 EST  
 Investigation type: Occurrence Investigation 
 Occurrence type: Loss of separation 
Release date: 04 May 1993 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft 1 details
Aircraft manufacturer: de Havilland Canada 
Aircraft model: DHC-8-103 
Aircraft registration: VH-NID 
Sector: Turboprop 
Damage to aircraft: Nil 
Departure point:Sydney
Destination:Port Macquarie
Aircraft 2 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-31-350 
Aircraft registration: VH-RUI 
Sector: Piston 
Damage to aircraft: Nil 
Departure point:Port Macquarie NSW
Destination:Williamtown NSW
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Last update 23 July 2015