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VH-TFB was inbound to Sydney from Canberra and had been instructed to descend to 5,000ft for an approach to runway 16R. At the same time, VH-WMY was inbound to Bankstown from the north, maintaining 3,000ft. VH-TFB was subsequently observed by radar to descend to 3,200ft, about 1 NM from VH-WMY. The pilot of VH-TFB was given traffic on the other aircraft and instructed to immediately turn left and climb to 5,000ft. This instruction was complied with promptly. The pilot of VH-WMY was visual between cloud layers and became aware of VH-TFB as it turned and climbed. The pilot of VH-TFB later reported having been distracted whilst flying through a line of thunderstorms, associated with heavy rain and turbulence, and had inadvertently descended below his assigned altitude.
Download Final Report
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General details
Date: 28 November 1994 Investigation status: Completed 
Time: 22:03 ESuT  
 Investigation type: Occurrence Investigation 
 Occurrence type: Operational non-compliance 
Release date: 15 February 1996 Occurrence class: Airspace 
Report status: Final Occurrence category: Incident 
Aircraft 1 details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 441 
Aircraft registration: VH-TFB 
Sector: Turboprop 
Damage to aircraft: Nil 
Departure point:Canberra ACT
Destination:Sydney NSW
Aircraft 2 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: 600A 
Aircraft registration: VH-WMY 
Sector: Piston 
Damage to aircraft: Nil 
Departure point:Tamworth NSW
Destination:Bankstown NSW
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Last update 21 October 2014