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Perth ATS assigned the aircraft an altitude of FL330 on descent from FL370. However, the radar mode C display of the aircraft showed the aircraft descending through FL330 to a final level of FL323. When the air traffic controller queried the crew, the pilot verified FL330. The mode C readout then showed the aircraft climbing and then maintaining FL330. When the aircraft descended below FL330, a Fokker F28 was at FL310, and positioned 4 NM away.

 
General details
Date: 20 November 1998 Investigation status: Completed 
Time: 1358 hours WST Investigation type: Occurrence Investigation 
Location   (show map):228 km N Perth, Aero. Occurrence type:Loss of separation 
State: Western Australia Occurrence class: Airspace 
Release date: 20 August 1999 Occurrence category: Incident 
Report status: Final Highest injury level: None 
 
Aircraft 1 details
Aircraft manufacturer: Fokker B.V. 
Aircraft model: F28 
Aircraft registration: VH-EWD 
Serial number: 11208 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Karratha, WA
Destination:Perth, WA
Aircraft 2 details
Aircraft manufacturer: Airbus Industrie 
Aircraft model: A340 
Aircraft registration: 9V-SJB 
Serial number: 32-40062 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Nil 
Departure point:Singapore
Destination:Perth, WA
Crew details
RoleClass of licenceHours on typeHours total
Pilot-in-CommandATPL1400.019147
 
 
 
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Last update 13 May 2014