Investigation number
199805323
Occurrence date
Location
228 km N Perth, Aero.
Report release date
Report status
Final
Investigation type
Occurrence Investigation
Investigation status
Completed
Aviation occurrence type
Loss of separation
Occurrence category
Incident
Highest injury level
None
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.
Aircraft Details
Manufacturer
Fokker B.V.
Model
F28
Registration
VH-EWD
Serial number
11208
Operation type
Air Transport High Capacity
Departure point
Karratha, WA
Destination
Perth, WA
Damage
Nil
Aircraft Details
Model
A340
Registration
9V-SJB
Serial number
32-40062
Operation type
Air Transport High Capacity
Departure point
Singapore
Destination
Perth, WA
Damage
Nil