AIR Safety investigators have revealed that the traffic collision avoidance system in one of two Qantas Airbus A330s which came too close to each other near Adelaide last month was not working.
An Australian Transport safety Bureau report confirmed, as revealed in The Australian, that the aircraft were not in danger of colliding when the traffic collision avoidance system of one aircraft issued an alert, called a resolution advisory, which gives pilots instructions they are required to follow.
Aircraft VH-EBO was travelling from Sydney to Perth at 38,000ft on September 20 and the VH-EBS was travelling from Perth to Sydney at 39,000ft when the crew of EBO was cleared by an air traffic controller to climb to 40,000ft.
"Soon after, the controller cancelled the clearance and the aircraft descended back to FL 380 (38,000ft)," the report said.
"The flight crew of EBS received a resolution advisory alert from their aircraft's traffic collision avoidance system. However, EBO's flight crew advised that they did not receive any indications on their traffic collision avoidance system of the presence of EBS.
"A full system test conducted on EBO's traffic collision avoidance system after the incident confirmed it was not functioning."
Investigators said recorded data from the two aircraft showed that the minimum vertical separation was 650ft when the two aircraft were 4.1 nautical miles (8 km) apart laterally.
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