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Safety Action



Following this and other similar occurrences, Airservices Australia has changed the TAAATS system to reduce the possibility of similar false radar couplings. This change consisted of adding an additional longitudinal check that limits the size of the Coupling Corridor to within a defined Variable System Parameter (minutes) ahead and behind the estimated position of the aircraft based on FDP time estimates. Initially this parameter was set to 12 minutes. This additional longitudinal check was only to be applied for Flight plans that were "Active" or "Inhibited".

The software carrying this fix was installed in the ML FIR on the night of January 17th 2001 and in the BN FIR on the night of May 10th 2001.

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