A new ATSB investigation bulletin released today highlights five instances of aircraft coming too close to each other.
Two of these occurrences were 'breakdowns of separation,' taking place in airspace under Air Traffic Control, which has carefully defined standards to keep planes a set distance apart.
Several safety actions have come out of these occurrences, including the establishment of an awareness program for Air Traffic Controllers, and a systemic review by Airservices Australia.
Mr Joe Hattley, the ATSB's Assistant General Manager of Aviation Safety Investigations says the…