Airprox serious incident 54 NM south-east of Melbourne Airport on 6 June 2004
An ATSB report has found that a recent airspace incident was both an 'airprox' and a 'serious incident' and that after taking evasive action, a Cirrus SR20 and a Cessna 172 aircraft passed about 200 metres horizontally and 50 ft vertically from each other.