The ATSB final report has been released on the Mooney crash with two fatalities west of Coffs Harbour on 20 September 2019. Here is a link:
https://www.atsb.gov.au/media/577925...-052-final.pdf
I believe the ATSB is deficient in this report because they don’t mention that the only way to operate Class C airspace satisfactorily in the terminal environment is to use an approach radar facility. The Minister’s directive of 2004 made this quite clear.
It is all very well to blame the air traffic controller and pilot, but to ignore a Minister’s directive with no explanation, and then not even cover it in the ATSB report, shows that something is going on here.