A very tragic day for all six and sadly..it appears once again that a dynamic "failure" appears paramount in all of this. No end of CASA fixes will prevent a repeat…( The Grumman in Perth)..the generic.."failure" is the tapestry of what we do in aviation and its pure training and attention to the failure dynamic that keeps us aware..ANY hesitation to attend to this will cause a very high risk of incident… RIP and a sad day for all who fly..