provide specific details of how "failed radio procedures" led to both the B200 and B727/DC8 events
Thread drift however I want to comment on VH-AAV as I knew the pilot.
With the B200 event the 727 had touched down by the time Kerry (the pilot of VH-AAV Kingair) had declared his landing would not be normal. Like PGW if he had declared a PAN at the outset, the result may have been different. In both cases the pilots expected to fly OK on one engine (which did not happen) and that it was not a PAN situation. I do not blame this accident (or PGW) on failed radio procedures.