Originally Posted by
Ian Arrighi
Sio am I right in concluding this guy went through BNE primary control zone unplanned and without communication without issue (as he intended to end his journey just to the north of BNE) and somehow that didn't raise any red flags but after he had flown another 120km and exceeded his SAR time ATC started to get concerned?
No, you are not right to conclude that.
The aircraft was originally under the control of ATC and on radar before losing comms well north of Brisbane. That is when the red flags were raised (and presumably a SAR phase initiated).