The Commonwealth Ombudsman sounds a good start.
Which AAT - Qld?
What does the Ombudsman need to investigate?
What does the diagramme in AndyRR's #79 tell us?
Is 62 deg excessive?
Was that an appropriate angle for carrying tourists?
Was there another way to avoid the birds?
Does the video indicate that was the steepest angle?
I've seen a few people fail to excite Ombudsmen, who have a big workload, so can't spend the time conducting an FBI type forensic investigation.
On the other hand there are a lot of good brains on here, strategic, technical and legal, and if John agrees, could probably present a brief to the Ombudsman which would allow him to make a quick decision that a Department got out of line.