When you read the way that some other RFDS crew also incorrectly responded to the same failure on previous occasions, you would have to think that the RFDS training systems was the biggest contribution to this incident.
Surely with so many PC-12's they should be investing in simulator training and checking. Touch drill training/checking for failures is a cheap but poor substitute. And if experience levels are dropping, sim training/checking is even more valuable.
I imagine that if this event had ended with fatalities, they would be getting a simulator quick smart!
Well done to the pilot for getting it down.