Originally Posted by No Fly Zone
Umm, sure... That otherwise excellent, type rated pilots apparently do not have a deep enough understanding of their machine's backup systems. You said, "complaint," sir, I did not. I'd call it a common concern. Sooner or later, that small, missing bit of functional detail will bite you.
I think you're somewhat mistaken in presuming that these sorts of questions are coming from "excellent pilots" typed in anything other than their keyboards. I, for one, rather doubt that had the OP actually been a crewmember on the aircraft in question, his next stop after talking to that apocryphal captain of his would have been PPRUNE.
But that's just me.