bose, IO540
I don't know which of you is right, but I do think that it is vitally important that we all understand this...there won't be time to find out in an emergency.
I'll look it up in the manual (which I have downloaded) if I get the chance later, and post the relevant text, but if anyone gets a definitive answer first (and, I am sorry, but I don't think we can rely on an avionics engineer for a definitive answer) please tell us all!
Will