You may write as long a post as you wish, its always gratefully received.
I'm getting the idea now. Its one thing understanding the relationship between the components of a particular system, but knowing how they're actually used in anger is another.
Would still dearly like to know a.) the difference between THR & THR REF and b.) If I chose to drop out of VNAV with the AP connected and a different ALT on the ATL SEL, would the MCD default to ALT HOLD or......?
Thanks again for the education.