Originally Posted by
KayPam
But now there is a rule, for which the only reason given in this topic was "to avoid destabilizing the flight path" which prevents me from touching the FCU (but I still can manipulate my QNH button and set it myself even in manual flying..), so I have to ask. And in some situations, when the PM is not immediately available to hear the instruction, it clearly takes more resource than turning the knob myself, which I did very well on my own in single pilot operations.
This is your first 2 crew aircraft I take it?
FCU PM manipulation is not solely for destabilising reasons.
Grab your FCTM and find out. It's near the front in the Airbus Operating Philosophy chapter> TASKSHARING RULES AND COMMUNICATION. Look it up.