Originally Posted by PJ2
For these FCU controls to have any effect on the aircraft, the autopilot must be engaged.
Just to acknowledge, DJ77 describes the function in his post above, and mentioned correctly that the VS resets instantaneously if the FDs become available.
PJ2 and DJ77, my thanks to you both. I understand that the recorded changes of selected V/S do not indicate a pilot action, and have no effect on the aircraft with AP OFF. Would they affect the FD and thereby influence the PF's actions?
Regarding the indicated V/S, I note that the source switched several times between IR and ADR. Would that be automatic too?