Some autopilot systems have a small rudder input with ailerons. For example, my jet, the VC10 does. The Tristar doesn't. When we are taking fuel from a Tristar, on rolling into a turn we appear to move out to the outside of the turn. The effort of getting back onto the centreline isn't worth it, as when established in the turn, we appear to move out to the other side. We don't have this problem when taking fuel from the VC10.
I don't know about more modern systems. I should think that Airbus have programmed something into the electronic trickery of their Fly By Wire systems. Anyone else know?
[This message has been edited by Dan Winterland (edited 02 October 2000).]