Hi all,
After a few thousand cycles no airplane is exactly like it was in the beginning. We have some 321 which fly with 1,5 degree of bank in cruise flight.
In cruise flight the autopilot uses ruddertrim to zero out the forces, causing the above mentioned bank angle, and thus keeping the ailerons aligned with the wing. When taking over manually you'll notice (if you zero out the rudder trim, or if you decrease speed in the approach) that the roll rate command of the side stick will cause a slight aileron deflection to keep the roll rate zero. You can notice this behaviour on the FCTL-page on the ECAM.
P77