Bizjetjock,
thanks, good info. In the next post from ifleeplanes: as a side note, in the MD-80, you can trim the ailerons with the ap engaged. The control yoke can be centered. You have just traded aileron position (thru control tab) for trim tab position. So obviously this is different from the 737 which I would expect it to be since the 80 is flown with control tabs.
Regards