I notice is that most Autopilots are meant to be switched off when taxying on the ground. Any idea why some are not?
Weight on wheels logic cuts it out totally or puts it in SAS mode.
Would it be better to fly with the Force Trim off?
Sounds like a good way to induce an out of phase PIO! The mass of your arm will be subject to the turbulence forces and will become part of the control loop.