A380 Ailerons
I've been fortunate enough to have had several flights in the A380 as a passenger, but this last one a few days ago was the first where I've been overlooking the wing. I was struck, during the approach and landing, by the fact that the aileron is split into 3-4 sections and - more to the point - they appear to act in opposition. Why would the system command simultaneous large up and down movements, as opposed to a single small movement?
Hope that makes sense!