Originally Posted by
Check Airman
Thanks. I find that a little strange, particularly in light of the Airbus incident a few years ago where the sidestick wires were crossed, and so the roll control was reversed.
I imagine Boeing has found a way around that, as it’s worked for the last almost 30 years though. Appreciate it.
I think the only reasonably foolproof way to check if the surfaces are working would be have somebody look at them while you were exercising the controls. You are relying on sensors otherwise. The “carry away” I got from the discussion I had was that it was important to exercise the controls through their full range of motion (to the stops) to pick up anything untoward; the comparison logic is active as soon as things are powered up, so “control checks” are ongoing throughout the whole flight.