Originally Posted by
clvf88
Its got nothing to do with pilot input.
Essentially, hydraulic pressure is removed from them during takeoff which causes them to droop - then lift aerodynamically with increased airspeed. Then at x kts hydraulic pressure is restored and they return to the commanded position. I don't think its covered in the FCOM etc but I believe its to do with preventing unnecessary stress on the flaperon actuators.
Thanks! I have watched a couple of wing-view videos and the seem to confirm it. The 787 wing lives a life of its own
Does the AMM cover this logic?
Cruise flaps; black box technology as far as pilot manuals are concerned. It just works!
Yup, Boeing FCOM provides very scant info on them and they are completely transparent to the pilot (other than a STATUS message when they break down). Still, would love to know more on how they work...