On large airliners, the wings are generally of the high aspect ratio types and hence very flexible. Now the flaps are attached to wing only through a series of tracks, and as the wings flex, these tracks change relative positions to one another as well. How is the flap designed so that it can ride on these tracks regardless of their positions? I scoured the internet for answers and the only vague one I got is this description
One of the flap tracks positions the flap and all others absorb horizontal displacement.
Intuitively this is like designing a door that can open and close with a doorframe that is sometimes straight and sometimes crooked. Is the door also flexible itself?
This question applies to not just flaps, but to spoilers, speed brakes and leading edge slots or drooping leading edges as well. How are they designed?