A flight control surface assembly adapted to be mounted to a main wing of an aircraft includes a flight control surface having a first portion and a second portion spaced from each other, a connection assembly adapted for movably connecting the flight control surface to the main wing, such that the flight control surface is selectively movable in a predetermined movement between a retracted position and an extended position with respect to the main wing, and for each of the flight control surface, a first roller with a first axial face and a second roller with a second axial face facing the first axial face mounted rotatably and coaxially. with a gap between the first and second axial end faces. A biasing mechanism biasing the first and second rollers towards each other, and a transmission mechanism coupled between the flight control surface and the rollers are included.