Segment-shaped lever 1, controlled from the steering wheel in the pilot's cabin, turns freely on fixed axis A, as does aileron lever 2, connected at axis B to a tie-rod from the aileron. Mounted in aileron lever 2 is eccentric bearing 3 with two pins, c and d, located eccentrically with respect to centre O. Pin c is connected by link 4 to pin e in segment-shaped lever 1. Pin d is linked to piston rod 5 of hydraulic servocylinder 6. Through tie-rod 8, axis F of segment-shaped lever 1 is linked to lever 7, which is linked, through tie-rod 9, to point K of aileron lever 2. Fork m of lever 7 engages a pin on the stem of the spool in directional valve 10, which controls fluid delivery to servocylinder 6. When segment-shaped lever 1 is turned, its motion is transmitted through link 4 and pin c to turn bearing 3. The segment-shaped and aileron levers (and, correspondingly, points F and K) are displaced with respect to each other, and lever 7 shifts the spool of valve 10. This directs fluid to servocylinder 6, moving the piston and piston rod 5, so that bearing 3 begins to turn in the opposite direction. Turning of the aileron lever operates the ailerons, the force required to turn the control lever being considerably less than if the segment-shaped and aileron levers were rigidly attached to each other.
$4305$CHP,FD$