Half of the servo valve on each cylinder directs PC No. 1 hydraulic pressure to the corresponding half of the PC cylinder. The second half of the servo valve directs PC No. 2 hydraulic pressure to the other half of the cylinder. Input control linkage connected to the servo valve control arm of the PC cylinders positions the valve slider to direct pressure to the actuating pistons. The actuating piston extends or retracts the cylinder housing. As the cylinder housing moves, the servo valve control arm repositions the servo valve slider.
Fluid flow is blocked to and from the cylinder until a new control system input is initiated.
The spoiler extends upward into the airstream, disrupting the airflow and causing decreased lift on that wing. The deflector extends down into the airstream and scoops airflow over the wing surface aft of the spoiler, preventing airflow separation in that area. The deflector is mechanically slaved to the spoiler. It can be deflected to a maximum of 30 degrees when the spoiler is at 60 degrees. The spoiler deflectors open only with the upward movement of the ailerons.