The FACs provide ___________ to the rudders.

The Flight Augmentation Computers (FACs) are critical components in the A320's flight control system responsible for enhancing the aircraft's handling characteristics. One of their primary functions is to provide turn coordination and yaw damping. Turn coordination helps ensure that when the aircraft is turning, it maintains a balanced flight path, preventing excessive sideslip, which enhances passenger comfort and control. Yaw damping, on the other hand, helps to stabilize the aircraft against unwanted yaw movements, such as those induced by turbulence or asymmetric thrust. This functionality is vital for maintaining control during various flight phases, particularly during turns and in crosswind conditions, thereby improving overall safety and performance.

Other choices address functionalities that are not associated with the FACs. While elevator control and lift augmentation are related to the aircraft's pitch control systems, throttle adjustments pertain to the engines and are managed by different systems. Roll stability and altitude maintenance involve other flight control mechanisms that do not specifically involve the FACs' role in coordinating yaw and ensuring stability.