What are the primary flight control surfaces on the A320 family and how are they actuated in Normal Law?

• A. Mechanical controls with rigid linkages and separate hydraulic actuators.
• B. Elevators, Ailerons, and Rudder; Fly-by-wire with hydraulically actuated actuators controlled by flight control computers under Normal Law.
• C. Elevators and Rudder only; Ailerons are not primary controls.
• D. Electrically driven surfaces without hydraulic support and no flight control computers.

Answer: (B)

The primary flight control surfaces on the A320 family are the elevators (pitch), the ailerons (roll), and the rudder (yaw). In Normal Law, control is fly-by-wire: pilot inputs go to the flight control computers, which process the commands and provide surface deflections with protections and coordinated responses. The commanded movements are sent to hydraulically powered servos that physically move the surfaces. Redundant hydraulic systems supply the actuators, ensuring surface movement even if one system falters. So, these surfaces are actuated hydraulically under computer control, not by direct mechanical linkages or purely electrical means.