When the control wheel is pulled back, what role does a servo tab play?

When the control wheel is pulled back, the servo tab's primary function is to create aerodynamic force that assists the movement of the elevator. The elevator is responsible for controlling the pitch of the aircraft, and when the pilot pulls back on the control wheel, the elevator moves up to increase the angle of attack and pitch the nose of the aircraft up.

The servo tab is designed to enhance this movement by deflecting in a direction that generates additional aerodynamic force in favor of the elevator’s deflection. This aerodynamic force effectively helps to move the elevator without requiring as much physical force from the pilot, making control smoother and more responsive.

Other options presented focus on different aspects of control surfaces but do not accurately describe the specific role of the servo tab in relation to the elevator's operation during pitch changes. For example, while reducing control sensitivity or acting as a counter-balance may apply to other control mechanisms, the relevant function in this scenario is clearly the aerodynamic assistance to the elevator's movement.