What is the primary function of control surface rigging?

The primary function of control surface rigging is to ensure proper aircraft handling and response. Control surfaces, such as ailerons, elevators, and rudders, are critical components that influence the aircraft's ability to maneuver and maintain stability during flight. Rigging these surfaces accurately ensures that they move as intended relative to the pilot's inputs, affecting the aircraft's control and responsiveness.

When control surfaces are rigged correctly, they provide the necessary aerodynamic characteristics for the aircraft to perform optimally. This involves setting the proper travel limits and ensuring that the surfaces align correctly with the airflow, which is essential for achieving efficient lift and control.

The other options focus on different systems or functions within the aircraft. Adjusting the fuel flow relates to the engine performance, balancing weight distribution deals with the aircraft's overall stability rather than its control surfaces specifically, and securing the landing gear pertains to ground handling rather than flight dynamics. Thus, option B stands out as the critical choice relating directly to the performance and handling of the aircraft during operation.