What is the function of the servos in an autopilot system?

In an autopilot system, the servos play a crucial role in controlling the aircraft's flight control surfaces. Their primary function is to actuate the flight controls, meaning they physically move the control surfaces (such as ailerons, elevators, and rudders) in response to commands from the autopilot system. This actuation allows the aircraft to follow the predetermined flight paths and maintain designated attitudes, speeds, and altitudes as set by the pilot or the flight management system.

The servos essentially function as the muscles of the autopilot system, translating electronic signals into mechanical movements that manage the aircraft's flight dynamics. Without the servos, the autopilot would not be able to make the necessary adjustments to the flight controls, rendering it ineffective in stabilizing and guiding the aircraft. This is why the correct answer emphasizes the actuation role of servos within the autopilot system.