What is the primary function of the yoke or stick in an aircraft?

The primary function of the yoke or stick in an aircraft is to control the primary flight surfaces, which include the ailerons, elevators, and in some cases, the rudder. The yoke or stick serves as the pilot's primary interface for maneuvering the aircraft in three-dimensional space. By manipulating the yoke or stick, the pilot can roll the aircraft left or right, pitch it up or down, and, in conjunction with the rudder pedals, control yaw movements. This is essential for maintaining control during different phases of flight, such as takeoff, cruising, and landing.

Other choices do not accurately describe the function of the yoke or stick. Managing the aircraft's speed is primarily done through throttle controls, while navigation lights are controlled via a separate switch and have no relationship to the flight control surfaces. Communication with air traffic control is handled through radios and does not involve the yoke or stick at all. The yoke or stick is vital for direct flight control, emphasizing its importance in piloting and aircraft operation.