Which statement best describes the means by which the primary flight controls move the control surfaces?

Which statement best describes the means by which the primary flight controls move the control surfaces?

• A. Mechanical linkages such as cables, rods, and pulleys
• B. Electronic fly-by-wire
• C. Hydraulic servos
• D. Pneumatic actuators

Answer: (A)

When the pilot moves a control, the movement is transmitted through a network of mechanical linkages—cables, rods, and pulleys—to the primary flight surfaces. This direct mechanical path is what makes the ailerons, elevator, and rudder respond immediately to the control input, giving the aircraft its predictable handling, as seen on conventional aircraft like the ATR. Hydraulic servos or electric actuators may power or amplify that movement, but the actual means of transferring the pilot’s input to the surface is the mechanical linkage. Fly-by-wire would replace this physical path with electronic signals and actuators, which is not the typical arrangement here.

When the pilot moves a control, the movement is transmitted through a network of mechanical linkages—cables, rods, and pulleys—to the primary flight surfaces. This direct mechanical path is what makes the ailerons, elevator, and rudder respond immediately to the control input, giving the aircraft its predictable handling, as seen on conventional aircraft like the ATR. Hydraulic servos or electric actuators may power or amplify that movement, but the actual means of transferring the pilot’s input to the surface is the mechanical linkage. Fly-by-wire would replace this physical path with electronic signals and actuators, which is not the typical arrangement here.