Auxiliary flight controls include high-lift devices used during low-speed flight. Which devices are typically included?

• A. Leading and trailing edge flaps, slats, slots, and speed brakes.
• B. Neutral control cables and springs.
• C. Ailerons, elevators, and rudder.
• D. Vortex generators and spoilers.

Answer: (A)

When flying at low speed, the wing needs extra lift and a greater margin before stall. That’s achieved by devices that change the wing’s shape or airflow. Leading-edge devices such as slats and slots energize the airflow over the wing at high angles of attack, delaying flow separation so you can fly slower without losing lift. Trailing-edge devices, like flaps, increase the wing’s camber and sometimes its effective area, which raises the lift produced at lower speeds. Some aircraft also use leading-edge flaps to boost lift further. Speed brakes are included here because they are part of the auxiliary flight-control system used during approach and descent to manage speed and descent rate; while they primarily add drag, their presence in the system is part of how the airplane handles low-speed situations. The other options describe mechanisms or surfaces that aren’t the typical high-lift devices used for low-speed lift: neutral cables and springs are merely controls hardware, primary control surfaces handle aircraft axes of motion, and vortex generators or spoilers serve different aerodynamic purposes rather than acting as standard high-lift devices for low-speed flight.