Leading edge devices are an example of which type of flight controls?

• A. Primary flight controls
• B. Secondary flight controls
• C. Trim systems
• D. Propulsion controls

Answer: (B)

Leading edge devices change the wing’s lift characteristics rather than directly commanding aircraft attitude. They like to increase camber to boost lift at lower speeds and improve stall behavior, which is why they’re grouped with other high‑lift activities rather than as primary control surfaces. Trim systems, on the other hand, are used to hold the airplane in a chosen attitude with less pilot effort; they don’t actively change lift during maneuvering. Propulsion controls are a separate system altogether. So, leading edge devices are best described as secondary flight controls.