They usually increase both wing camber and area and are generally found on jets due to their expense, weight, and complexity. Which device is this?

• A. Ailerons
• B. Slats
• C. Leading edge flaps
• D. Trailing edge flaps

Answer: (C)

Leading-edge flaps (Krueger flaps) are high‑lift devices that extend from the wing’s front edge. When deployed, they increase the curvature of the wing (camber) and also enlarge the wing’s effective area, producing a substantial boost in lift at lower speeds. Because these mechanisms add complexity, weight, and cost, they’re more commonly found on jet aircraft. Slats also live on the leading edge and help with lift and stall characteristics, but they mainly create a slot and don’t significantly increase wing area. Ailerons control roll and don’t provide the high‑lift benefit described, and trailing-edge flaps increase camber and lift without appreciably changing the wing’s area. Hence, the device described is the leading-edge flap.