Krueger flaps are essential high-lift devices found on the leading edges of some aircraft wings. They work similarly to slats but operate in a unique way. These flaps are attached to the underside of the wing and are hinged at their front edges. When deployed, actuators move the flaps down and forward, effectively increasing the wing’s camber and boosting lift.
In early jet airliners like the Boeing 707 series, Krueger flaps were the only high-lift devices used at the leading edge. Today’s aircraft often utilize either slats exclusively or a mix of slats and Krueger flaps. Notable examples of planes that feature this combination include the Boeing 747 and the 737-700. Understanding how Krueger flaps function helps us appreciate their role in enhancing aircraft performance during takeoff and landing.
