How do leading edge flaps affect an aircraft during flight?

Leading edge flaps primarily serve the function of enhancing an aircraft's lift at lower speeds, particularly during takeoff and landing phases. When deployed, these flaps increase the camber of the wing, allowing for a higher angle of attack without triggering a stall. However, this increased camber and the interruption of smooth airflow can result in an increase in overall drag.

While leading edge flaps are essential for improving lift capabilities, their effect on drag is significant; the deployment of the flaps creates additional flow separation that can increase the resistance the aircraft experiences through the air. This phenomenon is particularly noticeable when the aircraft is flying at slower speeds. Therefore, the correct answer reflects the direct impact of leading edge flaps on drag during those flight conditions.