Which parameter increases with the use of leading-edge flaps during approach?

The use of leading-edge flaps during an aircraft's approach significantly increases the lift generated by the wings. When extended, these flaps alter the airflow over the wing, allowing the aircraft to maintain lift at lower speeds. This is particularly beneficial during landing and approach phases, as it enables the pilot to fly at slower airspeeds without risking a stall.

Leading-edge flaps help in delaying airflow separation on the top surface of the wing, effectively increasing the wing's camber and overall surface area. As a result, the aircraft can achieve higher lift coefficients, which is crucial for maintaining controlled flight during the approach at reduced speeds.

While the use of leading-edge flaps does increase drag as well, the primary purpose of deploying them is to enhance lift, making it a critical aspect of approach performance. Other parameters such as weight and stalling speed do not directly increase due to the deployment of leading-edge flaps; in fact, stalling speed typically decreases in terms of the critical angle of attack required to achieve lift, and weight remains constant.