To increase lift during landing, which device would a pilot deploy?

Leading edge slats are devices found on the wings of an aircraft, specifically designed to enhance lift at lower speeds, which is particularly critical during landing. When deployed, these slats modify the airflow over the wing, effectively increasing the wing's camber and surface area. This allows the aircraft to generate more lift at slower speeds, which is essential for maintaining controlled flight during the landing phase.

The slats extend the critical angle of attack, allowing the wings to remain effective without stalling at the slower speeds encountered during approach and landing. This results in better handling characteristics, decreased landing distance, and greater safety margins during critical phases of flight. Their primary role is to help manage lift effectively when needed most, which directly supports the objectives of a safe landing approach.

Other devices mentioned, such as speed brakes, are used primarily to reduce speed and descent rate rather than increase lift. The rudder and ailerons play roles in controlling the aircraft's direction and roll but do not directly contribute to lift generation in the context of landing. Therefore, leading edge slats are the most suitable answer for increasing lift during landing.