Commercial Pilot License (CPL) 2025 – 400 Free Practice Questions to Pass the Exam

The correct placement of spoilers on an aircraft's wing is on the upper surface of the wing. Spoilers are devices used to disrupt the airflow over the wing to reduce lift and increase drag, primarily used during descent and landing phases to lower the aircraft's speed and assist in descent rate. By positioning them on the upper surface, they effectively change the airflow characteristics over the wing, making them functional for improving control and stability during these phases of flight.

Other potential locations, such as the leading edge or the bottom surface, would not provide the same level of effectiveness in altering the airflow and achieving the intended aerodynamic effects. Leading-edge devices, for example, are designed to improve lift at lower speeds rather than disrupt it. Wingtip devices aim to enhance overall aerodynamic efficiency and reduce drag due to wingtip vortices, so they serve a different purpose altogether. Thus, the correct and most effective location for spoilers to function is indeed on the upper area of the wing.