What is the primary function of spoilers on aircraft?

The primary function of spoilers on aircraft is to assist in roll control during turns. Spoilers are movable surfaces located on the upper wing surface that can be deployed to disrupt airflow over the wings. When activated, they create a local decrease in lift on the side of the wing that they are deployed, allowing for more controlled responses during turns. This reduction in lift, paired with the resulting yawing motion, assists pilots in achieving sharper turns and maintaining controlled bank angles.

While spoilers can also influence drag and overall aerodynamic efficiency, their direct role in roll control is crucial during flight operations. They enable pilots to modify lift distribution across the wings, which is especially helpful during landing approaches and maneuvers that require significant changes in direction.