What function do spoilers serve on an airplane?

Spoilers are aerodynamic devices located on the wings of an airplane, primarily designed to disrupt the airflow over the wing. Their main function is to reduce lift and increase drag during specific phases of flight, particularly during landing or descending.

When deployed, spoilers increase aerodynamic drag, which helps to slow the aircraft down. Simultaneously, they reduce the lift generated by the wings, which is particularly valuable when the aircraft is on approach to land. By decreasing lift, spoilers effectively aid in achieving a steeper descent angle without the need for the aircraft to pitch down excessively.

Their ability to enhance drag also helps in controlling the aircraft's descent rate and allowing for more precise landing performance. This capability is crucial in managing the aircraft's speed and altitude during critical phases of flight, ensuring safety and stability.

In summary, the primary function of spoilers is to reduce lift and increase drag, making them integral to the aircraft's performance and safety during landing approaches and slow-flight operations.