What is the primary function of the multifunction spoilers during flight?

The primary function of multifunction spoilers during flight is to increase drag. Spoilers are designed to disrupt the airflow over the wings when deployed, thereby increasing drag and reducing lift. This is particularly useful during descent and landing, as it allows the pilot to slow the aircraft and descend more rapidly without excessive airspeed. By increasing drag, spoilers help in controlling the aircraft's speed and improve its ability to descend at a steeper angle, facilitating smoother landings.

While multifunction spoilers do impact speed and can play a role in changing flight direction indirectly by affecting lift distribution, their main purpose is to enhance drag, which is essential for managing the aircraft's velocity and approach dynamics. This understanding highlights the importance of spoilers in the overall flight management system, ensuring that pilots can more effectively control their descent and landing trajectory.