Do spoilers deploy symmetrically or asymmetrically during flight?

Spoilers are designed primarily to reduce lift and increase drag, and their deployment can vary based on the flight phase and the aircraft's intended maneuver. When an aircraft banks during a turn, the spoilers can deploy asymmetrically on one wing, which helps to counteract the increase in lift that occurs in the descending wing and reduces the risk of rolling over beyond a safe angle. This asymmetrical deployment enhances the aircraft's ability to maintain controlled flight during maneuvers.

Symmetrical deployment at all times is not accurate because while spoilers can be used symmetrically during landing or to reduce lift overall, the ability to deploy them asymmetrically is a crucial aspect of aircraft handling during turns. The deployment of spoilers only during landing does not capture their versatile use in flight dynamics. Lastly, stating that spoilers never deploy contradicts their operational purpose, as they are integral to managing lift and drag in various flight phases. Therefore, the correct understanding is that spoilers deploy asymmetrically for effective banking and maneuvering.