What opposes asymmetric thrust in a multi-engine aircraft?

In a multi-engine aircraft, asymmetric thrust occurs when one engine produces more thrust than the other, typically during an engine failure or when operating at certain power settings. This situation can cause the aircraft to yaw toward the engine that is producing less thrust, requiring control inputs to maintain straight and level flight.

The most effective way to counteract this yaw is by using the rudder. Applying rudder input towards the engine that is still producing thrust (the "good" engine) helps realign the aircraft with the intended flight path and provides stability. This action is critical in maintaining control and preventing the aircraft from rolling toward the inoperative engine.

While ailerons can help manage lateral balance and control, they are not primarily designed to counteract asymmetric thrust. Instead, they are used for turning and maintaining level flight by controlling roll. Elevators and flap settings play roles in pitch and lift, respectively, but they don't directly address the yawing effect caused by unequal thrust. Therefore, using rudder input toward the operating engine is the most effective method to oppose asymmetric thrust in a multi-engine aircraft.