It is expected to have redundancy in most parts of design of a plane. I wonder about the engine. Is it about balancing the load by controlling roll angle in case of a failure in one of the engines?
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It isn’t roll so much as rudder, which controls yaw. The rudder is adjusted to compensate for the uneven thrust in the event of engine failure so the aircraft can continue to fly a desired path despite “crabbing” as it points off to the side.
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