Modern twin-engine passenger aircraft clearly require that single engine failure can ensure safe landing. The most difficult problem after single engine failure is not the disappearance of engine thrust, but the deflection of engine thrust. A twin-engine plane is balanced when both engines are working normally. If one engine fails, the overall thrust of the aircraft will be out of balance. If no adjustment is made, the plane will drift to the side of the failed engine. So it needs special treatment.

After a single engine failure occurs, the pilot will start the rudder, cooperate with the wing and even the spoiler to prevent the aircraft from yawing. The operational burden of preventing aircraft from yawing is heavy. Although the pilot is familiar with the operation process, he finishes the work under tension. Therefore, under normal circumstances, the most experienced captain will take over the control of the aircraft to ensure that the situation is handled safely and effectively.