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Thrust reversal

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marcosurbina
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Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's exhaust or changing of propeller pitch so that the thrust produced is directed forward, rather than aft. This acts against the forward travel of the aircraft, providing deceleration. Thrust reversers are used by many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing distances. It is also available on many propeller aircraft through reversing the controllable pitch propellers to a negative angle.

Once the aircraft's speed has slowed, thrust reverse is shut down to prevent the reversed airflow from raising debris in front of the engine intakes where it can be ingested, causing foreign object damage.
iceman
Active Ink Slinger
That is very common with large aircraft. You will also notice in the video, that there is a vertical piece just inboard of the inboard engine, that's an air brake. on the leading edge of the wings are "spoilers". These are designed to increase the wing size and also to disrupt the airflow...decreasing or increasing lift as necessary, depending on the use of the trailing flaps, which are shown fully deployed in the bottom picture.