Virtually all aircraft make use of some hydraulically powered components. In light, general aviation aircraft, this use might be limited to providing pressure to activate the wheel brakes. In larger and more complex aeroplanes, the use of hydraulically powered components is much more common. Depending upon the aircraft concerned, a single hydraulic system, or two or more hydraulic systems working together, might be used to power any or all of the following components: wheel brakes, nose wheel steering, landing gear retraction/extension, flaps and slats, thrust reversers, spoilers/speed brakes, flight control surfaces, cargo doors/loading ramps, windshield wipers and propeller pitch control.

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