Hydraulic+and+Pneumatic

Hydraulic and Pneumatic of an aeronautical application

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 * * Hydraulic and pneumatic systems are used in an airplane to control the landing gear, flight controls, air conditioning, and pressurization.


 * The hydraulic system controls the landing gear, speed brake, and thrust reverses and the pneumatic systems take care of the air conditioning, pressurization and the flight controls. || [[image:HydraulicSystem.jpg width="316" height="235" align="center" caption="Fig 12 Hydraulic System"]] ||
 * [[image:Landing-Gear.jpg width="321" height="238" align="center" caption="Fig 13 Landing Gear System"]] || * The landing gear is an integrated system which consists of the landing gear structure, the complicated door motion mechanism, locking mechanism, landing gear control module, and the interface between the landing gear system and the hydraulic system.


 * Normal and emergency hydraulic wheel systems are controlled by mechanical inputs from the brake pedals.


 *  When the pedals are pressed, proportional pressure from the right hydraulic system is metered by the power valve and the anti-skid controls’ valve.


 *  Under normal operation, hydraulic pressure is directed to the brakes. If any of the brake lines is broken, the hydraulic fuse on that side prevents loss of excessive fluid and shuts off flow to the affected brake.


 * The anti-skid system prevents wheel skidding by limiting application of main hydraulic system pressure to brakes, thereby permitting shorter landing roll and minimising Tyre wear. ||
 * Cabin pressurization is the pumping of compressed air into an aircraft cabin to maintain a safe and comfortable environment for crew and passengers.

 Air is pressurized by the engines and at the point where the heat and pressure are highest, some hot, high pressure air is sent to DE-ice the wings, some go to the system operated by air pressure, and some start its journey to the cabin, but before it reaches the cabin it must be cooled in an inter cooler. || media type="youtube" key="120KZnPHKH8" height="250" width="447" align="center" ||