Hydraulic System

Nearly all airplanes are equipped with a  hydraulic system while small general  aviation airplanes may have small simple  hydraulic systems bigger jets have very  complex hydraulic systems  in smaller airplanes.

 The hydraulic  system powers the brakes to stop the  airplane extend and retract the landing  gear and change the blade angle on some  constant speed propellers as previously  discussed on larger airplanes like those  used by the airlines .

The hydraulic  system powers a majority of the airplane  including the flight controls and flaps  usually a hydraulic system consists of a  reservoir where the hydraulic fluid is  stored a pump that moves the fluid a  filter to keep contaminants out of the  system a relief valve in case of a  hydraulic malfunction and actuators  which the hydraulic system operates.