A hydraulic drive system is a quasi-hydrostatic drive or transmission system that uses pressurized hydraulic fluid to power hydraulic machinery. The term hydrostatic refers to the transfer of energy from pressure differences, not from the kinetic energy of the flow. A hydraulic drive system consists of three parts: The Pump, driven by an electric motor or a combustion engine or a windmill; valves, filters, piping etc. and the actuator.An aircraft hydraulic system just like all other hydraulic system is used to control some mechanical movements in the system. The hydraulic system if used for...