What does the Blue Hydraulic System primarily use for pressurization?

The Blue Hydraulic System on the A320 primarily utilizes an electric motor driven pump for pressurization. This pump is engineered to deliver hydraulic fluid under pressure, which is essential for operating various systems on the aircraft such as flight controls, landing gear, and brakes.

The choice of an electric motor driven pump allows for more efficient and reliable operation, as it can provide the necessary hydraulic pressure without depending on engine-driven systems. This design contributes to the overall redundancy and safety of the aircraft’s hydraulic systems.

Other options would not be the primary means of pressurization for the Blue Hydraulic System. While a Ram Air Turbine can generate hydraulic power as an emergency backup, it is not the main source. A Ground Power Unit is used to provide electrical power while the aircraft is on the ground but does not contribute to hydraulic system pressurization. Similarly, an Auxiliary Hydraulic Pump may support hydraulic functions but also does not serve as the primary source of pressure for the Blue Hydraulic System.