A320 HYDRAULICS
Hydraulic power is supplied by three independent hydraulic circuits called, the Green, Blue and Yellow systems. The normal hydraulic system pressure is 3000 psi. Each system is supplied by its own pneumatically pressurized reservoir and it is not possible to transfer fluid from one system to another.
GREEN SYSTEM
The green system is pressurized by the number 1 engine-driven hydraulic pump. There is a fire shutoff valve located upstream of the pump which is operated by the ENG 1 FIRE pb. There are two pressure sensors located downstream of the pump, one sends the system pressure to the ECAM and the other to the Power Transfer Unit (PTU). Downstream of the pressure sensors there is a non-return valve, a system accumulator, a leak measurement valve, the various user components, a priority valve, two load alleviation function (LAF) accumulators and the PTU hydraulic line.
BLUE SYSTEM
The blue system is pressurized by an electric motor-driven hydraulic pump. There is also a ram air turbine (RAT) that can pressurize the blue system to approximately 2500 psi in an emergency. There are two pressure sensors located downstream of the pumps which send system pressure to the ECAM. Downstream of the pressure sensors there is a system accumulator, a leak measurement valve, the various user components and a priority valve.
YELLOW SYSTEM
The yellow system is pressurized by the number 2 engine-driven hydraulic pump. There is a fire shutoff valve located upstream of the pump which is operated by the ENG 2 FIRE pb. This system also includes an electric motor-driven pump and a hand pump for operation of the cargo doors when electric power is not available. There are two pressure sensors located downstream of the pumps, one sends the system pressure to the ECAM and the other to the (PTU). Downstream of the pressure sensors there is a non-return valve, a system accumulator, a leak measurement valve, the various user components, a priority valve, two (LAF) accumulators and the PTU hydraulic line.
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