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**ON A/C ALL
The Low Pressure (LP) circuit returns the fluid from the consumers to the reservoir. The case drains of the EDP and PTU, and the returns from the HP manifold are also connected to the LP circuit. The circuit has check valves where applicable to control the flow of fluid. Some of the return lines are connected together at the LP manifold. Part of the LP circuit is also used in the reservoir filling system (Ref. 29-16-00).
The LP fluid goes through the LP filter 3002GM before it gets to the reservoir. The filter has a filtration rating of 3 microns. If the filter element clogs, a by-pass operates and unfiltered fluid goes to the reservoir. The temperature sensor (3318GR), which is attached to the outlet of the LP filter, monitors the temperature of the return fluid. The temperature information is sent to the ECAM and warning systems (Ref. 29-33-00).
A filter 3084GM is installed in the EDP case drain line to the LP system. It has a filtration rating of 15 microns.
The reservoir 3000GQ is installed in the Yellow hydraulic compartment. It holds a supply of fluid and also makes allowance for differences of the quantity of the fluid in the system (because of different positions of jacks for example). The reservoir holds 12 l (3.18 USgal) of hydraulic fluid when it is filled to the correct level.
The reservoir is filled through the reservoir filling system (Ref. 29-16-00) which is operated from the ground service panel of the Green hydraulic system. A reservoir drain valve is installed on the reservoir.
The reservoir is pressurized with air to 50 psi (3.5 bar) to stop cavitation at the inlet to the EDP (Ref. 29-14-00). The supply of air comes from the pneumatic system of the aircraft (Ref. 36-00-00). It is also possible to pressurize the reservoir from a ground supply. A depressurization valve is installed on the ground service panel of the Yellow hydraulic system. A PRV and air pressure gage are installed on the reservoir. A motorized fire valve 3046GD is installed in the suction line between the reservoir and the EDP. It operates when the engine fire pushbutton in the flight compartment is operated. The valve stops the supply of fluid to the EDP if there is a fire in the nacelle. A compensated slide 3010GM is installed in the suction line between the reservoir and the EDP. It compensates for differences in pipe length, caused by changes in temperature, or normal movement of the wing in flight.
4. Power Supply
____________ R (Ref. Fig. 011, 012)
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R Yellow Engine Pump - Control and Monitoring Figure 011
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R Engine 2 - Fire Valve Control Figure 012
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5. Component Description_____________________
A. Reservoir 3000GR
R **ON A/C 001-003, 051-054,
R (Ref. Fig. 013)
R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
R (Ref. Fig. 013A)
**ON A/C 001-003, 051-054,
The reservoir is made of two molded light alloy sections which are welded together to make a cylindrical shape. The top of the reservoir has a manifold for the components of the air pressurization system (Ref. 29-14-00). The bottom of the reservoir has three ports for the hydraulic connections. A drain valve is installed on one of the ports, the other two are for the suction and return line connections. The reservoir also has flanges to attach the quantity indicator/transmitter and the low level switch (Ref. 29-31-00).
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