YELLOW MAIN HYDRAULIC POWER - TASK SUPPORTING DATA
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 1. System Description
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 301)

R **ON A/C 401-499,
R (Ref. Fig. 301A)
R **ON A/C ALL
 The Yellow main hydraulic system has the subsequent sub-systems:
 - a HP system which supplies consumers,

 - a LP or return system through which the fluid returns to the reservoir,

 - a suction system.

 A. HP System The HP system is usually pressurized by an engine-driven pump (EDP) 1030GD connected to the right (No 2) engine. The EDP is connected directly to the engine and operates together with it. A solenoid valve makes it possible to stop the supply of fluid from the EDP. The solenoid valve is operated from the flight compartment with the P/B switch 3703GD.

 The power transfer unit (PTU) 1088GM can also pressurize the Yellow HP circuit. The PTU gets its power from the Green main system. It supplies power to the Yellow system automatically if the system pressure falls to 500 psi (34.5 bar) below the pressure in the Green system. There is no hydraulic connection between the two systems so fluid can not get from one system to the other.
 If the EDP fails or for maintenance on the ground, it is possible to pressurize the Yellow hydraulic system with the electric pump 3075GX. The output of the electric pump is connected to the HP supply.
 On the ground, it is possible to pressurize the system from a ground supply through the self-sealing connectors on the ground service panel.
 The supply to all consumers (except cargo doors and thrust reverser) goes through the HP manifold 3011GM. The HP manifold has pressure switches, a filter, a check valve, a transmitter, a solenoid valve and other components which control the system. The supply from the HP manifold to all consumers other than the flap motors also goes through the leakage-measurement system manifold 3146GM. Thus it is possible to isolate some consumers to measure the internal leakage of parts of the system.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞29-13-00∞∞∞∞∞∞∞∞∞∞Page 301
 Aug 01/05 CES

 Hydraulic Schematic
 Figure 301

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞29-13-00∞∞∞∞∞∞∞∞∞∞Page 302
 201-299, 301-399, Aug 01/05 CES

R Hydraulic Schematic R Figure 301A
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞29-13-00∞∞∞∞∞∞∞∞∞∞Page 303
 Aug 01/05 CES The supply to the alternate and parking brake systems goes from the HP manifold through the brake manifold 3016GM.

 B. LP System The LP system 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 system. The system has check valves where applicable to control the flow of fluid. The check valves also protect the main system if there is a leak in a subsystem. Some of the return lines are connected together at the LP manifold 3003GM. Part of the LP system is also used in the reservoir filling system.
 The LP fluid goes through the LP filter 3002GM before it gets to the
 system reservoir 3000GQ.
 A filter 3084GM is also installed in the EDP case drain line to the LP
 system.

 The system reservoir 3000GQ is installed in the Yellow hydraulic
 compartment.
 The reservoir is filled through the reservoir filling system which is
 operated from the ground service panel of the Green system. A reservoir
 drain valve is installed on the reservoir.
 The reservoir is pressurized with air to 3.5 bar (50 psi). The supply of
 air comes from the aircraft pneumatic system. It is also possible to
 pressurize the reservoir from a ground supply. A depressurization valve
 3087GM is installed on the ground service panel of the Yellow system.

 C. Suction System The engine pump 3030GD gets its supply of fluid directly from the Yellow reservoir 3000GQ. The fire shut-off valve 3046GD permits to isolate the supply of the engine pump.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞29-13-00∞∞∞∞∞∞∞∞∞∞Page 304
　
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