EDP SUPPLY SHUTOFF VALVE Shutoff Valves Figure 10
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MAINTENANCE MANUAL

 C.  The RESERVE BRAKE switch on the captain's main instrument panel P1 operates both valves and turns on the right ACMP.
 11. Heat Exchanger (Fig. 11)
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 A.  A heat exchanger in each system cools pump case drain fluid as the fluid returns to the reservoir. The three identical heat exchangers are in the wing fuel tanks and use fuel as a coolant. The left and right system heat exchangers are at the inboard end of the left and right main fuel tanks, respectively. The center system heat exchanger is adjacent to the left system exchanger. A minimum of 600 gallons (4020 pounds/1827 kilograms) of fuel is required in each main tank to provide hydraulic fluid cooling.
 12. Ground Power Connections (Fig. 1 and 2)
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 A.  Each hydraulic system can be pressurized from a hydraulic ground cart connected to the ground power connections. The left and right system connections are in the left and right engine struts, respectively. The center system connections are in the aft left wing/body fairing. At each location, the ground power connections consist of self-sealing quick-disconnects for the pressure and return lines.
 13. Hydraulic Control Panel (Fig. 12)
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 A.  The control panel is on the pilot's overhead panel, P5 and contains the pump select switches and system warning lights.
 B.  The pump select switch for each EDP and ACMP is a push-to-activate type and contains an ON light and pump low pressure light. The switch has a mechanical ON/DEPRESS indicator for the EDP's and ON/OFF for the ACMP's.
 C.  The panel has warning lights for low pressure and low fluid quantity in each system. Warning lights are provided for low pressure and overheat in each pump.
 14. Operation
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 A.  Functional Description - L and R Systems (Fig. 13, 14, and 15)
 (1)  The left and right systems operate the same. The system reservoir supplies a flow of fluid under pressure to the pumps. Fluid flows directly to the ACMP and through the EDP shutoff valve to the EDP. The output of the pumps flows through filters in the ACMP or EDP filter modules before going to the operating systems. Return fluid from the operating systems flows through a filter in the return module before entering the reservoir.
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