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outflow lines provide low-pressure indications to the flight crew. The discharge, suction and case drains ports of the pump
include quick-disconnect fittings and are connected directly to the aircraft systems through hoses. The case drain port is
located on the top side of the pump near the mounting flange for maximum case drain cooling of pump components. This
location also assures bleeding of air after installation of a new pump. The pump incorporates a solenoid isolation/actuation
valve to reduce discharge pressure and torque when energized. During an engine windmill restart, the solenoid will be activated
by the FADEC to depressurize the pump.The left EDP flow and left DCMP flow combines in the left filter manifold.
The right EDP flow and right DCMP flow combines in the right filter manifold. The hydraulic fluid is never mixed between
the left and right systems.
DC MOTOR-DRIVEN PUMP
The left and right hydraulic systems each have one DC Motor-driven Pump (DCMP). The primary purpose of the DCMPs
is to pressurize the hydraulic systems during an engine or EDP failure. The DCMP serves also the ground maintenance
operation purposes. The DCMP contains a DC electric motor which is attached to a variable-delivery hydraulic pump. The
DC motor operates the pump, which can change the volume of fluid flow to maintain the necessary system pressure. The
left and right hydraulic system DCMPs are installed on their respective side of the aft equipment compartment.
Electrical power is supplied by the DC bus through an electrical connector on the DCMP. The generator of the right engine
supplies power to the left DCMP. The generator of the left engine supplies power to the right DCMP.
The left and right DCMPs are each controlled by a three-position switch. The switch positions are OFF, AUTO, and ON.
The OFF and ON allow manual operation. The AUTO position is the normal position for flight. In this position, the DCMPs
will be off with flaps up, and on with flaps set at 10° or greater. In addition, if low hydraulic system pressure is detected,
the DCMP will automatically turn on.
HYDRAULIC SHUTOFF VALVE
Each of the left and right hydraulic systems contain a firewall shutoff valve (SOV) placed in the EDP suction line outside
of the pylon area. In the case of engine fire, this valve can be closed to stop hydraulic fluid from reaching the engine area.
Both SOVs are located inside the aft equipment compartment forward of the hatch opening. The valves are normally in the
open position, however, pressing the L (R) SOV push button on the HYDRAULIC control panel or the L (R) ENG FIRE
push button on the ENGINE control panel closes the corresponding hydraulic shutoff valve. Control logic also closes the
valve automatically when the system fluid temperature exceeds 275 °F. When a firewall SOV is operated, the DCMPs are
the only hydraulic pressure source available for the left or right hydraulic systems.
HYDRAULIC RESERVOIR
Each of the hydraulic systems contains a reservoir for the storage of hydraulic fluid. The reservoir provides the necessary
fluid volume demanded by the hydraulic system, including pressurization of the pump inlet. Changes in the fluid volume
due to thermal expansion/contraction, system leakage and differential area of the user actuators have been taken into account
in sizing and volume of each reservoir. The left and right hydraulic system reservoirs are installed on their respective
sides in the aft equipment compartment. The fluid volume of the left hydraulic reservoir is 13 quarts (12.3 liters). The fluid
volume of the right hydraulic reservoir is 9.1 quarts (8.6 liters). Each reservoir has a bleed/relief valve, visual quantity indicator,
suction shutoff valve, and ports for installation of the temperature switch and temperature transducer. There is also
a check valve installed in the fluid return port.
The bleed valve is accessible to maintenance personnel and is manually opened by depressing a lever. When released, the
lever automatically returns to the closed position. The location of the valve at the high point of the reservoir, as well as the
routing of the internal porting to the valve, assures that air in the fluid will migrate to the outlet and be released when the
valve is opened. Flow from the valve is routed to the ecology bottle.
HYDRAULICS
Volume 2 Flight Crew Operating Manual May 06/2005
13-01-04 CSP 100-6 REV 2
LEFT AND RIGHT HYDRAULIC SYSTEM (Cont)
The visual quantity indicator is a gauge that shows the hydraulic fluid level in the reservoir. The gauge has marks from zero
to 100% in increments of 10%. The indicator senses the position of the low-pressure piston as a measure of the remaining
fluid volume. The quantity indicator also sends an electrical output signal to the Remote Data Concentrator (RDC), which
　
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