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come on automatically during takeoff, approach and landing, or in support of a
primary pump failure.
ACMPs 1B and 2B are powered from AC bus 3 and AC bus 2, respectively. Both
pumps are controlled by separate toggle switches on the flight compartment
HYDRAULIC control panel. Refer to External and APU Power - ACMP Operation
Electrical Pump operation in this chapter for external/APU ground services.
FILTER MANIFOLD
The filter manifold for system 1 is located on the left side of the aft equipment bay, and
on the right side for system 2. Each hydraulic system accommodates pressure, return
and case drain (pump lubrication fluid) filters, and a system pressure relief valve. They
also contain filter “pop-up” indicators to show when the filters are clogged. Two
pressure switches and a transducer are part of the pressure manifold and are used to
provide EICAS displays for pump failures and loss of system pressure. Fluid quantity
and temperature transducers are located on the reservoir and are indicated on the
HYDRAULIC synoptic page.
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-12 For Training Purposes Only
Sept 04
HYDRAULIC SHUTOFF VALVE CONTROL PANEL
Two switches are provided on the HYDRAULIC shutoff valve panel to isolate the
applicable shutoff valve in the event of a hydraulic overtemperature. These switches
should not be selected closed with the engine running except for isolation in the event
of system overtemperature. The engine-driven pump will cavitate and greatly reduce
the efficiency and life of the pump.
The purpose of isolation is to permit the fluid to cool and control the overtemperature,
without having to shut down the engine. These switches operate in parallel with the
switch in the fire handle to control the operation of the applicable hydraulic shutoff
valve.
HYDRAULIC SHUTOFF VALVES
Electrically-operated shutoff valves (normally open) are installed on the suction lines
for the engine-driven pumps 1A and 2A, and their position is indicated on the
HYDRAULIC synoptic page.
HYDRAULIC
R HYD SOV
CLOSED
L HYD SOV
CLOSED
GX_12_012
Left/Right Hydraulic Shutoff Valve Switches
Controls the operation of the hydraulic shutoff
valve in the following condition:
• CLOSED – When the switch is selected, it
isolates the hydraulic fluid to the respective
engine-driven pump by closing the hydraulic
shutoff valve.
R HYD SOV
CLOSED
GX_12_013
3A 3B 2B
HYDRAULIC
22 °C
1B
62%
38 °C
61%
20 °C
60%
DISCH
1 2
RPULL
HYDRAULIC SYNOPTIC PAGE
NOTE:
The right SOV
is shown, left is
similar.
For Training Purposes Only
Sept 04
12-13
P I LOT T R A I N I N G GU I D E
HYDRAULICS
The corresponding hydraulic shutoff valve is motored closed during an engine fire
condition (fire handle pulled), or selection of a HYD SOV switch. Selection of a HYD
SOV switch will illuminate a CLOSED legend on the switch to indicate the switch
position. When the hydraulic shutoff valve is closed, a L or R HYD SOV CLSD white
status message (described in Chapter 9, FIRE PROTECTION) is displayed on EICAS.
Deselection of either the fire handle or HYD SOV switch will command the SOV
open, and extinguish the message. Deselecting the HYD SOV switch will extinguish
the CLOSED legend.
HEAT EXCHANGER
System 1 heat exchanger is positioned within the left fuel feed tank, and system 2 in
the right. The purpose of each exchanger is to cool the case drain fluid (lubrication
fluid within each pump), prior to returning it to the reservoir.
If the fluid temperature is sufficiently cooled, a by-pass of the exchanger will allow the
fluid to go directly to the reservoir. Fuel in the wing feed tank is the cooling medium.
GX_12_014
System 2 Heat
Exchanger
Heat
Exchanger
System 1 Heat
Exchanger
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-14 For Training Purposes Only
Sept 04
SYSTEM 2 ACCUMULATOR
The brake control system uses an accumulator from hydraulic system 2 for brake
operations.
There is a direct reading gauge to check the precharge condition of the accumulator.
Refer to Chapter 14, LANDING GEAR for more information on the brake and control
system.
GROUND SERVICE ACCESS
The ground service access for systems 1 and 2 is located in the aft equipment bay.
GX_12_015
SYSTEM 2
BRAKE
ACCUMULATOR
DIRECT
READING
GAUGE
For Training Purposes Only
Sept 04
12-15
P I LOT T R A I N I N G GU I D E
　
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