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ACMPs are inoperative in flight. This will provide a continuous pressure for up to 44
seconds from the reservoir suction line to the pump, enabling the RAT pump to come
on line quickly. There is a direct reading gauge to check the precharge condition of the
accumulator. Normal precharge pressure equals 1000 psi.
The brake control system uses an accumulator from hydraulic system 3 for brake
operations. There is a direct reading gauge to check the condition of the accumulator.
Normal precharge pressure of the brake accumulator equals 500 psi. Refer to Chapter
14, LANDING GEAR for more information on the brake control system.
GX_12_021
RAT
Accumulator
System 3
Brake
Accumulator
Direct Reading
Gauge
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-20 For Training Purposes Only
Sept 04
HYDRAULIC SYSTEM 3 SCHEMATIC
GX_12_022
Heat Exchanger
AC
PUMP
3A
RESERVOIR
Case
Drain Fluid
S
OW
S
P
DIGITAL
READOUT
EICAS
TO
AIRPLANE
SYSTEMS
S
P
ITEM OPERATES
Pressure switches
Pump Failure
Display to EICAS
Pressure transducer PSI display to EICAS
PRESSURE MANIFOLD
OW
Check valve indicates
direction of flow
Electrical input
Filter
Relief valve
System pressure
Suction pressure
LEGEND
AC
PUMP
3B
FLAPS OR SLATS OUT OF ZERO
PRIMARY PUMP PRESSURE SWITCH
AC POWER CENTER
ELECTRICAL LOGIC
AC BUS 4 AC BUS 1
HYDRAULIC
3A 3B
OFF
ON
OFF
AUTO
O
AU
O
ON
3000
PSI
For Training Purposes Only
Sept 04
12-21
P I LOT T R A I N I N G GU I D E
HYDRAULICS
RAT DEPLOYMENT HYDRAULIC SCHEMATIC
GX_12_023
Heat
Exchanger RESERVOIR
S
OW
S
P
DIGITAL
READOUT
EICAS
TO
AIRPLANE
SYSTEMS
S
P
ITEM OPERATES
Pressure switches
Pump Failure
Display to EICAS
Pressure transducer PSI display to EICAS
PRESSURE MANIFOLD
OW
Check valve indicates
direction of flow
Electrical input
Filter
Relief valve
System pressure
Suction pressure
LEGEND
AIRPLANE CONFIGURATION
AIR/GROUND SENSING
AC POWER CENTER
ELECTRICAL LOGIC
AC BUS 1 AC BUS 2 AC BUS 3 AC BUS 4
RAT
PUMP
RAT
ACCUMULATOR
AC
PUMP
3A
AC
PUMP
3B
Case
Drain Fluid
3000
PSI
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-22 For Training Purposes Only
Sept 04
HYDRAULIC CONTROL PANEL
The HYDRAULIC control panel is located on the overhead panel in the flight
compartment and contains the ACMP switches.
MANUAL MODE
Manual mode is accomplished by placing the respective ACMP control switch into
either the OFF or ON position. The pumps will run when selected to ON and their
respective bus is powered. In the OFF position each pump is inoperative for all
operating conditions.
AUTO MODE (PUMPS 1B, 2B AND 3B)
When the pump switch is set to AUTO, the respective pump automatically starts under
one of the following conditions:
• When the correct electrical logic is determined by the Alternating Current Power
Center (ACPC), either slats or flaps are not at the IN/0° position and at least one
Variable Frequency Generator (VFG) operating
• When the primary pump (EDP 1A, 2A or ACMP 3A) falls below normal system
pressure (≤ 1800 psi) in flight.
HYDRAULIC
1B 3A 3B 2B
OFF
AUTO
OFF
ON ON ON
ON
OFF
AUTO
OFF
AUTO
O
AU
O
AU
O
O
AU
GX_12_024
AC Motor Pump 1B and 2B
ON
OFF
AUTO
Controls the operation of each pump under the following conditions:
• – When the correct electrical logic is set, the applicable pump
will operate at normal operating pressure.
• – Pump is inoperative
• – Pump is in automatic/standby mode. Each pump will
energize when its system primary pump fails in flight, or when the
correct logic is set with slats/flaps not at 0-degree position.
AC Motor Pump 3A
ON
OFF
Controls the operation of the pump
in the following conditions:
• – When the correct electrical
logic is set, the pump will operate at
normal operating pressure.
• – Pump is inoperative.
AC Motor Pump 3B
ON
OFF
　
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