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compartment.
During normal operations, system 1 provides hydraulic pressure to the left side
primary flight controls and rudder, left and right flight spoilers, left and right ground
spoilers, and the left thrust reverser. System 2 provides hydraulic pressure to the right
side primary flight controls and rudder, left and right flight spoilers, main gear assist
(left and right main landing gear extension/retraction), right thrust reverser and
outboard brakes.
SYSTEM 3
System 3 is powered by two ACMPs designated as 3A and 3B, and are selectable
through switches located on the HYDRAULIC control panel in the flight
compartment. The ACMPs 3A and 3B provide hydraulic pressure to the primary flight
controls (all), left and right ground spoilers, landing gear side brace actuator and
doors, inboard and park/emergency brakes, and the nose wheel steering.
Hydraulic pump 3A normally runs continuously while pump 3B is used as an essential
pump for takeoff, approach, landing, and in support of the primary pump 3A in the
event of failure.
EMERGENCY HYDRAULIC POWER
In the event that all normal electrical power is lost, a Ram Air Turbine (RAT) is
deployed and will power an independent hydraulic pump for system 3.
HYDRAULIC ACCUMULATORS
The RAT uses an accumulator to maintain pressure at the reservoir during RAT
deployment. Two additional hydraulic accumulators are installed on the airplane and
are used by the brake control system. One is used for brake system 2, and the other for
brake system 3 emergency operation.
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-2 For Training Purposes Only
Sept 04
DISTRIBUTION TABLE SCHEMATIC
GX_12_001
SYSTEM NO. 1 SYSTEM NO. 3 SYSTEM NO. 2
RUDDER
RIGHT
ELEVATOR
RIGHT
AILERON
LEFT AND RIGHT
MULTIFUNCTION
SPOILERS
MAIN LANDING
GEAR
OUTBOARD
BRAKES
RUDDER
LEFT
ELEVATOR
LEFT
AILERON
LEFT AND RIGHT
MULTIFUNCTION
SPOILERS
LEFT AND RIGHT
GROUND SPOILERS
LEFT
REVERSER
RUDDER
LEFT AND
RIGHT ELEVATOR
LEFT AND
RIGHT AILERON
LANDING GEAR
NOSEWHEEL
STEERING
LEFT AND RIGHT
GROUND SPOILERS
GEAR
DOORS
INBOARD AND
PARK/EMER
BRAKES
RIGHT
REVERSER
ENGINEDRIVEN
PUMP
(1A)
AC
MOTOR
PUMP
(1B)
ENGINEDRIVEN
PUMP
(2A)
AC
MOTOR
PUMP
(2B)
AC
MOTOR
PUMP
(3A)
AC
MOTOR
PUMP
(3B)
RAT
PUMP
For Training Purposes Only
Sept 04
12-3
P I LOT T R A I N I N G GU I D E
HYDRAULICS
HYDRAULIC SYSTEM DISTRIBUTION SCHEMATIC
GX_12_002
SYSTEM 3
SYSTEM 1
ELEVATOR LH ELEVATOR RH
AILERON LH AILERON RH
MFS 2
LH
MFS 4
LH
MFS 3
LH
GRND SP
RH OUTBD
GRND SP
LH OUTBD
MFS 1
LH
THRUST REV
LH
THRUST REV
RH
GRND SP
LH INBD
GRND SP
RH INBD
NLG
UPLOCK
NLG
ACTUATOR
NLG
DOORS
NLG
DOWNLOCK
NLG
STEERING
RH MLG
ACTUATORS
LH MLG
UPLOCK
MLG
DOORS
LH MLG
ACTUATORS
RH MLG
UPLOCK
PARKING
BRAKE
BRAKE
LH OUTBD
BRAKE
LH INBD
BRAKE
RH OUTBD
BRAKE
RH INBD
ACMP 3A ACMP 3B RAT
PUMP
EDP
1A
ACMP
1B
SYSTEM 2
ACMP
2B EDP
2A
RUDDER
MFS 2
RH
MFS 4
RH
MFS 3
RH
MFS 1
RH
LH MLG
SIDEBRACE
RH MLG
SIDEBRACE
Note:
MFS = Multifunction Spoiler
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-4 For Training Purposes Only
Sept 04
SYSTEMS OVERVIEW SCHEMATIC
GX_12_003
System pressure 1
System pressure 2
System pressure 3
AC motor pump
Engine-driven pump
RAT hydraulic pump
Central Hydraulic
System Components
• Filters
• Reservoir
• Relief Valve
• Press/temp Sensing Multifunctional Spoilers
Reverser
Rudder
Aileron
Ground Spoiler
Heat Exchanger Landing Gear
Steering and Brakes
Accumulators
System 3 RAT (forward)
System 3 Brake (aft)
Elevator
LEGEND
RAT Pump
Accumulator
System 2 Brake
For Training Purposes Only
Sept 04
12-5
P I LOT T R A I N I N G GU I D E
HYDRAULICS
HYDRAULIC SYSTEM INDICATION
　
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