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accumulator pressure at 1500 psi. As well, reservoir quantity, overflow containers and
filter bypass indicators should be checked (see Figure 13-4).
Hydraulic systems are serviced with Skydrol-B, a fireretardant
fluid easily identified by its purplish color. It is
highly corrosive and can produce severe skin and eye
irritation. Avoid direct exposure to the fluid.
CAUTION
HYDRAULIC POWER
For Training Purposes Only
May 03
13-5
P I LOT T R A I N I N G GU I D E
Hydraulic System 2 Equipment Rack
Figure 13-4
Filters
Overflow
Bottle
Accumulator
Reservoir
P604_13_010
HYDRAULIC POWER
13-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
System 3
Description
The major components of hydraulic system 3 are two AC motor pumps (ACMP 3A
and 3B), an accumulator and a reservoir. ACMP 3A and 3B are located in the left and
right side fillets of the aft belly fairing, respectively. The accumulator, reservoir and
ground service panel are located in the right main wheel well (see Figure 13-6).
System 3 Schematic - Shown in-flight with Flaps Extended
Figure 13-5
To Flight Controls, Landing Gear, Inboard Wheel Brakes,
In-flight Wheel Braking, Nosewheel Steering, and Nose Doors
Reservoir
Accumulator
3B
ADG
GEN
3000 PSI Nominal
Supply Line
3A
GEN 2
On-line
Hyd Pump Tx
Contactor
ADG
Deployed
GEN 1
On-line
Flap Not
at 0°
P604_13_005
OFF
ON
3A
ON
OFF
AUTO
3B
AC BUS 2
ADG BUS
AC BUS 1
HYDRAULIC POWER
For Training Purposes Only
May 03
13-7
P I LOT T R A I N I N G GU I D E
Components and Operation
Main Pump
The main pump for system 3 is AC motor pump 3A (ACMP 3A). A two-position
toggle switch on the HYDRAULIC Panel labeled ON and OFF controls the 3A pump.
The 3A pump operates continuously with the switch in the ON position, provided AC
BUS 2 is powered (see Figure 13-5).
Backup Pump
The backup pump for system 3 is AC motor pump 3B (ACMP 3B). The operation of
ACMP 3B depends on hydraulic pump switch position, flap position, engine-driven
generator 1 or 2 output and emergency power mode activation (ADG deployment).
The 3B pump is controlled by a three-position toggle switch on the HYDRAULIC
Panel labeled AUTO, ON and OFF.
AUTO Position
With the switch in the AUTO position, the 3B pump operates when AC BUS 1 is
powered, either engine-driven generator is operating, and the flaps are not at zero (flap
position is greater than 4°). AUTO is the normal switch position for flight operations.
ACMP 3B does not automatically start after ACMP 3A failure.
ON Position
With the ACMP 3B switch in the ON position, the 3B pump will operate provided AC
BUS 1 is powered.
NOTE
HYDRAULIC POWER
13-8 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ADG Deployment
During ADG deployment ACMP 3B is automatically energized, regardless of its
switch position, by the ADG BUS through the Hydraulic Pump Transfer Contactor.
This ensures that hydraulic system 3 is available when AC BUS 1 and 2 are
unpowered. If AC power is subsequently restored by an engine-driven generator or the
APU generator, ACMP 3B will return to normal operation when the PWR TXFR
OVERRIDE switch is selected. For additional information on the PWR TXFR
OVERRIDE switch, see Chapter 7 Electrical System.
If ADG deployment is caused by a double engine failure, ACMP
3B will provide emergency hydraulic power to the primary flight
controls while all other pumps are inoperative or load shed.
To ensure priority to the primary flight controls, a spring-loadedclosed
priority valve cuts off hydraulic system 3 pressure to the
landing gear selector valves if hydraulic system 3 pressure drops
below 2100 psi. Alternate landing gear extension will be required
in this case.
NOTE
NOTE
HYDRAULIC POWER
For Training Purposes Only
May 03
13-9
P I LOT T R A I N I N G GU I D E
Accumulator and Reservoirs
System 3 has an accumulator that stores nominal hydraulic pressure to satisfy
instantaneous demands of aircraft systems and dampen pressure surges within the
system. The accumulator is precharged with nitrogen to 1500 psi.
System 3 reservoir is the largest of the three hydraulic systems with a capacity of 11.14
liters (2.94 U.S. Gal.). It is filled via the ground service panel located in the right main
wheel well.
During preflight, a visual inspection should include a check for accumulator pressure
　
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