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belly fairing, respectively. The accumulator, reservoir and ground service panel are located in the
right main wheel well (see Figure 13−10−6).
HYDRAULIC POWER
Description
Vol. 2 13−10−5
REV 67, Mar 19/07
CL−604 Operating Manual
PSP 604−6
SYSTEM 3 (CONT'D)
Hydraulic System 3 − Shown In-flight with Flaps Extended
Figure 13−10−5
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 13−10−5).
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.
NOTE
ACMP 3B does not automatically start after ACMP 3A failure.
HYDRAULIC POWER
Description
Vol. 2 13−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
SYSTEM 3 (CONT'D)
ON Position
With the ACMP 3B switch in the ON position, the 3B pump will operate, provided AC BUS 1 is
powered.
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.
NOTE
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.
NOTE
To ensure priority to the primary flight controls, a
spring-loaded-closed priority valve cuts off hydraulic system 3
pressure to the landing gear selector valves if hydraulic system 3
pressure drops below 2,100 psi. Alternate landing gear extension
will be required in this case.
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 1,500 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 at
1,500 psi. With the exception of the accumulator gauge, system 3 components are not readily
accessible with the wheel well bins installed.
HYDRAULIC POWER
Description
Vol. 2 13−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
SYSTEM 3 (CONT'D)
Hydraulic System 3 Accumulator Gauge
Figure 13−10−6
CONTROLS AND INDICATORS
The HYDRAULIC panel provides the system controls; the EICAS hydraulic synoptic page provides a
pictorial representation of the system status, and the EICAS primary and status pages provide the
system caution and advisory messages respectively (see Figure 13−10−7, Figure 13−10−8,
Figure 13−10−9 and EICAS Messages table).
HYDRAULIC POWER
Description
Vol. 2 13−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
HYDRAULIC Panel
Hydraulic Panel
Figure 13−10−7
HYDRAULIC POWER
Description
Vol. 2 13−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
Hydraulic Synoptic Page
EICAS Hydraulic Synoptic Page Color Coding (1 of 2)
Figure 13−10−8
HYDRAULIC POWER
Description
Vol. 2 13−10−10
　
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