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1A) and system 2 main pump is engine-driven pump 2A (EDP 2A). EDP 1A and 2A operate
anytime their respective engine is running.
Backup Pumps
Backup pumps for systems 1 and 2 are AC motor pumps (ACMP 1B and 2B). The operation of
ACMP 1B and 2B depends on engine-driven generator output, hydraulic pump switch position,
WOW, and the flap position. Pumps 1B and 2B are controlled by their respective three-position
toggle switches on the HYDRAULIC panel, labeled AUTO, ON and OFF.
AUTO Position
With the switches in the AUTO position, the 1B and 2B pumps automatically start when their
respective bus is powered, the associated 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.
Example (see Figure 13−10−2): When the 1B switch is set to AUTO, the pump will
automatically start with its bus powered (AC BUS 2) when:
• The opposite engine-driven generator (GEN 2) is operating, and
• Flap position not at zero (greater than 4°).
NOTE
ACMP 1B and 2B do not automatically start after an engine failure
or an EDP failure.
HYDRAULIC POWER
Description
Vol. 2 13−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
SYSTEMS 1 AND 2 (CONT'D)
Hydraulic System 1 − Shown In-flight with Flaps Extended
Figure 13−10−2
Hydraulic System 2 − Shown In-flight with Flaps Extended
Figure 13−10−3
HYDRAULIC POWER
Description
Vol. 2 13−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
SYSTEMS 1 AND 2 (CONT'D)
ON Position
With the switches in the ON position, ACMP 1B and 2B will operate, provided their respective
bus is powered and the associated cross−side engine−driven generator is operating. On the
ground, an interlock circuit allows the pumps to operate when the ACMP switch is selected
ON, even if the engine−driven generators are not operating (see Figure 13−10−2 and
Figure 13−10−3).
Generator Output and Load Shedding
During normal operations, ACMP 1B operation is controlled by the electrical output of GEN 2,
and ACMP 2B operation is controlled by the electrical output of GEN 1. In the event of an
in-flight engine-driven generator malfunction or an engine failure, the control logic inhibits any
operation of the opposite side ACMP. This function is called “load shedding”, and prevents an
electrical overload condition during single-generator operation. The cross-side generator
relationship with ACMP 1B and 2B ensures that a loss of system 1 and 2 pressure does not
occur with any one of the above failures.
Hydraulic Shutoff Valves
Electrically operated hydraulic shutoff valves are installed in the suction lines of EDP 1A and 2A.
Valve positions are indicated on the EICAS Hydraulic synoptic page. The valves are normally
open. During an engine fire, the corresponding hydraulic shutoff valve is motored closed by
pressing in the ENG FIRE PUSH switch/light (see Chapter 9, Fire Protection).
Accumulator and Reservoirs
Each system has an accumulator that stores nominal hydraulic pressure to satisfy
instantaneous demands of aircraft systems, and to dampen pressure surges within the system.
Each accumulator is precharged with nitrogen to 1,500 psi.
System 1 and 2 reservoirs are hydraulic fluid storage tanks. Each reservoir is a sealed unit, and
is filled via the ground service panel, located directly below the hydraulic equipment rack in the
aft equipment bay. System 1 reservoir has a capacity of 2.95 liters (0.78 U.S. gal.) System 2
reservoir has a capacity of 3.93 liters (1.04 U.S. gal.).
During preflight, a visual inspection should include checks for fluid leaks and accumulator
pressure at 1,500 psi. As well, reservoir quantity, overflow containers and filter bypass indicators
should be checked (see Figure 13−10−4).
CAUTION
Hydraulic systems are serviced with Skydrol-B, a fire-retardant
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.
HYDRAULIC POWER
Description
Vol. 2 13−10−4
REV 67, Mar 19/07
CL−604 Operating Manual
PSP 604−6
SYSTEMS 1 AND 2 (CONT'D)
Hydraulic System 2 Equipment Rack
Figure 13−10−4
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
　
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