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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 precharge condition of the accumulator. Normal
precharge pressure of the brake accumulator equals 500 psi. Refer to the LANDING GEAR
Chapter 15 for more information on the brake control system.
HYDRAULICS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
13−10−15
HYDRAULIC CONTROL PANEL (3A/3B SWITCHES)
The HYDRAULIC control panel located on the overhead panel in the flight compartment contains the
ACMPs switches for hydraulic systems 3A and 3B.
Hydraulic 3A and 3B Pump Switches
AC−motor Pump 3B
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.
− Pump is in automatic/standby
mode. The pump will energize if the
ACMP 3A pump fails in flight or when the
correct logic is set with slats/flaps not at 0
degree position.
AC−motor Pump 3A
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.
GF1310_018
ON
OFF
AUTO
ON
OFF
HYDRAULIC
ON
OFF
AUTO
ON
OFF
ON
OFF
AUTO
ON
OFF
AUTO
1B 3A 3B 2B
ACMotor
Pumps
System pressure is normally maintained by pump 3A which runs continuously in the ON mode.
The backup
3B pump is normally operated in the AUTO mode and comes on automatically during
takeoff,
approach and landing or in support of a 3A primary pump failure.
The ACmotor
pumps 3A and 3B are powered from AC bus 4 and AC bus 1 respectively. The
pumps are controlled by separate toggle switches on the flight compartment HYDRAULIC control
panel. Refer to External and APU Electrical Pump Operation in this Chapter for external/APU
ground electrical services.
Manual Mode
Manual mode is accomplished by placing the respective ACMP control switch into either the “OFF”
or “ON” position. Hydraulic pumps 3A and 3B will run when selected to “ON” and their respective
bus is powered. In the “OFF” position each pump is inoperative for all operating conditions.
HYDRAULICS
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
13−10−16
HYDRAULIC CONTROL PANEL (3A/3B SWITCHES) (CONT'D)
Auto Mode
When 3B pump switch is set to “AUTO” the pump starts automatically under one of the following
conditions:
· When the correct electrical logic is determined by the alternating current power centre or
ACPC, either slats or flaps are not at the zero degree position and at least one VFG
operating.
· When the primary pump 3A falls below normal system pressure (£ 1800 psi) in flight.
Ground Operation Inhibits
When the APU is the airplane single source of electrical power, only one ACMP is allowed to run
at a time to prevent overloading the APU generator.
Start inhibit is provided for 3B “AUTO” mode of operation (no engine running), to enhance system
safety during normal maintenance operations. On ground, the 3B pump requires at least one
engine to be operating for normal operations with “AUTO” mode selected.
The 3B pump will not come on automatically (“AUTO” mode selected and flap less than zero
degrees), in support of a 3A pump failure on the ground.
Flight Operation
The normal pump switch configuration for in flight hydraulic system 3 operation is 3A pump switch
in the “ON” position and 3B in the “AUTO” mode of operation.
The 3B pump will come on automatically (“AUTO” mode selected) in support of a 3A pump failure
in flight. When the 3B pump is commanded on due to a low pressure condition of the primary
pump, it will remain on for a minimum of 5 minutes (including touchdown) unless “ON” or “OFF” is
selected. This is required to prevent ACMP overheating due to continuous restarts if the low
pressure alternates above and below 1800 psi.
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