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The filter manifold for system 3 is located on the left side of the aft equipment bay and contains all the features of system 1 and 2. An additional feature is that the RAT pump shares a common pressure switch with ACMP 3B.
Fluid quantity and temperature transducers are located on the reservoir and are indicated on the HYDRAULIC synoptic page.
Two pressure switches and a transducer are part of the pressure manifold and are used to provide EICAS displays for pump failures and loss of system pressure.
Ground Service Panel
The ground service panel for system 3 is located at the left side of the fuselage, aft of the wing trailing edge.
GF1310_016a
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
HYDRAULIC SYSTEM 3 (CONT'D)
RAT and System 3 Accumulators
DIRECT
READING
GAUGE
SYSTEM 3 RAT ACCUMULATOR
SYSTEM 3 BRAKE ACCUMULATOR
A RAT accumulator is used to maintain pressure to the reservoir when 3A and 3B ACMPs are 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.
GF1310_017
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
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 3A
Controls the operation of the
pump in the following conditions:
ON . When the correct
ON . When the correct electrical logic
electrical logic is set the pump is set the pump will operate at normal
will operate at normal operating operating pressure.
pressure.
OFF. Pump is inoperative.
OFF . Pump is inoperative.
AUTO . 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 Pumps
System pressure is normally maintained by pump 3A which runs continuously in the ON mode. The back-up 3B pump is normally operated in the AUTO mode and comes on automatically during take-off, approach and landing or in support of a 3A primary pump failure.
The AC-motor 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.
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