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Heat Exchanger
System 1 heat exchanger is positioned within the left fuel feed tank and system 2 in the right. The purpose of each exchanger is to cool the case drain fluid (lubrication fluid within each pump), prior to returning it to the reservoir.
SYSTEM 2 HEAT
EXCHANGER HEAT EXCHANGER
SYSTEM 1 HEAT EXCHANGER
GF1310_009a
If the fluid temperature is sufficiently cooled, a bypass of the exchanger will allow the fluid to go directly to the reservoir. Fuel in the wing feed tank is the cooling medium.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2 CSP 700.5000.6 13.10.7
HYDRAULIC SHUTOFF VALVE CONTROL PANEL (CONT'D)
System 2 Accumulator
The brake control system uses an accumulator from hydraulic system 2 for brake operations.
DIRECT READING GAUGESYSTEM 2 BRAKE ACCUMULATOR
There is a direct reading gauge to check the precharge condition of the accumulator. Refer to the LANDING GEAR Chapter for more information on the brake control system.
Ground Service Panel
The ground service panel for systems 1 and 2 is located in the aft equipment bay.
GF1310_010
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
HYDRAULIC CONTROL PANEL (1B/2B SWITCHES)
The HYDRAULIC control panel is located on the overhead panel in the flight compartment and contains the ACMPs switches for hydraulic systems 1 and 2.
Hydraulic 1B and 2B Pump Switches
Controls the operation of each pump in the following conditions
ON . When the correct electrical logic is set the applicable pump will operate at normal operating pressure.
OFF. Pump is inoperative.
AUTO . Pump is in automatic/standby mode. Each pump will energize when its system primary pump fails in flight or when the correct logic is set with slats/flaps not at zero degree position
Manual Mode
Manual mode is accomplished by placing the respective ACMP control switch into either the “OFF” or “ON”position. Hydraulic pumps 1B and 2B will run when selected to “ON”and their respective bus is powered. In the “OFF”position each pump is inoperative for all operating conditions.
Auto Mode
When the pump switch is set to “AUTO”the respective pump automatically starts under one of the following conditions:
.
When the correct electrical logic is determined by the Alternating Current Power Center (ACPC), either slats or flaps are not at the zero degree position and at least one Variable Frequency Generator (VFG) operating.
.
When the primary pump falls below normal system pressure (≤ 1800 psi) in flight.
Ground Operation Inhibits
On ground with the APU as the single source of electrical power, only one ACMP is allowed to operate.
Start inhibit is provided for 1B and 2B “AUTO”mode of operation (no engines running), to enhance system safety during normal maintenance operations. For normal operation on the ground, the applicable system 1 or 2 ACMP requires at least one engine to be operating, with “AUTO”mode selected.
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