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system B reservoir. The system B reservoir can supply fluid
and pressurization to the standby reservoir.
The ground servicing system lets you add fluid to the standby
reservoir. This also adds fluid to the system B reservoir through
the fill and balance line.
Pressurization
The EMDP supplies pressure to the standby hydraulic system.
The EMDP can operate either manually or automatically.
A pump low pressure switch sends a signal to a flight
compartment STANDBY HYD LOW PRESSURE light. This
occurs when the EMDP pressure decreases to less than
normal.
Distribution
The pressurized fluid from the EMDP goes to the standby
hydraulic system module. The standby hydraulic system
module cleans, monitors, and distributes the pressurized fluid.
The leading edge flap and slat shutoff valve controls pressure to
the leading edge flaps and slats.
The standby rudder shutoff valve controls pressure to the
standby rudder power control unit.
A volume fuse in the standby system pressure line to the
leading edge flaps and slats closes when hydraulic fluid flow
increases to 270-350 cubic inches. A flow limiting valve
downstream of the volume fuse limits the standby hydraulic
fluid flow to 2.1 gallons per minute.
See the leading edge flaps and slat control system for more
information about the flow limiting valve and hydraulic fuses.
(SECTION 27-81)
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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A check valve in the standby pressure line upstream of the left
thrust reverser shuttle valve prevents transfer of system A fluid
into system B.
Volume fuses in the standby system pressure lines to the thrust
reversers close when hydraulic fluid flow increase to 175 cubic
inches. This prevents hydraulic fluid loss if there is a leak in the
system.
See the thrust reverser control system for more information
about the volumetric hydraulic fuses. (SECTION 78-34)
Shuttle valves make a selection between system A and B
pressure or standby pressure, to supply the thrust reversers.
Filtration
A pressure filter in the standby hydraulic system module cleans
the pressure flow to the EMDP.
A case drain filter module cleans the case drain flow from the
EMDP.
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-008
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-008
General
You operate the standby system hydraulic electric motor-driven
pump (EMDP) manually with one of these switches on the flight
control panel:
* FLT CONTROL A switch to STBY RUD
* FLT CONTROL B switch to STBY RUD
* ALTERNATE FLAPS arm switch to ARM.
The standby pump operates automatically if all of these
conditions are true:
* Either FLT CONTROL A or B switch to ON
* ALTERNATE FLAPS arm switch to OFF
* Trailing edge flaps not up
* Airplane in the air or wheel speed more than 60 kts
* Low flight control pressure.
Manual Functional Description
Either FLT CONTROL switch to STBY RUD sends 28v dc to
energize these components:
* The standby hydraulic pump relay. When the relay is
energized, 115v ac goes through the relay contacts and
turns on the standby hydraulic system EMDP.
* The standby rudder shutoff valve. When the valve opens,
hydraulic pressure from the standby hydraulic system EMDP
goes to the standby rudder power control unit (PCU). Also,
electrical power goes to the valve position relay.
See the flight controls multiple use systems/units section for
more information about the valve position relay.
(SECTION 27-09)
The ALTERNATE FLAPS arm switch to the ARM position
energizes only the standby hydraulic pump relay. This turns on
the standby hydraulic pump.
Automatic Functional Description
When all the conditions for automatic operation are correct, the
auto standby system relay energizes. This lets 28v dc energize
the same components as the manual function of operation.
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