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The amber STANDBY HYD LOW QUANTITY light comes on
when the hydraulic fluid in the standby reservoir decreases to
less than 50 percent.
See the hydraulic indicating system section for more
information about the hydraulic fluid quantity indicating
system. (SECTION 29-30)
The amber STANDBY HYD LOW PRESSURE light comes on
when the pressure from the standby hydraulic system EMDP
decreases to less than normal during automatic or manual
operation of the EMDP.
See the hydraulic indicating system section for more
information about the hydraulic pump low pressure warning
system. (SECTION 29-30)
The amber STANDBY HYD STBY RUD ON light comes on
whenever the standby hydraulic system is turned on. The
standby hydraulic system is turned on when the FLT CONTROL
A or B switches are set to STBY RUD or when automatic
standby activation is commanded through either the auto
standby system or the main rudder PCU force fight monitor.
GUN ALL
STANDBY HYDRAULIC SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN ALL 29-22-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-003
STANDBY HYDRAULIC SYSTEM - CONTROLS AND INDICATIONS
STANDBY HYDRAULIC SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 29-22-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-003
STANDBY HYDRAULIC SYSTEM - CONTROLS AND INDICATIONS
STANDBY HYDRAULIC SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 29-22-00
Page 12
D633A101-GUN Jun 10/2006
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-003
Purpose
The standby hydraulic system reservoir supplies hydraulic fluid
under pressure to the standby hydraulic system EMDP. The
reservoir also receives the return hydraulic fluid from the
standby rudder power control unit and the B system reservoir
balance line.
Location
The standby hydraulic system reservoir is on the keel beam in
the main landing gear wheel well.
Physical Description
The standby hydraulic system reservoir is an airtight metal
shell that contains 3.6 gallons (13.3 liters) of hydraulic fluid.
The reservoir has these components and connections:
* Ground service line
* Fill and balance line
* EMDP supply line
* Low quantity switch.
The standby hydraulic system reservoir has no drain valve.
Functional Description
The ground service connection permits fluid servicing from the
ground servicing system to the standby and system B
reservoirs.
The fill and balance connection connects the standby reservoir
to the hydraulic system B reservoir. The fill and balance line
does these functions:
* Overfill from the servicing system to the system B reservoir
* Thermal expansion of the standby hydraulic system
reservoir
* Supply pressure from the hydraulic system B reservoir.
The EMDP supply line connection permits hydraulic fluid supply
to the pump, and purging of the reservoir.
The reservoir low quantity switch sends a signal to the amber
STANDBY HYD LOW QUANTITY light on the flight control panel
in the flight compartment when the fluid level in the reservoir is
less than 50 percent.
See the hydraulic indicating system section for more
information about hydraulic fluid quantity indicating system.
(SECTION 29-30)
Training Information Point
CAUTION: MAKE SURE THAT YOU PULL DOWN ON THE
KNURLED RING OF THE SELF-SEAL DISCONNECT
BEFORE YOU TURN IT FOR REMOVAL. IF YOU DO
NOT DO THIS, TOO MUCH TORQUE WILL BE
NECESSARY TO TURN THE RING WHICH WILL
DAMAGE THE SELF-SEAL DISCONNECT.
STANDBY HYDRAULIC SYSTEM - RESERVOIR
EFFECTIVITY
GUN ALL 29-22-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-004
The standby hydraulic system reservoir has a quick disconnect
at the bottom for the standby hydraulic system EMDP supply
line.
STANDBY HYDRAULIC SYSTEM - RESERVOIR
EFFECTIVITY
GUN ALL 29-22-00
Page 14
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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