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* Standby rudder shutoff valve
* Leading edge flaps and slats shutoff valve
* EMDP
* Standby hydraulic LOW QUANTITY light
* Standby hydraulic LOW PRESSURE light.
GUN ALL
Reservoir
The standby hydraulic system reservoir supplies hydraulic fluid
to the EMDP. The reservoir also gets the return hydraulic fluid.
Electric Motor-Driven Pump
The EMDP has an electric motor that mechanically connects to
a hydraulic pump. The EMDP is the only source of hydraulic
pressure in the standby hydraulic system.
Standby Hydraulic System Module
The standby hydraulic system module does these functions:
* Cleans the pressure fluid from the standby EMDP
STANDBY HYDRAULIC SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-22-00
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29-22-00-002
* Controls pressure to the leading edge flaps and slats
* Controls pressure to the standby rudder power control unit
(PCU)
* Supplies metered pressure to the thrust reversers
* Monitors system pressure
* Protects system from over pressure.
Case Drain Filter Module
The case drain filter module cleans the case drain fluid that
comes from the EMDP.
STANDBY HYDRAULIC SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-22-00
Page 6
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-002
STANDBY HYDRAULIC SYSTEM - GENERAL DESCRIPTION
STANDBY HYDRAULIC SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 29-22-00
Page 7
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-002
STANDBY HYDRAULIC SYSTEM - GENERAL DESCRIPTION
STANDBY HYDRAULIC SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 29-22-00
Page 8
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-002
General
The controls and indications for the standby hydraulic system
are on the flight control panel. The flight control panel is on the
P5 forward overhead panel in the flight compartment.
Controls
These switches operate components in the standby hydraulic
system:
* FLT CONTROL A and B switches
* ALTERNATE FLAPS arm switch
* ALTERNATE FLAPS control switch.
Move one of the two FLT CONTROL A or B switches to the STBY
RUD position to start the standby hydraulic system EMDP and
open the standby rudder shutoff valve in the standby system
module.
Move the ALTERNATE FLAPS arm switch to the ARM position to
start the standby hydraulic system EMDP.
Move the ALTERNATE FLAPS control switch to the down
position momentarily to open the leading edge flaps and slats
shutoff valve in the standby system module.
GUN 001-005, 201-999 PRE SB 737-27-1253
Indications
These are the two caution indications on the flight control panel
for the standby hydraulic system:
* STANDBY HYD LOW QUANTITY light
* STANDBY HYD LOW PRESSURE light.
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)
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
GUN 001-005, 201-999 PRE SB 737-27-1253 (Continued)
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
737-27-1253
Indications
These are the two caution indications on the flight control panel
for the standby hydraulic system:
* STANDBY HYD LOW QUANTITY light
* STANDBY HYD LOW PRESSURE light.
* STANDBY HYD STBY RUD ON light.
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