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STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - PUMP
EFFECTIVITY
GUN ALL 29-22-00
Page 28
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-009
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - PUMP
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - PUMP
EFFECTIVITY
GUN ALL 29-22-00
Page 29
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-009
General
The standby rudder shutoff valve operates manually or
automatically. In the automatic mode, the standby hydraulic
system supplies enough control of the rudder during takeoff,
approach, and landing if either or both of the main systems fail.
The leading edge flaps and slats shutoff valve only operate
manually.
Standby Rudder Shutoff Valve
Manual operation of either FLT CONTROL switch to the STBY
RUD position sends 28v dc power to open the standby rudder
shutoff valve and control the FLT CONTROL LOW PRESSURE
light through the standby rudder valve position relay. When the
relay energizes, the ground for the FLT CONTROL LOW
PRESSURE lights is removed. If the valve does not open, the
respective FLT CONTROL LOW PRESSURE light stays on.
See the flight control multiple use systems/units section for
more information about the FLT CONTROL LOW PRESSURE
light. (SECTION 27-09)
See the flight control multiple use systems/units section for
more information about the standby rudder valve position relay.
(SECTION 27-09)
The standby rudder shutoff valve moves to the closed position
when both FLT CONTROL switches are moved to the OFF or ON
positions.
Automatic operation of the standby pump energizes the auto
standby system relay in the flight control panel. This sends 28v
dc power to open the standby rudder shutoff valve and control
the FLT CONTROL LOW PRESSURE light through the standby
rudder valve position relay.
The standby rudder shutoff valve closes when the standby
hydraulic system EMDP stops automatic operation.
Leading Edge Flaps And Slats Shutoff Valve
Move the ALTERNATE FLAPS arm switch to the ARM position
and the ALTERNATE FLAPS control switch the DOWN position.
This sends 28v dc power to operate the leading edge flaps and
slats shutoff valve to the open position and energize the K3 LE
standby drive shutoff valve relay.
When the K3 relay is energized, a signal goes to the R625
standby shutoff valve indication relay. This controls electrical
power from the TE flap landing warning switch to close the PTU
control valve in the main landing gear wheel well.
See the hydraulic power transfer unit system section for more
information about the standby shutoff valve indication relay.
(SECTION 29-25)
STANDBY HYDRAULIC SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL - VALVES
EFFECTIVITY
GUN ALL 29-22-00
Page 30
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-22-00-010
The LE standby drive shutoff valve relay has a hold circuit. The
hold circuit holds the relay in the energized position when the
ALTERNATE FLAPS control switch releases and moves to the
OFF position. The ALTERNATE FLAPS arm switch must be in
the ARM position.
The leading edge flaps and slats shutoff valve operates to the
closed position when the ALTERNATE FLAPS arm switch
moves to the OFF position. This de-energizes the LE standby
drive shutoff valve relay hold circuit. This also removes 28v dc
to the leading edge flaps and slats shutoff valve.
Training Information Point
During a system test of the standby hydraulic system, you
operate the standby hydraulic system and put the airplane in
the air mode.
Obey these warnings when you put the airplane in the air mode:
WARNING: MAKE SURE THE DOWNLOCK PINS ARE
INSTALLED ON ALL THE LANDING GEAR.
WITHOUT THE DOWNLOCK PINS, THE LANDING
GEAR COULD RETRACT AND CAUSE INJURIES
TO PERSONS AND DAMAGE TO EQUIPMENT.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT
ARE CLEAR OF RUDDER, THRUST REVERSERS,
AND LEADING EDGE SLATS BEFORE YOU
SUPPLY HYDRAULIC POWER. RUDDER, THRUST
REVERSERS, AND LEADING EDGE SLATS CAN
MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC
POWER. THIS CAN CAUSE INJURY TO PERSONS
AND DAMAGE TO EQUIPMENT.
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE
FLIGHT CONTROL SURFACES. THESE
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