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flap and slat actuators during alternate operation.
Location
The LE standby shutoff valve is on the standby system module
in the MLG wheel well.
Physical Description
The LE standby shutoff valve is a 28v dc motor with a twoposition
valve. The valve is usually in the closed position.
During the alternate operation of the LE flaps and slats, the LE
standby shutoff valve receives electrical power from the
alternate flaps switches. There is more information on the
alternate operation later in this section.
The LE standby shutoff valve has a red lever that shows the
position of the valve. You can move this lever to move the valve
manually. When you move the lever manually, install a lock to
prevent movement of the valve.
The LE standby shutoff valve is interchangeable with the
standby rudder shutoff valve.
Training Information Point
When you release pressure from the LE flap and slat
components, obey this warning:
WARNING: MAKE SURE TO INSTALL THE LOCK ASSEMBLY
ON THE LE STANDBY SHUTOFF VALVE TO
PREVENT THE ACCIDENTAL STANDBY SYSTEM
OPERATION OF THE LE FLAPS AND SLATS. THE
LE FLAPS AND SLATS CAN MOVE QUICKLY. THIS
CAN CAUSE INJURY TO PERSONS OR DAMAGE
TO EQUIPMENT.
LE FLAP AND SLAT CONTROL SYSTEM - LE STANDBY SHUTOFF VALVE
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - LE STANDBY SHUTOFF VALVE
LE FLAP AND SLAT CONTROL SYSTEM - LE STANDBY SHUTOFF VALVE
EFFECTIVITY
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27-81-00-007
Purpose
The LE flap actuators use hydraulic power to move the LE flaps.
Location
The LE flap actuators are on the leading edge of the wings. To
get access to the actuators, extend the LE flaps.
Physical Description
Each LE flap actuator weighs approximately 14 lbs (6.4 kg).
The LE flap actuators have two positions: retract and extend.
All the LE flap actuators are interchangeable.
Training Information Point
When you release pressure from the LE flap actuators, observe
this note:
NOTE: The LE flaps can slowly extend because of gravity.
You can install locks on the LE flap actuators. When you do
maintenance in the area around the LE flaps, obey this warning:
WARNING: MAKE SURE TO INSTALL THE LE FLAP LOCKS TO
PREVENT ACCIDENTAL OPERATION OF THE LE
FLAPS. THE LE FLAPS CAN MOVE QUICKLY. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO EQUIPMENT.
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAP ACTUATORS
EFFECTIVITY
GUN ALL 27-81-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-008
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAP ACTUATORS
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAP ACTUATORS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-008
General
The LE flap actuators use hydraulic power. Hydraulic system B
or the standby hydraulic system move the LE flaps.
During the normal operation, the LE flap actuators use hydraulic
power from system B. The LE flap actuators receive extend
pressure from the LE flap and slat control valve. The LE flap
actuators receive retract pressure from the LE UCM shutoff
valve.
During the alternate operation, the LE flap actuators use
hydraulic power from the standby system to extend the LE flaps.
The LE flaps do not retract during the alternate operation.
The LE flap actuators have two positions: retract and extend.
Functional Description
Each LE flap actuator has these components:
* Piston
* Two blocking valves
* Two restrictors.
During extension in the normal operation, the actuator receives
retract pressure from hydraulic system B and extend pressure
from the LE flap and slat control valve. This causes the system
blocking valve to open, which permits pressure to both sides of
the piston.
The actuator is a differential area piston. When the pressure is
the same on both sides of the piston, the piston extends. The
restrictors help the piston move smoothly.
During retraction in the normal operation, the actuator receives
　
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