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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-018
Purpose
The LE cruise depressurization valve prevents LE flap and slat
extension during cruise.
Functional Description
The flap lever position switch that operates when the flap lever
is up provides power for the LE cruise depressurization valve
solenoid. The FSEU provides a ground for the solenoid.
The FSEU gets the inputs from these components for operation
of the LE cruise depressurization valve:
* LE flap and slat proximity sensors
* Flap lever position sensor
* Alternate flaps ARM switch
* PSEU for air/ground information.
The FSEU sends a signal to close the LE cruise
depressurization valve closes when all of these conditions
occur for five seconds:
* Flap lever at up
* All LE flaps retracted
* At least 7 LE slats retracted.
The LE cruise depressurization valve does not operate if any of
these conditions occur:
* Flap lever not up
* Alternate flaps arm switch is in the ARM position
* Airplane is on the ground.
You can use the FSEU BITE to send a command to operate the
LE cruise depressurization valve.
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE CRUISE DEPRESSURIZATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-021
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE CRUISE DEPRESSURIZATION
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE CRUISE DEPRESSURIZATION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-021
Purpose
The LE UCM shutoff valve prevents LE flap and slat movement if
two or more LE flaps or three or more LE slats move away from
their commanded position.
Location
The LE UCM shutoff valve is in the right wing-to-body fairing,
forward of the main landing gear wheel well. To get access,
open the ram air inlet duct access panel.
Physical Description
The LE UCM shutoff valve has a 28v dc solenoid-operated valve
and a pressure-operated valve.
The LE UCM shutoff valve is identical and interchangeable with
the LE cruise depressurization valve.
Functional Description
The LE UCM shutoff valve is normally open. This permits
hydraulic system B pressure to the retract lines of the LE flap
and slat actuators.
The LE uncommanded motion (UCM) detection function in the
FSEU controls the solenoid operated valve in the LE UCM
shutoff valve.
When the FSEU sends a signal to energize the solenoid
operated valve, it moves and sends pressure to move the
pressure operated valve.
This stops the hydraulic system B pressure to the retract lines
of the LE flap and slat actuators. When retract pressure is
removed, a system blocking valve in the LE flap and slat
actuators moves to the closed position. This prevents
movement of the LE flaps and slats by creating a hydraulic
lock on the actuator.
Training Information Point
The manual override lever on the LE UCM shutoff valve is not
used.
LE FLAP AND SLAT CONTROL SYSTEM - LE UCM SHUTOFF VALVE
EFFECTIVITY
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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
27-81-00-020
LE FLAP AND SLAT CONTROL SYSTEM - LE UCM SHUTOFF VALVE
LE FLAP AND SLAT CONTROL SYSTEM - LE UCM SHUTOFF VALVE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-020
THIS PAGE IS INTENTIONALLY LEFT BLANK
LE FLAP AND SLAT CONTROL SYSTEM - LE UCM SHUTOFF VALVE
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
Purpose
The LE UCM shutoff valve prevents LE flap and slat movement if
two or more LE flaps or three or more LE slats move away from
their commanded position.
Functional Description
The FSEU gets inputs from these components for operation of
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