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the LE UCM shutoff valve:
* LE flap and slats proximity sensors
* Flap lever position sensor
* Alternate flaps arm switch
* ADIRU for airspeed data
* SMYDs for autoslat command data
* TE flap skew sensors 1 and 8.
The LE UCM shutoff valve is normally open. This lets hydraulic
system B pressure go to the retract lines of the LE flap and slat
actuators.
The LE uncommanded motion (UCM) detection function in the
FSEU controls the LE UCM shutoff valve. This valve closes
when all the LE flaps and slats move to their commanded
position and then these conditions occur:
* Two or more LE flaps or three or more LE slats move away
from the flap lever position
* Flap lever is in a detent.
This stops the hydraulic system B pressure to the retract lines
of the LE flap and slat actuators. This prevents movement of the
LE flaps and slats.
The SMYDs send a signal to the FSEU when an autoslat function
is commanded. The FSEU uses this information to change the
LE slat commanded position from extend to full extend.
The FSEU sends a signal to the SMYD 1 and SMYD 2 when an
LE uncommanded motion is detected. The SMYDs use this
information to apply a bias to the trip point for the stall warning
system.
The FSEU also sends a takeoff warning signal to the PSEU
when an LE uncommanded motion is detected.
The LE UCM detection function is not available when these
conditions occur:
* Airplane speed is less than 60 knots
* Alternate flaps arm switch is at ARM
If an uncommanded motion (UCM) occurs, you must cycle the
power to the FSEU on the ground to permit normal operation
again.
The SET OUTPUTS? function of the FSEU BITE lets you send a
signal to operate the LE UCM shutoff valve.
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE UCM DETECTION
EFFECTIVITY
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Indication
If a LE UCM occurs, the LE FLAPS TRANSIT light on the P2
panel comes on.
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE UCM DETECTION
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE UCM DETECTION
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - LE UCM DETECTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-022
Purpose
The LE flow limiting valve and the hydraulic fuses control the
flow of hydraulic fluid to the LE flap and slat hydraulic
components. The LE flow limiting valve limits the speed of
movement of the LE flaps and slats. Three hydraulic fuses stop
the flow of hydraulic fluid if there is a leak. These are the three
hydraulic fuses:
* LE extend hydraulic fuse
* LE retract hydraulic fuse
* LE standby hydraulic fuse.
Location
The flow limiting valve and the LE standby hydraulic fuse are on
the keel beam in the MLG wheel well. The LE extend and retract
hydraulic fuses are on the ceiling in the MLG wheel well, near
the flap control unit.
Physical Description
The LE flow limiting valve limits the standby hydraulic fluid flow
to 2.1 gallons per minute.
The LE extend and retract hydraulic fuses stop the hydraulic
flow when the volume of fluid through it is more than 180 - 250
cubic inches. The LE standby hydraulic fuse stops the hydraulic
flow when the volume of fluid through it is more than 270 - 350
cubic inches.
LE FLAP AND SLAT CONTROL SYSTEM - FLOW LIMITING VALVE AND HYDRAULIC FUSES
EFFECTIVITY
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27-81-00-006
LE FLAP AND SLAT CONTROL SYSTEM - FLOW LIMITING VALVE AND HYDRAULIC FUSES
LE FLAP AND SLAT CONTROL SYSTEM - FLOW LIMITING VALVE AND HYDRAULIC FUSES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-006
Purpose
The LE standby shutoff valve supplies hydraulic power to the LE
　
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