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LE FLAP AND SLAT CONTROL SYSTEM - LE FLAPS AND LE SLATS
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
Normal Operation
During the normal operation, use the flap lever to operate the
LE flaps and slats. The normal operation requires system B
hydraulic power.
The LE flaps move to two positions and the LE slats move to
three positions. The LE devices annunciator panel in the flight
compartment shows the position of the LE flaps and slats. The
LE FLAPS TRANSIT light and the LE FLAPS EXT light show the
condition of the LE flaps and slats.
During the normal operation of the LE flaps and slats, the TE
flaps move.
During cruise, the LE cruise depressurization function prevents
extension of the LE flaps and slats. This function operates when
all the LE devices and the flap lever are at the up position and
the airplane is in the air.
If two or more LE devices move away from their commanded
position, the LE UCM detection function stops the LE normal
operation.
If the airplane comes near a stall condition, the autoslat function
causes the LE slats to move from the extend position to the full
extend position. If this function is not available, the AUTOSLAT
FAIL light shows on the flight controls panel.
See the leading edge autoslat system section for more
information on the autoslat function. (SECTION 27-83)
See the trailing edge flap system section for more information
on the TE flap system. (SECTION 27-51)
Alternate Operation
During the alternate operation, use the alternate flaps switches
to extend the LE flaps and slats. The alternate operation uses
standby hydraulic power instead of system B hydraulic power.
First, move the alternate flaps arm switch to the arm position.
This starts the standby hydraulic pump and opens the LE flap
standby shutoff valve. Then move the alternate flaps control
switch to the down position. This permits the LE flaps to move to
the extend position and the LE slats to move to the full extend
position.
During the alternate operation, the LE flaps and slats can not
retract. To retract the LE flaps and slat, you must use the normal
operation.
During the alternate operation, the LE cruise depressurization
function, LE UCM detection function, and autoslat function are
not available.
LE FLAP AND SLAT CONTROL SYSTEM - OPERATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-015
Operating Times
The table below describes the time it takes (in seconds) for the
LE flaps and slats to move in the normal and alternate
operation. The times are for normal operating loads. There are
small differences in the times for no operating loads.
Operating condition LE flaps LE slats
Normal - up to extend 7 sec 8 sec
Normal - extend to full extend N/A 3.0 sec
Normal - full extend to extend N/A 4.8 sec
Normal - extend to up 7.5 sec 7.8 sec
Alternate - up to full extend 32 sec 58 sec
Training Information Point
To do a check of the LE devices and TE flaps operation times
with a hydraulic ground cart, make sure 20 gpm is available.
LE FLAP AND SLAT CONTROL SYSTEM - OPERATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-015
LE FLAP AND SLAT CONTROL SYSTEM - OPERATION
LE FLAP AND SLAT CONTROL SYSTEM - OPERATION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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LE FLAP AND SLAT CONTROL SYSTEM - OPERATION
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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
General
These are the LE flap and slat hydraulic components that are
LRUs:
* Flow limiting valve
* Hydraulic fuses
* LE cruise depressurization valve
* LE UCM shutoff valve
* LE flap and slat control valve
* LE flap actuators
* LE slat actuators.
Normal Operation
During the normal operation, the LE flap and slat actuators use
　
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