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The lock piston extends and releases the lock segments. This
permits the inner piston to move.
Pressure also goes around the lock stud to the extend side of
the inner piston. Because the inner piston is a differential area
piston, the piston extends. The restrictors help the piston move
smoothly.
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The LE flap and slat control valve supplies full extend pressure
to the actuator to move the actuator to the full extend position.
This pressure goes through the system blocking valve to the
extend side of the outer piston. Because the outer piston is also
a differential area piston, the piston extends. As this occurs, the
inner piston stays in the extend position. This causes the
actuator to move to its full extend position.
During retraction in the normal operation, the LE flap and slat
control valve stops the full extend pressure first. This causes
the outer piston to retract first. Then, the LE flap and slat control
valve stops the extend pressure. This causes the inner piston to
retract. Springs cause the lock piston to retract, and this
engages the lock segments.
If the hydraulic system B pressure is less than 2000 psi, the
blocking valves close and hydraulically lock the pistons. This
prevents the piston movement during hydraulic system failures.
During the alternate operation, the standby hydraulic system
supplies full extend pressure to the LE slat actuators. This
causes the standby blocking valve to open and the system
blocking valve to close. This stops the hydraulic power from the
system B to the pistons. Instead, standby hydraulic pressure
goes to the extend side of all the pistons. This causes the
pistons to extend and the actuator moves to the full extend
position.
Training Information Point
Look through the indicator inspection hole to see if the actuator
unlocks. If you can see through the hole, the actuator is locked.
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 38
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-011
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS - FUNCTIONAL DESCRIPTION
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-81-00
Page 39
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-011
General
The LE slat actuators have three positions:
* Retract
* Extend
* Full extend.
Retract
When the hydraulic system B pressurizes, both the inner and
outer pistons retract.
Extend
When the LE slat actuator receives extend pressure, the lock
piston extends and the inner piston extends.
Full Extend
When the LE slat actuator receives full extend pressure, the
outer piston extends.
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATOR POSITIONS
EFFECTIVITY
GUN ALL 27-81-00
Page 40
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-012
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATOR POSITIONS
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATOR POSITIONS
EFFECTIVITY
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Page 41
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-012
Purpose
The main and auxiliary tracks help hold the LE slats in three
positions. These tracks cause the LE slats to move to the correct
positions when the LE slat actuators move.
Location
The tracks attach to the LE slats. To get access to the tracks,
extend the LE slats and remove the access panels under the
wing.
Main Track
There are two main tracks for each LE slat.
The main track moves between two pairs of rollers. The main
track has an adjustable downstop that limits the full extend
position of the LE slat.
Auxiliary Track
There are two auxiliary tracks for each LE slat.
The auxiliary track interfaces with the following parts:
　
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