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retract pressure only. This opens the system blocking valve,
which sends pressure to the retract side of the piston. This
causes the piston to retract.
If the hydraulic system B pressure is less than 2000 psi, the
blocking valves hydraulically lock the piston. This prevents
piston movement during hydraulic system failures.
During the alternate operation, the standby hydraulic system
supplies extend pressure to the LE flap actuators. This causes
both blocking valves to move. This stops the hydraulic power
from the system B to the piston. Instead, both sides of the piston
receives hydraulic power from the standby system. This causes
the piston to extend.
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAP ACTUATORS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - LE FLAP ACTUATORS - FUNCTIONAL DESCRIPTION
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAP ACTUATORS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The LE slat actuators use hydraulic power to move the LE slats.
Location
The LE slat actuators are on the leading edge of the wings. To
get access to the actuators, extend the LE slats and remove the
access panels under the wing.
Physical Description
Each LE slat actuator weighs approximately 20 lbs (9.1 kg).
The LE slat actuators have three positions:
* Retract
* Extend
* Full extend.
All the LE slat actuators are interchangeable.
Training Information Point
You can install locks on the LE slat actuators. When you do
maintenance in the area around the LE slats, obey this warning:
WARNING: MAKE SURE TO INSTALL THE LE SLAT LOCKS TO
PREVENT ACCIDENTAL OPERATION OF THE LE
SLATS. THE LE SLATS CAN MOVE QUICKLY. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE
TO EQUIPMENT.
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS
EFFECTIVITY
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27-81-00-010
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS
LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - LE SLAT ACTUATORS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The LE slat actuators use hydraulic power from either the
hydraulic system B or the standby hydraulic system to move the
LE slats.
During the normal operation, hydraulic system B supplies
hydraulic power to the LE slat actuators. The LE flap and slat
control valve supplies extend pressure to the LE slat actuators.
Hydraulic system B supplies retract pressure to the LE slat
actuators.
During the alternate operation, the standby system supplies
hydraulic power to the LE slat actuators to fully extend the LE
slats. The LE slats do not retract during the alternate operation.
The LE slat actuators have three positions:
* Retract
* Extend
* Full extend.
Functional Description
Each LE slat actuator has these components:
* Inner piston
* Outer piston
* Blocking valves
* Restrictors
* Relief valve
* Lock piston
* Lock stud
* Lock segment.
During the normal operation, hydraulic system B supplies
hydraulic pressure to the actuator. This causes the system
blocking valve to open, which permits pressure to go to the
retract side of the inner and outer pistons. This causes the
actuator to retract. When the actuator fully retracts, the lock
segments rotate to the position shown in the graphic. Because
the lock stud does not move, the lock segments prevent
extension of the inner piston.
The LE flap and slat control valve supplies extend pressure to
the actuator to move the actuator to the extend position. This
causes pressure to go through the lock stud to the lock piston.
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