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PTU was operating, it stops.
The standby EMDP supplies hydraulic pressure to the LE
standby shutoff valve. The standby shutoff valve supplies
pressure to the LE flap and slat actuators, and these
actuators extend. The LE flaps move to the extend position
and the LE slats move to the full extend position.
It takes approximately 32 seconds for the LE flaps and 58
seconds for the LE slats to fully extend in the alternate
operation.
The LE standby shutoff valve relay latches. When the alternate
flaps control switch moves to the off position, the relay stays
energized. This relay de-energizes when the alternate flaps
arm switch moves to the off position. When you move the
alternate flaps arm switch to the off position, the standby EMDP
stops and the LE standby shutoff valve closes.
When you move the alternate flaps arm switch to the off
position, the alternate operation stops. This permits the normal
operation. If hydraulic system B has pressure, then the LE flaps
and slats retract.
Retract
During the alternate operation, the LE flaps and slats can not
retract. You must use the normal operation to retract the
surfaces.
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - ALTERNATE OPERATION
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - ALTERNATE OPERATION
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - ALTERNATE OPERATION
EFFECTIVITY
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27-83-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The LE autoslat system moves the LE slats from the extend
position to the full extend position when the airplane gets near a
stall condition. This helps improve the airplane performance.
Interfaces
Two stall management yaw damper (SMYD) computers
calculate the autoslat commands. Each SMYD sends an
autoslat signal to the autoslat control valve. The autoslat
control valve sends hydraulic power from hydraulic system B or
the PTU system to the LE slat actuators. This causes the LE
slats to fully extend.
If the autoslat function is not available, the autoslat fail light
shows on the flight controls panel on the P5 overhead panel.
See SMYD section 27-32 for more information. (SECTION 27-32)
LE AUTOSLAT SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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LE AUTOSLAT SYSTEM - GENERAL DESCRIPTION
LE AUTOSLAT SYSTEM - GENERAL DESCRIPTION
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Purpose
The autoslat control valve causes the LE slats to move from
extend to full extend if the airplane gets near a stall condition.
This valve supplies pressure to the full extend port on the LE
slat actuators.
Location
The autoslat control valve is on the right side of the fuselage,
just forward of the MLG wheel well. Remove the access panel to
get access.
Physical Description
The autoslat control valve has two solenoid valves and two
valves that operate by pressure. The solenoids are line
replaceable units (LRUs).
Functional Description
The autoslat control valve sends full extend pressure to the LE
slat actuators during the normal operation or during the
autoslat operation.
Normal Operation
During the normal operation, when the flap lever is at 10 or
more, the LE flap/slat control valve sends full extend pressure
to the autoslat control valve. This pressure goes through both
valves that operate by pressure. Then the pressure goes to the
full extend port on the LE slat actuators.
Autoslat Operation
The autoslat operation occurs when all of these conditions
occur:
* Flap lever at 1, 2 or 5
* Airplane gets near a stall condition
* Alternate operation is not active.
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