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power from hydraulic system B. The flap priority valve reduces
the flow of hydraulic fluid to the TE flap components if the
system B pressure is low. This gives priority of system B
hydraulic power to the LE flaps and slats over the TE flaps.
Hydraulic system B power goes through the LE UCM shutoff
valve to the retract port of all the LE flap and slat actuators. If the
LE flap and slat control valve is in the retract position, the LE
flap and slat actuators retract.
The LE flap and slat control valve uses mechanical inputs from
the TE flap PDU follow-up cables. These cables move when the
TE flaps move. When you move the flap lever to the 1, 2, or 5
positions, movement of the TE flaps causes the cables to move.
This causes the cables to move the LE flap and slat control
valve to the extend position.
Hydraulic pressure goes through the LE cruise
depressurization valve to the LE flap and slat control valve.
The LE flap and slat control valve sends extend pressure to the
LE flap and slat actuators. This causes the LE flaps and slats to
move to the extend position.
When you move the flap lever to the 30 position, the TE flap PDU
follow-up cables move the LE flap and slat control valve to the
full extend position.The LE flap and slat control valve sends full
extend pressure through the autoslat valve to the LE slat
actuators only. This causes the LE slats to move to the full
extend position.
When the airplane is in a cruise condition, the LE cruise
depressurization valve stops the hydraulic power to the LE flap
and slat control valve. This makes sure that the LE flaps and
slats stay retracted.
If the airplane gets near a stall condition, the autoslat valve
sends full extend pressure to the LE slat actuators. This causes
the LE slats to move from the extend position to the full extend
position.
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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See the leading edge autoslat system section for more
information on the autoslat operation. (SECTION 27-83)
If two or more LE flaps or slats move away from the flap lever
position, then the LE UCM shutoff valve closes. This removes
the retract pressure from the LE flap and slat actuators and the
LE flaps and slats cannot move.
PTU Operation
If there is low pressure from the system B EDP, the power
transfer unit (PTU) can supply hydraulic power for the autoslat
operation. The PTU operates when all of these conditions occur:
* Airplane is in the air
* TE flaps are between 0 and 15
* System B EDP hydraulic pressure is low.
See the power transfer unit system section for more information
on the PTU. (SECTION 29-25)
Alternate Operation
During the alternate operation, the LE standby shutoff valve
supplies standby hydraulic system power. The flow limiting
valve limits the flow of hydraulic fluid to 2.1 gpm. In the alternate
operation, the LE flaps and slats extend only. The LE flaps and
slats can not retract in the alternate operation.
See the standby hydraulic system section for more information
on the standby hydraulic system. (SECTION 29-22)
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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27-81-00-016
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
LE FLAP AND SLAT CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-81-00-016
General
During alternate operation, the alternate flaps switches control
the operation of the LE flap and slat actuators.
Arm
When you move the alternate flaps arm switch to the arm
position, electrical power becomes available to the alternate
flaps control switch. The arm switch supplies signals to the
standby hydraulic system to operate the standby hydraulic
electric motor driven pump (EMDP).
Extend
When you move the alternate flaps control switch to the down
position, the LE standby shutoff valve relay energizes. This
sends a signal to the LE standby shutoff valve and to the power
transfer unit (PTU). The LE standby shutoff valve opens. If the
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