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the LE normal operation if two or more LE flaps or slats move
away from their commanded position.
There is position indication in the flight deck for all the LE
devices during normal operation and alternate operation.
During the normal operation, if the airplane comes near a stall
condition, the autoslat function fully extends the LE slats. This
helps prevent a stall.
You can do tests of the LE flaps and slats with built in test
equipment (BITE) in the flap/slat electronic unit (FSEU). The
FSEU BITE also permits you to see other maintenance data.
Abbreviations and Acronyms
* ADIRU - air data inertial reference unit
* alt - alternate
* BITE - built-in test equipment
* cntl - control
* depress - depressurization
* DFDAU - digital flight data acquisition unit
* EMDP - electric motor-driven pump
* ext - extend
* FCC - flight control computer
* FSEU - flap/slat electronic unit
* gnd - ground
* GPM - gallons per minute
* inbd - inboard
* ind - indication
* LE - leading edge
* MLG - main landing gear
* PDU - power drive unit
* prox - proximity
* PSEU - proximity switch electronics unit
* PTU - power transfer unit
* sec - second(s)
* sect - section
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* SMYD - stall management yaw damper
* SOV - shutoff valve
* stdby - standby
* TE - trailing edge
* T/R - thrust reverser
* UCM - uncommanded motion
* vlv - valve
* WW - wheel well.
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General
The LE flaps and slats use hydraulic power to move. For the
normal operation, hydraulic system B supplies hydraulic power.
The commands for the LE flaps and slats come from the TE flap
system. During the alternate operation, the standby hydraulic
system supplies hydraulic power. The commands come from
the alternate flaps switches.
Normal Operation
The TE flap system sends inputs to the LE flap and slat control
valve during normal operation. The flap lever moves a cable
system that supplies a mechanical input to the TE flap system.
As the TE flaps move, feedback from the TE flap system moves
the LE flap and slat control valve. The LE flap and slat control
valve is in the TE flap control unit.
The LE flap and slat control valve receives hydraulic system B
pressure from the LE cruise depressurization valve. The LE flap
and slat control valve sends hydraulic power through the
autoslat control valve to the LE flap and slat actuators. These
actuators move the LE flaps and slats.
The LE flap and slat proximity sensors send signals to the flap/
slat electronics unit (FSEU). The FSEU sends this data to the LE
devices annunciator panel and the LE flaps lights in the flight
deck.
The FSEU closes the LE cruise depressurization valve when the
airplane is in a cruise condition. This valve stops the hydraulic
power to the LE flap and slat actuators to prevent extension.
The FSEU closes the LE uncommanded motion (UCM) shutoff
valve if there is an uncommanded motion of the LE devices.
This occurs when two or more LE devices move away from their
commanded position. The LE uncommanded motion (UCM)
shutoff valve removes the retract pressure from the LE flap and
slat actuators. This prevents more movement of the LE flaps
and slats.
If the LE slats are at the extend position and the airplane gets
near a stall condition, the stall management yaw dampers
(SMYDs) send signals to the autoslat control valve. The autoslat
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