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and slats move to the correct position.
When the TE flaps are at up, the LE flaps and slats should be at
the retract position. When the TE flaps are at 1, 2, or 5, the LE
flaps and slats should be at the extend position. When the TE
flaps are at 10 or more, the LE flaps should be at the extend
position and the LE slats should be at the full extend position. If
any LE flap or slat is not in the correct position, the LE FLAPS
TRANSIT light shows.
LE Uncommanded Motion (UCM)
A LE uncommanded motion (UCM) occurs when two or more LE
flaps or slats move away from their commanded position. If this
occurs, the FSEU turns on the LE FLAPS TRANSIT light and
sends a command to the LE UCM shutoff valve to stop the
movement of the LE flaps and slats.
LE Devices Annunciator Panel
These are the lights on the LE devices annunciator panel:
* Transit (amber)
* Extend (green)
* Full extend (green).
If a LE flap or slat is not in the correct position, one of these
indications will show on the LE devices annunciator panel:
* TRANSIT amber light comes on
* Incorrect EXT or FULL EXT green light comes on
* No lights come on.
LE FLAP AND SLAT POSITION INDICATING SYSTEM - FUNCTIONAL DESCRIPTION 3
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Operation
When the LE flaps and slats are retracted, all the lights go out of
view.
When the TE flaps move from 0 to 1, the LE FLAPS TRANSIT
light shows. When each LE flap and slat moves, the transit light
for each surface shows on the LE devices annunciator panel.
When each LE flap and slat is in the extend position, the extend
light shows and the transit light goes out of view. When all the
LE flaps and slats are in the extend position, the LE FLAPS
TRANSIT light goes out of view and the LE FLAPS EXT light
shows.
When the TE flaps move from 5 to 10, the LE FLAPS EXT light
goes out of view and the LE FLAPS TRANSIT light shows. When
each LE slat moves, the transit light for each surface shows and
the extend light goes out of view. When each LE slat is in the full
extend position, the full extend light shows and the transit light
goes out of view. When all the LE slats are in the full extend
position, the LE FLAPS TRANSIT light goes out of view and the
LE FLAPS EXT light shows.
Autoslat Operation
During an autoslat extension, the FSEU inhibits the LE FLAPS
TRANSIT light. The SMYDs send an autoslat signal to the FSEU
when the airplane gets near a stall condition. When this occurs,
the FSEU gives a 12-second time delay to the LE FLAPS
TRANSIT light. This causes the LE FLAPS TRANSIT light to not
show during autoslat extension of the LE slats.
When the SMYDs remove the autoslat command, the 12-second
time delays becomes active again. This causes the LE FLAPS
TRANSIT light to not show during retraction of the LE slats after
an autoslat extension.
Other Interfaces
The FSEU sends LE flap and slat position data to the PSEU for
the takeoff warning logic. The takeoff warning horn sounds
during a takeoff roll if one of these conditions occurs:
* A LE UCM condition
* A LE flap is not in the extend position
* A LE slat is not in the extend or full extend position.
The FSEU also sends LE flap and slat position data to the flight
data acquisition unit for the flight data recorder.
LE FLAP AND SLAT POSITION INDICATING SYSTEM - FUNCTIONAL DESCRIPTION 3
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-005
LE FLAP AND SLAT POSITION INDICATING SYSTEM - FUNCTIONAL DESCRIPTION 3
LE FLAP AND SLAT POSITION INDICATING SYSTEM - FUNCTIONAL DESCRIPTION 3
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-005
CHAPTER
28
Fuel
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