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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-002
Purpose
The LE slat proximity sensors send LE slat position data to the
FSEU. The FSEU uses this data for position indication and
sends this data to other user systems.
Location
There are 22 proximity sensors for the LE slats. There are two
proximity sensors for LE slats 1 and 8 and three for slats 2 thru
7. LE slats 1 and 8 each have an inboard and an outboard
sensor. LE slats 1 and 8 have two targets for each sensor. LE
slats 2 thru 7 each have an inboard sensor, retract sensor, and
an outboard sensor. To get access to the LE slat proximity
sensors, remove the access panel under the wing.
The targets for the outboard sensors are on the outboard
auxiliary arms. The targets for the inboard sensors are on the
inboard auxiliary arms. The LE slat retract sensors are near the
slat actuators and have targets that are on the inside cove of the
LE slats.
Functional Description
The LE flap and slat position indication system uses two
different types of proximity sensors. The LE slat retract sensors
are score type of proximity sensors and use magnets for their
targets. All the other proximity sensors are the usual type and
use ferrous metal targets that are not magnets.
The FSEU monitors the impedance of the proximity sensors.
The impedance has a relation to the position of the targets to
the sensors. As the LE slats move, the targets move with them
and the impedance of the proximity sensors change.
The FSEU detects a target-near condition when a target is
directly in front of the sensor. When no part of a target is in front
of the sensor, the FSEU detects a target-far condition.
Training Information Point
The LE slat retract sensors are interchangeable with each
other. The LE slat inboard and outboard sensors are
interchangeable with each other and with the LE flap
proximity sensors.
Remove or install shims to adjust the sensors.
You can use the FSEU BITE to see the target gap information for
each sensor.
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE SLAT PROXIMITY SENSORS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-006
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE SLAT PROXIMITY SENSORS
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE SLAT PROXIMITY SENSORS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-006
Purpose
The LE devices annunciator panel shows the position of all the
LE flaps and slats independently.
Location
The LE devices annunciator panel is on the P5 aft overhead
panel.
Physical Description
The LE devices annunciator panel has green and amber lights
to show the position of each LE flap and slat. These are the
lights on the LE devices annunciator panel:
* Transit (amber)
* Extend (green)
* Full extend (green).
The LE devices annunciator panel has all three types of lights
for the LE slats, but only the transit and extend lights for the LE
flaps. This is because the LE flaps have only two positions.
Functional Description
When the LE flaps and slats are in the retract position, all the
lights go out of view. When the surfaces move, the transit lights
show. When the surfaces are in the extend position, the extend
lights show. When the LE slats are in the full extend position, the
full extend lights show.
There is a test switch on the LE devices annunciator panel.
When you push this switch, all the lights show.
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE DEVICES ANNUNCIATOR PANEL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-003
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE DEVICES ANNUNCIATOR PANEL
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE DEVICES ANNUNCIATOR PANEL
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-88-00-003
LE Flap Position Indication
There are eight LE flap proximity sensors. For each LE flap,
there is one sensor and one target on each side of the hinge
　
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