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arm. The sensors are at the same location on the fixed leading
edge, but on opposite sides of the hinge arm. The targets are on
opposite sides of the hinge arm and at different locations on the
hinge arm.
Each LE flap proximity sensor monitors the position of only one
target. When the LE flaps are in the retract position, the retract
sensor for each LE flap is in a target-near condition and the
extend sensor is in a target-far condition. When the LE flap is in
the extend position, the retract sensor changes to a target-far
condition and the extend sensor changes to a target-near
condition.
LE FLAP AND SLAT POSITION INDICATING SYSTEM - FUNCTIONAL DESCRIPTION 1
EFFECTIVITY
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LE Slat Position Indication
There are 22 LE slat proximity sensors.
For LE slats 1 and 8, there are two proximity sensors for each
slat. These sensors are the inboard sensor and the outboard
sensor. Each of these sensors have two targets.
For LE slats 2 thru 7, there are three proximity sensors for each
slat instead of two. This provides a more accurate monitor of the
surface position.
For LE slats 2 thru 7, the sensors are identified as the retract
sensor, the inboard sensor, and the outboard sensor. Each of
these sensors have one target.
Retract
When the LE slats are retracted, the inboard sensors and the
outboard sensors for LE slats 1 and 8 have a target near. For LE
slats 2 thru 7, only the retract sensors have a target near.
Extend and Full Extend
When the LE slats are in the extend position, the inboard
sensors for all the LE slats have a target near and the outboard
sensors are in a target-far condition. When the LE slats are in
the full extend position, the inboard sensors change to a targetfar
condition and the outboard sensors change to a target-near
condition.
Slat Failures
The FSEU uses the proximity sensor data to find if a slat did not
move to the correct position. If the position of one LE flap or slat
is not in the same position as the other surfaces, the FSEU
commands the LE FLAPS TRANSIT light to show.
For LE slats 2 thru 7, only one sensor has a target near at the
retract, extend, or full extend positions. If two sensors have a
target near, the slat has a failure and the FSEU commands the
LE FLAPS TRANSIT light to show.
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EFFECTIVITY
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Functional Description
There are 30 LE flap and slat proximity sensors that send data
to the FSEU. The FSEU uses this data for position indication on
the LE devices annunciator panel. The FSEU also sends this
data to these components:
* SMYDs for stall warning
* FDAU for the flight data recorder
* PSEU for takeoff warning.
LE FLAPS EXT Light
The LE FLAPS EXT light shows when all of the LE flaps and
slats are in an extend or full extend position.
LE FLAPS TRANSIT Light
The LE FLAPS TRANSIT light shows when a LE flap or slat is not
in the correct position or when a LE uncommanded motion
(UCM) occurs.
LE Flap or Slat Not in Correct Position
The FSEU compares the LE flap and slat positions with the flap
lever position and the TE flap position to make sure the LE flaps
　
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