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Each FSEU has interfaces with one sensor at each skew sensor location to check for a skew condition. If a skew condition exists, the FSEUs stop the primary and secondary mode slat operation.
The slats are in a skew condition if a group of slats, a single slat, or the end of a slat is not in the correct position.
If the slats are in a skew, an asymmetry or a secondary mode disagree condition, the FSEUs stop the slat drive in primary and secondary modes. The FSEUs also send a signal to AIMS to show the SLATS DRIVE caution message. The slat position display changes to the secondary mode display and the slat position indication shows in amber.

EFFECTIVITY BEJ ALL  27-89-00 
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D633W101-BEJ  Sep 05/2002 

 

SLAT SKEW DETECTION -GENERAL DESCRIPTION

EFFECTIVITY BEJ ALL  27-89-00 
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SLAT SKEW DETECTION -INBOARD SLAT SKEW SENSORS AND TARGETS

Purpose

The inboard slat skew sensors and targets monitor the relative position of the inboard slats.
Location

The inboard slat skew targets attach to the inboard and outboard auxiliary arms of the inboard slat. The skew sensors attach to the support structure of the inboard and outboard auxiliary tracks in the fixed leading edge of the wing. Remove the access panel under the wing to get access.
Physical Description

The slat skew sensors are proximity sensors. Each sensor is a separate LRU and is interchangeable with the skew sensors for the outboard slats.
The targets are made of an aluminum housing with four magnet zones and four cover plates. The magnets are spaced so that the sensors are in target-near condition when the slats are in the up, sealed, and gapped positions.
Functional Description

The FSEUs monitor the impedance of the skew sensors. The impedance has a relation to the position of the targets to the sensors. As the slats move, the targets move with them and the impedance of the skew sensors change.
The FSEUs detect a target-near condition when a magnet zone is directly in front of the sensor. When no part of a magnet zone is in front of the sensor, the FSEUs detect a target-far condition. The FSEUs use this data for skew monitoring and failure detection.
Training Information Point
It is not necessary to rig the inboard slat skew sensors and targets after installation.

EFFECTIVITY BEJ ALL  27-89-00 
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D633W101-BEJ  Sep 05/2002 

 

SLAT SKEW DETECTION -INBOARD SLAT SKEW SENSORS AND TARGETS

EFFECTIVITY BEJ ALL  27-89-00 
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D633W101-BEJ  Jan 05/2002 

 

SLAT SKEW DETECTION -OUTBOARD SLAT SKEW MECHANISM AND CABLE

Purpose

The outboard slat skew mechanisms and cables monitor the position of all the outboard slats except slats 1 and 14, the outboard end of slats 2 and 13, and the inboard end of slats 6 and 9.
Location

The outboard slat skew mechanisms are in slat 2 and slat 13. The left cable attaches to slat 6 and to the slat skew mechanism in slat 2. The right cable attaches to slat 9 and to the slat skew mechanism in slat 13. The routing of the cables is along the inside of the slat cove skins. Remove the cove skin panels to get access to the mechanisms and cables.
Physical Description

The slat skew mechanism has two proximity sensors, a target, two latches, and internal springs. A cable attaches to the slat skew mechanism.
When the cable pulls on the skew mechanism, the target moves to the far position. The latches lock the target in the far position. The internal springs permit some movement of the cable before the latch sets. This adjusts for minor changes of slat position caused by wing flex, temperature changes, and normal slat movement.
The proximity sensors measure the magnetic field of the target. When the position of the target changes, the impedance of the sensors change.
Each proximity sensor is a separate LRU and is interchangeable with the skew sensors for the inboard slats. But they are not interchangeable with the landing gear proximity sensors.
Functional Description
The FSEUs monitor the impedance of the skew sensors. If one of the outboard slats (except for the most outboard slat) do not align with all the others, the slat that is out of alignment pulls on the cable. This pulls on the skew mechanism, which moves the target to the far position. As the target moves away from the sensors, the impedance of the skew sensors change. The FSEUs use this data for skew monitoring and failure detection.
Training Information Point
It is necessary to rig the cable after installation of the skew mechanism or cable.
WARNING: KEEP ALL PERSONNEL CLEAR OF THE SPACE BETWEEN THE SLIDER AND THE SENSORS ON THE SLAT SKEW MECHANISM. WHEN YOU RELEASE THE LATCHES, THE SLIDER WILL QUICKLY MOVE OUTBOARD. THIS CAN CAUSE INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT.
　
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