The FSEUs send the slat position data to the airplane information management system (AIMS). The AIMS uses this data to display the flap/slat position indication on the EICAS display or the EICAS compacted engine display.
The FSEUs send the slat position data to the AIMS whenever the data is valid. This permits flap/slat position indication in all three HLCS modes. The three flap/slat position indications are:
*
Primary mode display
*
Secondary mode display
*
Alternate mode display.
Failure Detection
Monitors in the FSEUs compare the slat position data to the slat commands. These monitors find failures in the HLCS and the slat drive system.
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SLAT POSITION INDICATION -GENERAL DESCRIPTION
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SLAT POSITION INDICATION -SLAT POSITION SENSORS
Purpose
The slat position sensors supply slat position data to the FSEUs for slat control, flap/slat indication, and failure detection.
Location
The slat position sensors are on the two no-back brake offset gearboxes at the outboard ends of the slat torque tubes. Remove the access panel under the wing to get access.
Physical Description
There are two slat position sensors on each of the no-back brake offset gearboxes at the outboard end of the wings. The slat position sensors are resolvers and they each have a rig indicator. The rig indicator has two marks that rotate when the position sensor shaft rotates. The two marks are in line when the slat drive line is at the UP position. All of these sensors are interchangeable with each other and with the flap position sensors.
Training Information Point
Install the slat position sensors with the slats rigged at the up position. Make sure the index marks for the rig indicator are aligned.
If the index marks on the position sensor are not aligned, you must push the shaft lock pin to turn the shaft.
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SLAT POSITION INDICATION -SLAT POSITION SENSORS
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SLAT POSITION INDICATION -FUNCTIONAL DESCRIPTION
General
There are four slat position sensors, two for the right wing slats and two for the left wing slats. Each FSEU interfaces with one sensor for the left slats and one sensor for the right slats. Separate power sources supply electrical power to the sensors.
Functional Description
The slat position sensors send slat position data to both the control and monitor channels. Both of these channels use this data for:
*
Slat position indication
*
Primary mode control
*
Secondary mode control
*
Failure detection.
See the high lift control section for more information about the indications (SECTION 27-03).
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
SLAT SKEW DETECTION -GENERAL DESCRIPTION
Purpose
The slat skew detection system monitors the relative position of all the slats except for slats 1 and 14. The system does not monitor the outboard end of slats 2 and 13 and the inboard end of slats 6 and 9 for skew. The FSEUs stop the primary and secondary mode slat operation if there is a skew, an asymmetry or a secondary mode disagree condition.
Except for slats 1 and 14, the slats are in a skew when the inboard end of one or more slats is not aligned with its outboard end.
There is slat asymmetry condition when the slats on the left wing do not align with the slats on the right wing.
There is a secondary mode disagree when the slats do not move or move too slowly after a command to move in secondary mode.
Interface
The slat skew detection system has 12 proximity sensors, two for the outboard slats and four for the inboard slat on each wing.
The sensors for the inboard slat do a check of the position of targets on the inboard slat auxiliary arms. The sensors for the outboard slats are on the slat skew mechanism. This mechanism attaches to a cable that is in slats 2 through 6 in the left wing and slats 9 through 13 in the right wing. If an outboard slat (except for the most outboard slat) moves out of alignment, the cable pulls a target on the mechanism away from the sensors.
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