*
SEC EXT; the slats are commanded to extend in the secondary mode

*
SEC RET; the slats are commanded to retract in the secondary mode.

The status of the slat drive mode is one of the following:

*
LO SPD; the slats are moving at low speed in the primary mode

*
HI SPD; the slats are moving at high speed in the primary mode

*
CLUTCH; the electric motor clutch is engaged.

The status of the shutoff valve command is either OPEN or CLOSED.
Slat Position Sensors

The right center of the page shows the position of the slat position sensors in degrees of sensor rotation. If some of this data is invalid, there is no indication for the bad value.
Slat Skew Sensors

The center of the page shows the status of the slat skew sensors. The page shows one of the following for each sensor:
*
NEAR; the target is near the sensor

*
FAR; the target is far from the sensor

*
FAIL; the sensor is defective.

If some of this data is invalid, there is no indication for the bad value.
Flap Commands
The bottom left of the page shows the status of the flap commands from the FSEU in control. The status of the flap drive command is one of the following:
*
PRI EXT; the flaps are commanded to extend in the primary mode

*
PRI RET; the flaps are commanded to retract in the primary mode

*
SEC EXT; the flaps are commanded to extend in the secondary mode

*
SEC RET; the flaps are commanded to retract in the secondary mode.

The status of the flaps drive mode is one of the following:
*
LO SPD; the flaps are moving at low speed in the primary mode

*
HI SPD; the flaps are moving at high speed in the primary mode

*
CLUTCH; the electric motor clutch is engaged.

The status of the shutoff valve command is either OPEN or CLOSED.

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HIGH LIFT CONTROL -INDICATIONS -MAINTENANCE PAGE FORMAT

Flap Position Sensors

The bottom right of the page shows the position of the flap position sensors in degrees of sensor rotation. If some of this data is invalid, there is no indication for the bad value.
Flap Skew Sensors

The bottom of the page shows the voltage of the flap skew sensors in volts. If some of this data is invalid, there is no indication for the bad value.
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HIGH LIFT CONTROL -INDICATIONS -MAINTENANCE PAGE FORMAT

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HIGH LIFT CONTROL -SYSTEM TESTS

General

The FSEUs control the operation of the MAT tests. All the MAT tests for the HLCS are interactive tests. You are able to select which FSEU to control each of the tests. There are no MAT operational tests for the HLCS.
The system tests for the HLCS include:
*
Primary System Test -FSEU 1

*
Primary System Test -FSEU 2

*
Secondary System Test -FSEU 1

*
Secondary System Test -FSEU 2.

All of these tests can test the flaps only, the slats only, or both. Also, all of these tests will cause the flaps and slats to move.
Primary System Test -FSEU 1 (FSEU 2)

This test makes sure that FSEU 1 (FSEU 2) can control the HLCS correctly in hydraulic mode.
Secondary System Test -FSEU 1 (FSEU 2)

This test makes sure that FSEU 1 (FSEU 2) can control the HLCS correctly in electric mode.
Training Information Point
The MAT tests for the HLCS use a ground test software in the FSEUs that is different than the test software used during flight. If the MAT test fails, the maintenance message will be different than the maintenance message reported by the flight test software.

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777 AIRCRAFT MAINTENANCE MANUAL

HIGH LIFT CONTROL -SYSTEM TESTS

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HIGH LIFT CONTROL -LRU REPLACEMENT TESTS

General
The LRU replacement tests for the HLCS include:
*
FSEU 1

*
FSEU 2

*
Flaps primary control valve test -FSEU 1

*
Flaps primary control valve test -FSEU 2

*
Slats primary control valve test -FSEU 1

*
Slats primary control valve test -FSEU 2

*
Inboard slat skew test -FSEU 1

*
Inboard slat skew test -FSEU 2.
　
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