Secondary Mode Display
The secondary mode display shows when either the flaps or slats are in the secondary mode. This display has separate indications for:
*
The left wing flaps

*
The right wing flaps

*
The left wing slats

*
The right wing slats.

The two upper indications show the slat positions. The two lower indications show the flap positions. All four indications are black when the flaps and slats are fully retracted. When the slats extend, a white tape fills the upper indications from the bottom up. When the flaps extend, a white tape fills the lower indications from the top down.
The secondary mode display shows a command bar and detent number. These operate the same as for the primary mode display.
After the flaps and slats are fully retracted, the secondary mode display goes out of view and the primary mode display shows. After 10 seconds, the primary mode display also goes out of view.
If the flaps (or slats) drive system fails, the related indications change from white to amber.
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If the left (or right) slat position data is invalid, the left (or right) upper tape and command bar go out of view. If the left (or right) flap position data is invalid, the left (or right) lower tape and command bar go out of view. If the flap lever position data is invalid, the detent number goes out of view.
Alternate Mode Display

The alternate mode display shows when you push the alternate flaps arm switch.
The alternate mode display has almost the same format as the secondary mode display. The difference is that the alternate mode display does not have the command bar, but has tick marks and reference detent numbers to identify the flap and slat positions.
If the left (or right) slat position data is invalid, the left (or right) upper tape and tick marks go out of view. If the left (or right) flap position data is invalid, the left (or right) lower tape, tick marks, and reference detent numbers go out of view.
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General

The high lift maintenance page format contains data from each FSEU. This includes the following data:
*
Systems ARINC 629 data buses

*
Flap lever position sensors

*
Slat commands

*
Slat position sensors

*
Slat skew sensors

*
Flap commands

*
Flap position sensors

*
Flap skew sensors.

There are three different display modes:
*
Real time mode

*
Manual event mode

*
Auto event mode.

The word MANUAL or AUTO at the top of the page identifies the manual or auto event page. The message that caused the auto event is at bottom left of the page. The time of the event is at the bottom right.
Systems ARINC 629 Data Buses

The top of the page shows data that each FSEU receives from the systems ARINC 629 data buses. The first row shows the control status of each FSEU. The status of the FSEU is one of the following:
*
IN CONTROL; the FSEU is in control of the HLCS

*
ALTN ARM; the alternate mode is armed

*
LOADING; the FSEU is loading software

*
TEST; the FSEU is in test

*
FAULT; the FSEU has detected a lane fault

*
STANDBY; none of the other status words are applicable.

The page then shows the airspeed in knots and the center hydraulic system pressure in psi. If this data is invalid, there is no indication.
Below these are the status of the commands for autoslat, load relief, and to the autoslat priority valves. At the bottom of this list is the air/ground status.
Flap Lever Position Sensor
The top left of the page shows the voltage of each RVDT in the flap lever position sensor. If some of this data is invalid, there is no indication for the bad value.
Slat Commands
The left center of the page shows the status of the slat commands from the FSEU in control. The status of the slats drive command is one of the following:
*
PRI EXT; the slats are commanded to extend in the primary mode

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

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