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PRIMARY DISPLAY SYSTEM -DISPLAY SELECT PANEL
You can recall caution and advisory messages when you select the CANC/RCL switch again. Previous messages return if the conditions that cause them to show still exist. Red exceedance boxes that you cancelled also show.
Alternate DSP Functions
The three control display units (CDU) supply an alternate way to select the DSP functions. CDU menu selections enable the DSP functions.
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777 AIRCRAFT MAINTENANCE MANUAL
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PRIMARY DISPLAY SYSTEM -CONTROL DISPLAY UNIT MENUS
Purpose
The control display units (CDUs) provide menu selections for:
*
Maintenance page selections
*
Alternate EFIS control panel functions
*
Alternate display select panel (DSP) functions
Maintenance Page Selection
Use Line select key (LSK) five right (5R) on the CDU MENU page to show the maintenance page menu on the selected display unit. Then use the cursor control device to make other selections.
The maintenance page selection is available on all three CDUs.
You can select and see maintenance pages any time the airplane is on the ground or any time the airplane is above ten thousand feet.
EFIS Control Panel Functions
The onside CDU provides a menu selection for the EFIS control panel. The selection of the EFIS function on a CDU disables the onside EFIS control panel.
The center CDU is a backup for the left or right CDU for the EFIS control panel functions. IF both CDUs fail, the center CDU is a backup for the CDU that fails first.
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The CDU remembers the last valid settings of the EFIS CPs.
Use LSK 1R on the CDU MENU page, then LSK 2R to show the
EFIS CONTROL page.
Use the OPTIONS key (LSK 6R) on the EFIS CONTROL page to
show the EFIS OPTIONS page.
Use the CONTROL key (LSK 6R) on the EFIS OPTIONS page to
show the EFIS CONTROL page.
These two pages supply most of the functions of the EFIS CP.
Display Select Panel Functions
The DSP menu selection is available on all three CDUs.
The CDU remembers the last valid DSP selection.
The selection of the DSP function on a CDU disables the DSP and the DSP lights go out. It also disables the DSP menu selections on the other two CDUs.
Use DSP CTL (LSK 3R), then DSP (LSK 4R) to show the DSP DISPLAY MODES page.
Use the SYNOPTICS key (LSK 6R) on the DISPLAY MODES page to show the DISPLAY SYNOPTICS page.
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PRIMARY DISPLAY SYSTEM -CONTROL DISPLAY UNIT MENUS
Use the MODES key (LSK 6R) on the DISPLAY SYNOPTICS page to show the DISPLAY MODES page.
The CDU keys for the DSP functions operate the same as the switches on the DSP. The two pages supply all the functions of the DSP.
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PRIMARY DISPLAY SYSTEM -CURSOR CONTROL DEVICES
Purpose
Flight crews and maintenance personnel use the cursor control devices (CCD) for the data communication management function and to control the maintenance page format selections.
You also use the CCDs to control the electronic checklists.
Description
The CCD weighs four pounds. The CCD has its own power supply. The CCD has two electrical connectors, one for power and one for control. The CCD has three control switches and a touch pad.
Controls
The CCD has two momentary cursor location switches for display selection, one cursor select switch on the side for selection, and a touch pad.
The cursor location switches are:
*
LWR CTR: This switch connects the CCD to the lower center display
*
INBD: This switch connects the CCD to the inboard display.
Each cursor location switch has a cursor location light (green LED) that comes on when you select the switch.
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