PRIMARY DISPLAY SYSTEM -DISPLAY SWITCHING PANELS
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777 AIRCRAFT MAINTENANCE MANUAL
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General
The left and right instrument source select panels (ISSPs) and the center display control panel supply additional controls for the primary display system. Each source switch permits alternate display source for the flight crew member. These are the alternate source display control switches:
*
Navigation source switch
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Display control source switch
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Air data/attitude source switch
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Center display control source switch
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Event record switch.
The three display source control (DSPL CTRL) switches in the flight deck supply manual control for the display channel outputs from the two graphics generators in each AIMS cabinet.
Instrument Source Select Panel (ISSP) Switches
The captain and first officer use the ISSP switches to select an alternate display source.
Use the navigation source switch (NAV) to select the CDU as an alternate map source.
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Use the display control source switch (DSPL CTRL) on the ISSP to control the display channels source for the respective inboard and outboard display units. During normal operation, the captain’s DUs use graphics generator M010 in the left AIMS cabinet and the first officer’s DUs use graphics generator M011 in the right AIMS cabinet.
Use the air data/attitude source switch (AIR DATA/ATT) to select an alternate attitude and other ADIRU source inputs.
The center display control source switch (DSPL CTRL) is on the center display control panel. This switch controls the display source for the two center display units. During normal operation, these DUs use graphics generator M011 in the Left AIMS cabinet.
In the normal configuration, the switches are in the out position and no legend shows. A failure of a display channel causes the DUs to automatically switch to an alternate source. No legend shows in this case.
The selection of any of the switches, causes the display system to assume a failure and automatically change display channels. The NAV switch legend shows CDU when you select the NAV switch for alternate navigation source. In this case, the onside CDU or closest valid CDU. All other switches show ALTN when you select them.
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If the display system has lost input sources, you can not cause the entire system to fail through the selection of manual overrides. The system ignores the switch(es) with only one display channel left.
EICAS Event Record Switch
The EICAS event record switch is an additional primary display system control on the center display control panel. Push the this switch to store a snapshot for each maintenance page.
Training Information Point
All display control source switches are line replaceable.
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Purpose
The master caution lights alert the flight crew visually of a condition(s) that require crew awareness. You use the master warning/caution reset switch to reset the caution annunciation.
The master caution lights come on when a caution message shows on the EICAS display.
Training Information Point
When the master caution lights come on and there is a caution message on the EICAS display, you also hear a caution aural. The warning electronic system (WES) makes the caution aural. For all caution messages except ALTITUDE ALERT and SPEEDBRAKES EXT, AIMS sends a digital request to the WES to make the caution aural. WES makes the aural request for the caution messages ALTITUDE ALERT and SPEEDBRAKES EXT.
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