*
EICAS and secondary engine displays

*
At least one ND to be controlled by either pilot

*
Crew warnings, alerts, and cautions

*
MFD availability (not required full time)

*
Displays at a 10 Hz rate.

Two failures also cause the status message DISPLAY RESOURCES to show. There is no master minimum equipment list (MMEL) relief for this condition.
Three Display Channel Failures
If three failures occur, the last channel can fully support three display units.
This channel can send data to all display formats. In this condition, the GG sends data to three displays and then echoes or duplicates displays on other DUs.
After the third channel failure, the system has the capability for:
*
Single PFD and single ND generation

*
EICAS and secondary engine displays with warnings and alerts on EICAS (compacted EICAS)

*
MFD availability in place of the ND.

This condition causes the status message DISPLAY PROCESSING and the caution message SGL SOURCE DISPLAYS to show. There is no MMEL relief for this condition.
Graphics Generator to Display Unit Interfaces Summary
There are many possible combinations of display channel failures and switch positions. The above text and chart that follows summarizes several of these conditions.
CONDITION  LOB DU  LIB DU  CU DU  CL DU  RIB DU  ROB DU 
NORMAL GGs  L10  L10  L11  L11  R11  R11 
CAPT ALTN  L11  L11  R10  R10  R11  R11 
CDCP ALTN  L10  L10  R10  R10  R11  R11 

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PRIMARY DISPLAY SYSTEM -DISPLAY CONTROL FUNCTIONAL DESCRIPTION

CONDITION  LOB DU  LIB DU  CU DU  CL DU  RIB DU  ROB DU 
F/O ALTN  L10  L10  L11  L11  R10  R10 
L 10 BAD  L11  L11  R10  R10  R11  R11 
L 11 BAD  L10  L10  R10  R10  R11  R11 
R 10 BAD  L10  L10  L11  L11  R11  R11 
R 11 BAD  L10  L10  L11  L11  R10  R10 
L10 BAD CAPT ALTN  R10  R10  R10  R11  R11  R11 
L11 BAD CTR ALTN  L10  L10  L10  R11  R11  R11 
R10 BAD F/O ALTN  L10  L10  L10  L11  L11  L11 
R11 BAD F/O ALTN  L10  L10  L10  L11  L11  L11 
L10L11 BAD  R10  R10  R10  R11  R11  R11 
R10R11 BAD  L10  L10  L10  L11  L11  L11 
L10R10 BAD  L11  L11  L11  R11  R11  R11 
L10R11 BAD  L11  L11  L11  R10  R10  R10 
L11R10 BAD  L10  L10  L10  R11  R11  R11 
L11R11 BAD  L10  L10  L10  R10  R10  R10 
ANY 3 FAIL  C PFD  C ND  EICAS  BLANK  C ND  C PFD 
C = Captain 

Training Information Point
On the ground, the display system will try to switch back to a previously failed graphics generator. This will cause the display unit to blink on and off. This condition lets the maintenance personnel troubleshoot an intermittent GG or wiring problem. There is no limit to the number of times the display system will try to switch.
In the air, the display system will try to switch back to a bad GG up to four times. After four tries, redundancy logic takes effect and the blinking stops.
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PRIMARY DISPLAY SYSTEM -DISPLAY CONTROL FUNCTIONAL DESCRIPTION

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PRIMARY DISPLAY SYSTEM -EICAS DISPLAY FORMAT

General
The EICAS display normally shows on the upper center display unit (DU). When the upper center DU fails, the display automatically shows on the lower center DU. The display shows primary engine parameters and other data which require continuous display for flight safety. The EICAS display shows:
*
Total air temperature (TAT) and assumed temperature

*
Thrust reference mode

*
Thrust reverser indication

*
Primary engine parameters
　
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