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does not show.
Center Display Units
If the upper center display unit has a failure, the lower center
display unit shows the primary engine display. If the secondary
engine display already shows on the lower center display unit,
the compacted engine display shows.
If the lower center display unit shows the secondary engine
display and has a failure, then the upper center display unit
shows the compacted engine display.
The lower center DU can show system data when the upper
center DU shows the primary or compacted engine display. For
this condition, if an exceedance occurs for secondary engine
data, then the upper center display unit changes. The upper
center display unit will show the compacted engine display with
the exceedance data shown in a box.
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Display Source Selector
The display source selector lets you select the DEU that
controls the displays. For maintenance, use the switch to
quickly find if there is a DEU failure or partial failure.
When the selector is in the AUTO position, DEU 1 controls the
captain and upper center display units and DEU 2 controls the
first officer and the lower center display units, if there are no
failures.
If any of the graphics generators (GG) circuit card assemblies
(CCA) fails in either DEU, the DEUs automatically change the
GG CCA that controls the display units.
When the selector is in the ALL ON ONE position, DEU 1
controls all six display units. When the selector is in the ALL ON
2, DEU 2 controls all six display units.
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Control Panel Select Switch
The control panel select switch lets you select which EFIS
control panel controls the PFD and ND displays. The control
panel select switch is a three position toggle switch.
When the switch is in the NORMAL position, the captain EFIS
control panel controls the captain PFD and ND displays and the
first officer EFIS control panel controls the first officer PFD and
ND displays.
When the switch is in the BOTH ON 1 position, the captain EFIS
control panel controls the captain and the first officer PFD and
ND displays.
When the switch is in the BOTH ON 2 position, the first officer
EFIS control panel controls the captain and the first officer PFD
and ND displays.
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CDS Messages
These are the CDS messages that can show:
* INSTR SWITCH
* DSPLY SOURCE
* CDS MAINT
* CDS FAULT.
INSTR SWITCH Message
The INSTR SWITCH message shows when the captain and first
officer displays use the same source for inertial reference data.
This message shows on the captain and the first officer PFD.
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