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DSPLY SOURCE Message
The DSPLY SOURCE message shows when all the display units
get data from one DEU. This occurs when the display source
selector is in the ALL ON 1 or the ALL ON 2 position.
NOTE: Set the display source selector 1-2 seconds between
each position. Fast changes between each position of
the display source selector can cause the two DEUs to
show incorrect data.
After both engine are on, this message also shows when a DEU
failure causes all the DUs to get data from one DEU. On the
ground with the engines off, the CDS FAULT message replaces
the DSPLY SOURCE message. The DSPLY SOURCE message
does not replace CDS FAULT when the hot battery bus power is
not available because both DEUs are still operating. The DSPLY
SOURCE message does not replace CDS FAULT when the data
load switch is in the DEU 1 or DEU 2 position. This is because
the DEUs only load software on the ground when at least one
engine is not running. If you have this fault and start both
engines, the DEUs ignore the data loader and become
operational.
This message shows on the captain and the first officer PFD.
CDS MAINT Message
The CDS MAINT message shows when one of these circuit
cards fails in either DEU:
* Graphic generator
* Discrete input/output
* Analog input/output.
This message shows on the captain and the first officer PFD.
This message shows only when the airplane is on the ground
and at least one engine is off.
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CDS FAULT Message
The CDS FAULT message shows when there is a total DEU
failure. A total DEU failure is when any one of these circuit cards
fails:
* Input/output controller and ARINC 429 input/output
* Power supply
* Processor.
The CDS FAULT message shows if two or more of these circuit
cards fail in a DEU or any one fails in both DEUs:
* Graphic generator
* Discrete input/output
* Analog input/output.
The CDS FAULT message shows if the DEU initializes and it
detects that any of these are not compatible:
* Program pins in DEU 1 and DEU 2
* OPS and airplane type
* OPS and OPC
* OPC and OPS in DEU 1 and DEU 2.
For these conditions, the CDS FAULT message shows and is
removed when both engines start:
* Hot battery power is not available when the DEU initializes
* Data loader switch is in the DEU 1 or DEU 2 position.
The CDS FAULT message shows if there is a miscompare of the
N1, N2, or EGT data between DEU 1 and DEU 2.
This message shows on the captain and the first officer PFD.
The CDS FAULT message shows only when the airplane is on
the ground and at least one engine is off.
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DEU Software
You can load software in a DEU or download BITE data from a
DEU.
These are the types of software you can load in the DEUs:
* Operational software
* Operational program configuration
* Display unit data base.
Operational Software (OPS)
The operation software is the software that operates the DEU.
It takes a maximum of 90 minutes to load the OPS into each
DEU.
Operational Program Configuration (OPC)
The OPCs replace most of the hardware program pins used in
other airplanes. The OPCs define the customers configuration
options.
It takes approximately 5 minutes to load the OPC into each DEU.
Display Unit Data Base (DUDB)
There are several different types of display units for the
common display system. The DUs are interchangeable. The
　
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