in other airplanes. The OPCs set the customer

configuration options.
Approximately 5 minutes is necessary to do a load of
the OPC into each DEU.

Display Unit Data Base (DUDB)
There are different types of display units for the
common display system. The DUs are interchangeable. The

DEU must have data about the drive signals for each type of DU. The DU data base has the data about the drive signals.
You can do a load of the DUDB into the DEU. Approximately 5 minutes are necessary to do a load of the DUDB into each DEU.
Operation to Load Software
To do a software load into the DEU, use the data loader control panel. The engines must be off.
Select the DEU position on the lower switch on the data loader control panel. Select the left or right position on the upper switch on the data loader control panel.
Put the diskette in the airborne data loader.
When the data load is complete, you can do a check that the new software part number shows on the CDS IDENT/CONFIG page. This page shows this data:
-OPS part number
-OPC part number
-DUDB part number
-DEU H/W part number
-Program pins.

Compatibility Checks
The DEU finds if these are not compatible:

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-OPS and DEU hardware
-Program pins in DEU 1 and DEU 2
-OPS to airplane type
-OPS to OPC
-DEU 1 to DEU 2 software.
If the OPS is not compatible with the DEU, the OPS does not do a load into the DEU. The other compatibility checks are done at initialization. If the DEU finds something that is not compatible, you see a CDS FAULT maintenance message.
Operation to Download BITE Data
The DEU can do a download of BITE data to a diskette. The diskette must have a format that accepts the download of the data.
To do a download of BITE data, put the diskette in the airborne data loader. Select the DEU position on the lower switch on the data loader control panel. Select the L or R position on the upper switch on the data loader control panel. The DEU automatically does a download of the data to the diskette. The airborne data loader shows that the load is done.
Training Information Point
When you set the two switches to select a DEU on the data Loader control panel, that DEU does not operate the display units. The other DEU supplies the data for all 6 DUs, and CDS FAULT shows.

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OPTIONAL SYSTEMS NOT ACTIVE1 ARE LABELED INOP.

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General
The CDS has maintenance data that you can see on the flight management systems control display unit (CDU).
To get access to the maintenance data, select CDS on line select key (LSK) 5L from the MAINT BITE INDEX. This shows the CDS BITE page.
On the CDS BITE INDEX page, select DEU 1 on LSK 1L or DEU 2 on LSK 2L. This shows the CDS MAINT/BITE main menu for the DEU 1 or DEU 2.
CDS BITE Main Menu
There are five maintenance procedures that you do through the CDS MAINT/BITE main menu. These are the procedures:
-Check of the current status -Check of the inflight faults -Ground tests -Check of the identification and configuration data -Check of the input monitoring discrete status.
To do a check of the current status, select LSK 1L.
To do a check of the inflight faults, select LSK 2L.
To operate a ground test, select LSK 3L. You can not operate a ground test if the engines are on because there is no carrot for LSK 3L. The ground tests have an effect what shows on the DUs. When the engines are on, it is important to see engine data on the DUs.
To do a check of the identification and configuration information, select LSK 4L.
To do a check of the input monitoring discrete status, select LSK 5L.

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General
To do a check of the current status, select CURRENT STATUS on line select key (LSK) 1L from the CDS MAIN MENU. This shows the CURRENT STATUS page.
Any active faults detected by the DEU shows.
CURRENT STATUS Page
　
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