AIMS Intercabinet ARINC 629 Bus 2 Inputs
The AIMS ICB bus 2 supplies the data from the active FMCF when the left and right system ARINC 629 buses failed.
CDU Outputs Overview
The CDU sends digital and analog data to components and systems on these buses:
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Systems ARINC 629 buses

*
ARINC 429 buses

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ICB 2.

AMU Outputs -Systems ARINC 629 Bus (L)
This signal pairs the DME identifier audio with either VOR audio in the EFIS VOR mode or ILS audio in the EFIS approach mode.
AFDS Outputs -Systems ARINC 629 Bus (L and R)
When both FMCFs fail, the left CDU sends LNAV guidance commands to the AFDS. If the left CDU fails, the center CDU supplies the LNAV guidance commands. If the center CDU fails, the right CDU supplies the LNAV guidance data.
AIMS Outputs -Systems ARINC 629 Bus (L and R)
The CDUs send data to these AIMS functions on the left and right system buses:
* CMCF
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FMCS -FMCF INTERFACES -4

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Primary display function (PDF)

*
FDCF

*
FMCF.

The CDUs send fault reports and directed messages to the CMCF in the AIMS cabinets on the L and R systems ARINC 629 buses.
The CMCF in AIMS receives operational program load status data from the CDUs during data load operation.
The PDF in AIMS receives this data from the CDUs on the L and R systems ARINC 629 buses:
*
Map background data

*
Dynamic map data

*
EFIS CP data

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DSP data

*
Maintenance display enable signal.

The CDUs supply on-side map display. The center CDU acts as a back-up CDU for the left or right CDU if a CDU failure occurs.
The FMCFs receives scratchpad contents from the CDUs on the L and R system ARINC 629 buses.
The FMCFs get button push and protocol data from the CDUs through the left and right system ARINC 629 buses.
SDU Outputs -ARINC 429 Bus
Each CDU sends communication data to the SDU on a high speed ARINC 429 data bus.
PA/CI Controller Outputs -ARINC 429 Bus
The center CDU sends passenger address and cabin interphone data to the PA/CI controller on a high speed ARINC 429 bus.
CDU Outputs -AIMS Intercabinet Bus 2
If the left and right system ARINC 629 buses fail, then the CDUs send data to the FMCFs on the ICB 2.
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FMCS -CONTROL DISPLAY UNIT

Purpose
The CDU is the primary control and display interface for the FMCF. You use the CDU to enter flight plan data and performance data. Also, you use the CDU to manually tune the navigation radios and access maintenance pages. In the event of a EFIS control panel failure or display select panel (DSP) failure, you use the on-side CDU as a back-up EFIS control panel and any CDU as a back-up DSP.
Physical Features
The CDU weighs approximately 16 pounds. It is 9 inches tall,
10.5 inches deep and 5.75 inches wide. The LCD of the CDU shows the flight modes and data in color. The CDU needs 28v dc input power for normal operation. The CDUs use forced air through inlet and exhaust ports for cooling. The CDU shuts down at temperatures above 77C. It restarts when the temperature is below 77C. The CDU has these physical features:
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LCD

*
CDU controls

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Annunciators

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Light sensor

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Manual brightness control.

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LCD Display Format
The LCD shows 14 lines of data in various colors. Each line is 24 characters long. The top line is the page title field. The title field shows the function of the page and the current page number and the total number of pages for the page display. Lines 1L to 6L and 1R to 6R have title fields and data fields. The scratchpad area is below line 6L and 6R.
To enter or transfer data use the scratchpad. Alert and advisory messages also show in the scratchpad.
Some data fields can show box prompts or dashes. When the box prompts show, you must enter data into that data field. When the dashes show, data entry into that data field is optional.
Color
The LCD uses different colors to show flight activity and modes. Information shows in these colors:
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Black -background

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White -default color for text

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Magenta -next active waypoint in the flight plan
　
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