*
Green -multiple state data fields with large font (ON) and VOR tuned navigational aids

*
Cyan -ADF tuned navigational aids

*
Shaded white -data that modifies the flight plan.

The CDU shows this data in white:
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FMCS -CONTROL DISPLAY UNIT

*
Text

*
Alert and advisory messages

*
Multiple state data fields with small font (off)

*
Tuned ILS navigational aids

*
Line titles

*
Dashes, except when the dash is an integral part of the data field

*
Slashes, except when the slash has data on both sides.

CDU Controls
These are the primary controls for the CDU:
*
Line select keys

*
Function keys

*
Mode keys

*
Alpha-numeric keys

*
Special keys.

Line Select Keys
Line select keys 1L to 6L and 1R to 6R, permit the operator to do these things:
*
Transfer data from the scratchpad to a data field

*
Copy data from a data field to the scratchpad

*
Delete data from a data field

*
Select an operation. (This occurs when the CDU operates as a control panel in the alternate mode, EFIS or DSP control panel. In this case, the line select key acts as a toggle switch to select between two states (OFF or ON))

* Select another page. This occurs when a caret (prompt) and a page title show next to a line select key.
Not all keys permit all actions. Keys can have different functions on other pages.
Function Keys
These are the three function keys:
*
Execute (EXEC)

*
NEXT PAGE

*
Previous page (PREV PAGE).

*
Use the EXEC key to execute (make active) or to modify a page with data entry when the EXEC light comes on.

*
Use the NEXT PAGE key to go to the next page when the page count shows more than one page (1/X, 2/X ...).

*
Use the PREV PAGE key to go back one page when the page count shows more than one page (1/X, 2/X ...).

Mode Keys
The mode keys select the page for the current airplane condition. These are the mode keys:
*
Initialization/reference (INIT/REF)

*
Route (RTE) page

*
Departure/arrival (DEP/ARR) page

*
Alternate (ALTN) page

*
Vertical navigation (VNAV) pages

*
FIX page

*
LEGS page

*
HOLD page

EFFECTIVITY BEJ ALL  34-61-00 
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FMCS -CONTROL DISPLAY UNIT

*
FMC COMM page

*
Progress (PROG) pages

*
MENU page

*
Navigation radio page (NAV/RAD).

Alpha-numeric Keys
The alpha-numeric keys permit the operator to type alpha-numeric data into the scratchpad. The operator can use the line select key to enter scratchpad data into a data field. Some data fields do not let the operator enter data.
Special keys
The keyboard has some special keys in addition to the alpha-numeric keys. These are the special keys:
*
Change sign (+/-)

*
Space (SP)

*
Slash (/)

*
Clear (CLR)

*
Delete (DEL).

The change sign (+/-), SP keys and slash (/) keys are standard keys on a keyboard.
Use the CLR key to remove a single alpha-numeric character in the scratchpad or an alert or advisory message from the scratchpad with one push. Hold the CLR key down for one second to remove all scratchpad data.
EFFECTIVITY
BEJ ALL

A push of the DEL key puts the word DELETE in the CDU scratchpad and this permits the operator to delete a data field with the line select key next to the data field. The DEL key does not work when the scratchpad contains data. Some data fields do not permit the DEL key function. In this case, the INVALID DELETE message shows in the CDU sratchpad.
Annunciators
The annunciators come on to show status. These are the annunciators:
*
Display (DSPY)

*
Message (MSG)

*
Offset (OFST).

DSPY shows when the current page does not relate to the active flight plan or present active mode or function. The DSPY comes on, as an example, when the route page 2 of 3 (2/3) shows on the LCD and the airplane is at the departure gate.
The MSG annunciator comes on whenever an alert or an advisory message shows in the scratchpad. The CDU or the FMCF can cause this to occur.
The OFST annunciator comes on when the airplane is in the air and an offset route is active. An offset route is a route parallel (left or right) to the active route.
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