AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
MARCH 30, 2001
2-18-24
Page
5
Code
01
ACARS CONTROLS AND INDICATORS
CONTROL DISPLAY UNIT (CDU)
1 - STATUS AND ERROR MESSAGES
MSG PRINTING - The printer has started printing an uplinked
message.
UNABLE TO PRINT - The printer is unable to print an uplinked
message.
DATA REQD - The message selected cannot be sent
because the required data for downlink is not
available.
QUEUE FULL - The message cannot be sent because the
downlink buffer is full.
UNABLE TO SEND - The transmission of a message has been
manually initiated but the UniLink unit has
determined that the message cannot be
delivered to a ground system.
2 - LINE SELECT BUTTONS
− − There are five line selection buttons on each side of the Control
Display Unit (CDU) that provide selection of submodes within
major modes when in an indexed display.
3 - SEND PROMPT
− When the Send prompt is pressed, the message goes into
queue for transmission and the status of the message appears
above the SEND prompt. The message status are:
− QUEUED - when the message is in the log.
− SENDING - when the message is being sent.
− SENT - when the message has been sent.
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