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and keyboards are drawn on the display. Empty data fields shall be dashed.
Data required for operation but not provided will be indicated by slashes.
The Management Unit (MU) gathers and stores data from the aircraft, receives
uplink data messages and controls the downlink of data messages through the
VHF transceiver.
DFDMU (Digital Flight Data Management Unit) is used to monitor over 700
parameters and streams this information to the Flight Data Recorder. Some
event initiated maintenance reports are automatically transmitted, including
engine reports.
When the ACARS system is selected and the VHF transceiver is in the DATA
mode, the pilot can display, printout and downlink DATA mode messages.
COMMUNICATIONS
Sec. 6.5 Page 48 737
Rev. 11/15/02 #41 Continental Flight Manual
Each downlink data message, whether pilot initiated on the IDU or MU
initiated, requires a ground radio station to acknowledge the message. If an
acknowledgment is not received, the MU re-transmits the message several
times. If the message is still not acknowledged, the pilot is informed there has
been no response to the message. High priority messages will be held in
memory.
Each uplink message, initiated by the Continental ground computer, requires the
MU on the aircraft to acknowledge the message. The pilot is notified by the
display of the MSG> advisory.
Because the VHF frequency employed in the air-ground link is not universal, as
the aircraft flies from one jurisdiction to another, the ACARS frequency can
change.
VOICE mode can be selected on the IDU by the pilot or by a ground station VOICE
mode command message. When in VOICE mode, the transceiver is tuned by the
MU to a frequency entered on the IDU or by the flight deck control head. DATA
mode can only be re-selected on the IDU by the pilot.
ACARS ROAD MAP
COMMUNICATIONS
737 Sec. 6.5 Page 49
Flight Manual Continental Rev. 11/15/02 #41
Controls And Indicators
Index
No.
Control or
Indicator
Description Function
1 Display/touch
switch panel
Display:
Indicates selections of functions using lines of text,
prompts, graphic symbols and/or reverse video for
display and touch switch panel operation. Also
indicates cursor underlined fields for data entry.
Displays dynamic data using lower case letters as
follows:
h is hours
m is minutes
s following mm is seconds
s preceding n is sign + or -
n is any numeric character
a is any alphabetic character
x is any ASCII character (some restrictions)
Touch Switch Panel:
When finger touched and released at highlighted
function, activates that function.
2 <ACARS
<DFDAU
Touch switch When touched, selects ACARS or DFDAU menu for
display.
3 ABCDE
123
Touch keypad When touched, a character is entered above the
underlined cursor and the underlined cursor moves
to the next space for character entry.
4 1/n Touch switch When touched, indexes the display to the next page
of a multi-page display. If the last page is on
display, returns to the first page.
5 < > Touch switches When left or right arrow is touched, moves the
underlined cursor to the left or right, respectively.
6 . Touch switch When touched, enters a period or decimal point.
COMMUNICATIONS
Sec. 6.5 Page 50 737
Rev. 11/15/02 #41 Continental Flight Manual
Index
No.
Control or
Indicator
Description Function
7 / Touch switch If touched when the cursor is in a multiple
parameter data field containing a slash, moves the
cursor to the right of the slash in the data field.
8 Cabin brightness
sensor
Senses the brightness of light in the cabin for IDU
automatic adjustment of display light intensity.
9 SEND* Touch switch When touched, SEND* prepares and sends a
downlink transmission of the indicated message and
returns to the menu from which the display was
called.
10 PRINT* Touch switch When touched, PRINT* sends the displayed
message or report to the printer and leaves the
display was called.
11-24 XXXXXX Touch switches Advisories. Refer to the Advisory Messages.
25 SPACE Touch switch When touched while entering a free text message,
moves the cursor one space.
26 ******* Indicator After a downlink transmission has been sent, using
the SEND* touch switch, the status of the displayed
message is indicated in the line. The status
indications for the displayed message are:
QUEUED - The message on this page is in queue to
be sent.
SENDING - The message on this page has been
transmitted.
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