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between the DMU data transmitter and the VHF voice transmitter.
During power up, the ASU defaults to the voice transmitter.
Pressing the AFIS annunciator on the instrument panel switches the
transmit side of the antenna to the DMU data transmitter. Pressing
the annunciator again or pressing the "push to talk" button on the
VHF communications radio switches the transmit side of the antenna
back to the voice transmitter.
Global Data Transfer Unit
If the operator chooses to use Global Flight Plan Data disks, a
Global DTU must be installed. This DTU is not the same one used
by the FMS for Jeppesen and Pilot defined data loading.
Appendix A
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DISPLAYS
AFIS is implemented in the FMS as a feature of the flight planning
function (FPL). The AFIS menu is available as a line select key
option on the FPL page. Access is also available from the Message
page, an option which makes it more convenient to get to the AFIS
function on receipt of a message.
There are two basic functions in AFIS:
• Messaging - The creation and receipt of messages for/from
other AFIS customers or ground facilities. The messages are
passed through the ACARS data link to/from the Global Data
Center and forwarded. Messages from an aircraft must be
flight related; this is a restriction on ACARS data.
• Weather reporting - The display of weather data. AFIS can
display Terminal weather for up to five airports at a time
(including sequence reports, forecasts, NOTAMS, and
PIREPS), Winds aloft for up to five reporting locations at a
time, and SIGMETs.
AFIS Access
The AFIS MENU Page is accessed either from the MESSAGE page
or DATA 1/5 page.
NOTE: • The AFIS prompt on the MESSAGE page will be blanked
during a disk load or save operation which was initiated
from the Disk Menu page.
• The AFIS prompt will be blanked if the MESSAGE page
is accessed prior to completion of required entries on the
INITIALIZATION page.
Appendix A
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AFIS Menu Page
This page allows the selection of each of the AFIS functions.
CREATE MSG [1L] - For creating the text of a message and having
it transmitted.
READ MSG [2L] - To display the text of a received message.
TERM WX [3L] - For requesting and reading terminal weather
reports, including sequence reports, terminal forecasts, NOTAMS
and PIREPS.
SIGMETS [4L] - For requesting and reading pertinent SIGMET
reports.
WINDS [5L] - For requesting and reading winds aloft reports.
FPL [1R] - To display the AFIS FPL page.
AFIS OPTIONS [4R] - To display AFIS OPTIONS page.
RETURN [5R] - The display will return to the FPL page.
Appendix A
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Messages
CREATE MESSAGE Page
This page is where the header information (From, To, number) is
entered and the status of the message text is displayed.
TO [1L] - The intended destination of the message to be sent. Up to
16 characters may be entered.
FR [2L] - The origin of the message. Up to 16 characters may be
entered.
# [3L] - Telephone number of intended message destination. Up to
17 characters may be entered.
EDIT MSG TEXT [4L] - Pressing the [EDIT MSG TEXT] line select
key will access the EDIT MSG TEXT page. To the right of "EDIT
MSG TEXT" is a status field which will display one of the following:
• ENTERED - A message has been entered on the Edit
Message Text page and has not been sent.
• SENDING - A message is in the process of being transmitted.
• SENT - A message has been entered on the Edit Message
Text page and has been transmitted.
• CLEARED - The message text page has been cleared
(erased).
XMIT MESSAGE / NO COMM [5L] - "XMIT MESSAGE" will be
available if a message has been entered on the EDIT MSG TEXT
page and it has not yet been transmitted. After the message is
transmitted this field will be blank. "NO COMM" will be displayed if
communication is not possible.
RETURN [5R] - This will return the display to the AFIS MENU page
Appendix A
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EDIT MESSAGE TEXT Page
This page is for entering and editing the text of a flight related
message which is to be sent via AFIS on ground-air data link.
The ± key is used as a space bar to separate words. Note that there
is no period symbol available to separate sentences; however, some
extra spaces or the typing of an identifying abbreviation such as
"STP" (stop) or "PD" (period) may be used instead for enhanced
clarity. Each line accepts up to 20 characters. Pressing the ENTER
　
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