737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
ATC Data Link
11.34.46
MN-FLT-OH-201
1
LOGON TO
Entry of a four to eight characters ATC center identifier causes the FMC to use the
ATC database to determine if the entered center is an Aeronautical
Telecommunications Network (ATN) center.
• If an ATC database is not installed and more than a 4-character long
station name is entered, INVALID ENTRY is displayed in the
scratchpad.
• If an ATC database is installed and the entered 4-character center is not
in the ATC database, the FMC assumes the entered center is a FANS
center.
• If the entered center exists in the ATC database and FANS ON/OFF is
selected OFF on the ATC Log on/Status page, its associated ground
address is used for the ATN logon downlink.
If the data link status is READY, a valid entry will be four alpha characters.
• The FMC assumes the entered center is a FANS center.
When a FANS center is entered with a flight number displayed in field 2L along
with a tail number in field 3L the result will be a display of the logon SEND
prompt in 6R, if the data link status is READY or ATN READY or ATN ONLY.
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March 1, 2021
