737 Flight Crew Operations Manual
Flight Management, Navigation -
ATC Data Link
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11.34.74 D6-27370-866-EGP
DOWNLINK MESSAGE
STATUS
DESCRIPTION
PENDING A downlink message was sent to the ground
facility, but the ground facility has not returned
Logical Acknowledgment (LACK) of the
receipt of the message.
OPEN A downlink message has an acknowledgement
response from the ground but no direct
response has been received.
CLOSED The ground facility has responded to a
downlink message or the message requires no
response.
TIMEOUT A downlink message was not responded to in
time. This is due to the Logical
Acknowledgement (LACK) of the message not
being received in time or the Air Traffic
Control (ATC) controller’s response not being
received in time.
ERROR A downlink message caused an error message
to be generated from the ground.
September 15, 2016
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