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types are presented in Table 14-1.
14.3.2.2 ALERT
The alert attribute delineates the type of alerting required upon
message receipt. Alert types are presented in Table 14-2.
Table 14-1. Urgency attribute
(uplink and downlink)
Table 14-2. Alert attribute
(uplink and downlink)
Type Description Precedence
D Distress 1
U Urgent 2
N Normal 3
L Low 4
Type Description Precedence
H High 1
M Medium 2
L Low 3
N No alerting required 4
Chapter 14. Controller-Pilot Data Link Communications (CPDLC) 14-3
1/11/01
14.3.2.3 RESPONSE
14.3.2.3.1 The response attribute delineates valid
responses for a given message element. Response types are
presented in Table 14-3 for uplink messages and Table 14-4 for
downlink messages.
14.3.2.3.2 When a multi-element message requires a
response, and the response is in the form of a single message
element, the response shall apply to all message elements.
Note.— For example, given a multi-element message
containing CLIMB TO FL310 MAINTAIN MACH .84, a
WILCO response applies to, and indicates compliance with,
both elements of the message.
14.3.2.3.3 When a single message element clearance or
any part of a multi-element clearance message cannot be
complied with, the pilot shall send an UNABLE response for
the whole message.
14.3.2.3.4 The controller shall respond with an UNABLE
message that applies to all elements of the request when no
element(s) of a single or multi-element clearance request can
be approved. The current clearance(s) shall not be restated.
14.3.2.3.5 When all elements of a single or multielement
clearance request can be accommodated, the
controller shall respond with clearances corresponding to each
element of the request. This response should be a single uplink
message.
14.3.2.3.6 When a controller can only partially
accommodate multi-element clearance requests, the requests
shall be responded to with clearances corresponding to the
parts that can be accommodated, and for the parts that cannot
be accommodated the current clearance shall be restated or an
alternative clearance shall be given.
Note.— For example, a multi-element downlink message
containing the indicated message elements:
MAINTAINING FL310
REQUEST CLEARANCE YQM YYG YYT YQX
TRACK X EINN FPL EDDF
REQUEST CLIMB FL350
WE CAN ACCEPT FL390 AT 1139Z
REQUEST MACH .84
could be responded to with
CLEARED YQM YYG YYT YQX TRACK X EINN FPL
EDDF
CLIMB TO FL350
REPORT REACHING
CROSS 52N 30W AT OR AFTER 1150Z
NO SPEED RESTRICTION
14.3.2.3.7 When a CPDLC message contains more than
one message element and the response attribute for the
message is Y, when utilized, the single response message shall
contain the corresponding number of replies and in the same
order.
Note.— For example, a multi-element uplink message
containing
CONFIRM SQUAWK
WHEN CAN YOU ACCEPT FL410
could be responded to with
SQUAWKING 5525
WE CAN ACCEPT FL410 AT 1636Z.
14.3.3 Transfer of CPDLC
Note.— Details on CPDLC transfer can be found in the
Manual of Air Traffic Services Data Link Applications (Doc
9694).
14.3.3.1 When CPDLC is transferred, the transfer of voice
communications and CPDLC shall commence concurrently.
14.3.3.2 When an aircraft is transferred from an ATC
unit where CPDLC is available to an ATC unit where CPDLC
is not available, CPDLC termination shall commence
concurrent with the transfer of voice communications.
14.3.3.3 When a transfer of CPDLC results in a change
of data authority, and there are still messages for which the
closure response has not been received (i.e. messages
outstanding), the controller transferring the CPDLC shall be
informed.
14.3.3.3.1 If the controller needs to transfer the aircraft
without replying to any downlink message(s) outstanding, the
system shall have the capability to automatically send the
appropriate closure response message(s). In such cases, the
contents of any automatically sent closure response message(s)
shall be promulgated in local instructions.
14.3.3.3.2 When the controller decides to transfer the
aircraft without receiving pilot responses to any uplink
message(s) outstanding, the controller should revert to voice
communications to clarify any ambiguity associated with the
message(s) outstanding.
14-4 Air Traffic Management (PANS-ATM)
1/11/01
Table 14-3. Response attribute (uplink)
Table 14-4. Response attribute (downlink)
Type Response required Valid responses Precedence
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