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communicates via voice, the response should be via voice.
8.2.9.1.3 PANS.- If a CPDLC message that requires an
operational response is subsequently negotiated via voice, an
appropriate CPDLC message closure response shall be sent, to
ensure proper synchronization of the CPDLC dialogue.
8.2.8.4 The pilot shall be able to identify the air traffic
8.2.9.2 The composition of a CPDLC message shall not
control unit providing the air traffic control service at any time exceed five message elements, only two of which may contain
while the service is being provided. the route clearance variable.
8.2.8.5 When the airborne system detects that CPDLC is 8.2.9.2.1 PANS.- The use of long messages or messages
available for operational use, it shall send the CPDLC with multiple clearance elements or messages with a
downlinlc message element CURRENT DATA AUTHORITY, combination of clearances and information should be avoided
where possible.
8.2.8.6 Airborne-initiated CPDLC
8.2.8.6.1 PANS.- When an ATC unit receives an
unexpected request ,for CPDLC ,from an aircruft, the
circumstances leading to the request shall he ohtainedfrom the
aircrqft to determine,further action.
8.2.8.6.2 PANS.- When the ATC unit rejects a request
for CPDLC, it shall provide the pilot with the reason ,for the
rejection using an appropriate CPDLC message.
8.2.8.7 ATC unit-initiated CPDLC
8.2.8.7.1 An ATC unit shall only establish CPDLC with
an aircraft if the aircraft has no CPDLC link established, or
when authorized by the ATC unit currently having CPDLC
established with the aircraft.
8.2.8.7.2 When a request for CPDLC is rejected by an
aircraft, the reason for the rejection shall be provided using
CPDLC downlink message element NOT CURRENT DATA
AUTHORITY or message element NOT AUTHORIZED
NEXT DATA AUTHORITY, as appropriate. Local procedures
shall dictate whether the reason for rejection is presented to the
N o t e . Guidance material on the development of local
operating procedures and CPDLC good operating technique
can he,found in the Human Factors Guidelines for Air Traffic
Management (ATM) Systems (Doc 9758).
8.2.9.3 CPDLC ground systems and airborne systems
shall be capable of using the CPDLC message urgency and
alert attributes to alter presentations in order to draw attention
to higher priority messages.
N o t e . Message attributes dictate certain message
handling requirements ,for the CPDLC user receiving a
message. Each CPDLC message has three attributes: urgency,
alert and response attributes. When a message contains
multiple message elements, the highest precedence message
element attribute type becomes the attribute type,for the entire
message.
8.2.9.3.1 The urgency attribute shall delineate the queuing
requirements for received messages that are displayed to the
end-user. Urgency types are presented in Table 8-1.
8.2.9.3.2 The alert attribute shall delineate the type of
alerting required upon message receipt. Alert types are
presented in Table 8-2.
Chapter 8 Annex 10 - Aeronautical Telecommunications
8.2.9.3.3 The response attribute shall delineate valid N o t e . For example, a multi-element downlink message
responses for a given message element. Response types are containing the indicated message elements:
presented in Table 8-3 for uplink messages and Table 8-4 for
downlink messages. MAINTAINING FL3 10
REQUEST CLEARANCE YQM YYG YYT YQX TRACK
8.2.9.3.3.1 PANS.- When a multi-element message X EINN FPL EDDF
requires a response, and the response is in the form of a single REQUEST CLIMB FL350
message element, the response shall apply to all message WE CAN ACCEPT FL390 AT 11392
elements. REQUEST MACH .84
N o t e . For example, a multi-element message containing
CLIMB TO FL310 MAINTAIN MACH.84, a WILCO could he responded to with
response applies to, and indicates compliance with, both
elements of the message. CLEARED YQM W G W T YQX TRACK X EINN FPL
EDDF
8.2.9.3.3.2 PANS.- When a single message element CLIMB TO FL350
clearance or any part of a multi-element clearance message REPORT REACHING
cannot he complied with, the pilot shall send an UNABLE CROSS 52N 30W AT OR AFTER 11502
response ,for the whole message. NO SPEED RESTRICTION.
8.2.9.3.3.3 PANS.- The controller shall respond with an
UNABLE message that applies to all elements of the request 8.2.9.3.3.6 PANS.- When a CPDLC message contains
when no elementb) of a single or multi-element clearance more than one message element and the response attrihute,for
request can he approved. The current clearance(s) shall not he the message is I: when utilized, the single response message
shall contain the corresponding number of replies in the same
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