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where the CPDLC message set contained in the PANS-ATM Recommendation.- ATC units utilizing a CPDLC message
does not provide for specific requirements. In such cases, a list contained in the PANS-ATM should display the associated text
of pre-formatted free text messages shall be established by the pertaining to that message as presented in the PANS-ATM,
appropriate ATS authority, in consultation with operators and Appendix 5.
other ATS authorities that may be concerned.
8.2.9.5.3 Information concerning CPDLC message
8.2.11 Free text messages
- -
element subsets utilized and, if applicable, any additional pre- PANS.- The use of,free text messages by controllers or
free text be in pilots, other than pre-formatted,free text messages referred to
aeronautical information publications. in paragraph 8.2.9.5.2, should he avoided.
8.2.9.6 Tmnsfer of CPDLC
N o t e . Whilst it is recognized that non-routine and
emergency situations may necessitate the use of free text,
particularly when voice communication has failed, the
N o t e . Detai2s On tran'rfer can be .found in the avoidance qf utilizing,free text messages is intended to reduce
Manual of Air Traffic Services Data Link Applications the misinterpretation and
(Doc 9694).
8.2.9.6.1 PANS.- When CPDLC is transferred, the
transfer of voice communications and CPDLC shall commence
concurrently.
8.2.9.6.2 PANS.- When an aircvqft 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.
8.2.9.6.3 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.
8.2.12 Emergencies, hazards and equipment
failure procedures
8.2.12.1 PANS.- When a CPDLC emergency message is
received, the controller shall acknowledge receipt of the
message by the most eficient meam available.
8.2.12.2 PANS.- When responding via CPDLC to a
report indicating unlawful interference, uplink message
ROGER 7500 shall be used.
8.2.12.3 PANS.- When responding via CPDLC to all
other emergency or urgency messages, uplink message
ROGER shall be used.
Annex 10 - Aeronautical Telecommunications Volume 11
8.2.12.4 When a CPDLC message requires a logical
aclcnowledgement and/or an operational response, and such a
response is not received, the pilot or controller, as appropriate,
shall be alerted.
8.2.12.5 Failure of CPDLC
8.2.12.5.1 Recommendation.- A CPDLC failure should
he detected in a timely mannex
8.2.12.5.2 The controller and pilot shall be alerted to a
failure of CPDLC as soon as a failure has been detected.
8.2.12.5.3 PANS.- When a controller or pilot is alerted
that CPDLC has ,failed, and the controller or pilot needs to
communicate prior to CPDLC being restored, the controller or
pilot should revert to voice, if possible, and preface the
information with the phrase:
CPDLC FAILURE.
8.2.12.5.4 PANS.- Contvollers having a requirement to
tmnsmit information concerning a complete CPDLC ground
system ,failure to all statiom likely to intercept should preface
such a transmission by the general call ALL STATIONS CPDLC
FAILURE, ,followed by the identification of the calling station.
N o t e . No reply is expected to such general calls unless
individual stations are subsequently called to acknowledge
receipt.
8.2.12.5.5 PANS.- When CPDLC,fails and communications
revert to voice, all CPDLC messages outstanding
should he considered not delivered and the entire dialogue
involving the messages outstanding should he recommenced by
voice.
8.2.12.5.6 PANS.- When CPDLC ,fails hut is restored
prior to a need to revert to voice communications, all
messages outstanding should he considered not delivered and
the entire dialogue involving the messages outstanding should
he recommenced via CPDLC.
8.2.12.6 Intentional shutdown of CPDLC
8.2.12.6.1 When a system shutdown of the
communications network or the CPDLC ground system is
planned, a NOTAM shall be published to inform all affected
parties of the shutdown period and if necessary, the details of
the voice communication frequencies to be used.
8.2.12.6.2 Aircraft currently in communication with the
ATC unit shall be informed by voice or CPDLC of any
imminent loss of CPDLC service.
8.2.12.6.3 The controller and pilot shall be provided with
the capability to abort CPDLC.
8.2.13 Where the testing of CPDLC with an aircraft could
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