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W/U Yes WILCO, UNABLE, STANDBY,
NOT CURRENT DATA AUTHORITY,
NOT AUTHORIZED NEXT DATA
AUTHORITY,
LOGICAL ACKNOWLEDGMENT (only if
required),
ERROR
1
A/N Yes AFFIRM, NEGATIVE, STANDBY,
NOT CURRENT DATA AUTHORITY,
NOT AUTHORIZED NEXT DATA
AUTHORITY,
LOGICAL ACKNOWLEDGMENT (only if
required),
ERROR
2
R Yes ROGER, UNABLE, STANDBY,
NOT CURRENT DATA AUTHORITY,
NOT AUTHORIZED NEXT DATA
AUTHORITY,
LOGICAL ACKNOWLEDGMENT
(only if required),
ERROR
3
Y Yes Any CPDLC downlink message,
LOGICAL ACKNOWLEDGEMENT (only if
required)
4
N No, unless logical
acknowledgement
required
LOGICAL ACKNOWLEDGMENT (only if
required),
NOT CURRENT DATA AUTHORITY,
NOT AUTHORIZED NEXT DATA
AUTHORITY,
ERROR
5
Type Response required Valid responses Precedence
Y Yes Any CPDLC uplink message,
LOGICAL ACKNOWLEDGEMENT (only if
required)
1
N No, unless logical
acknowledgement
required
LOGICAL ACKNOWLEDGMENT (only if
required),
SERVICE UNAVAILABLE,
FLIGHT PLAN NOT HELD,
ERROR
2
Chapter 14. Controller-Pilot Data Link Communications (CPDLC) 14-5
1/11/01
14.3.4 Free text messages
The use of free text messages by controllers or pilots, other
than pre-formatted free text messages, should be avoided.
Note 1.— Whilst it is recognized that non-routine and
emergency situations may necessitate use of free text,
particularly when voice communications have failed, the
avoidance of utilizing free text messages is intended to reduce
the possibility of misinterpretation and ambiguity.
Note 2.— Provisions concerning the use of pre-formatted
free text messages are contained in Annex 10, Volume II,
Chapter 4.
14.3.5 Emergencies, hazards and equipment
failure procedures
14.3.5.1 When a CPDLC emergency message is
received, the controller shall acknowledge receipt of the
message by the most efficient means available.
14.3.5.2 When responding via CPDLC to a report
indicating unlawful interference, uplink message ROGER
7500 shall be used.
14.3.5.3 When responding via CPDLC to all other
emergency or urgency messages, uplink message ROGER
shall be used.
14.3.5.4 When a CPDLC message requires a logical
acknowledgment and/or an operational response, and such a
response is not received, the pilot or controller, as appropriate
shall be alerted.
14.3.6 Failure of CPDLC
14.3.6.1 The controller and pilot shall be alerted to the
failure of CPDLC as soon as the failure has been detected.
14.3.6.2 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.
14.3.6.3 Controllers having a requirement to transmit
information concerning a complete CPDLC ground system
failure to all stations likely to intercept, should preface such
transmission by the general call ALL STATIONS CPDLC
FAILURE, followed by the identification of the calling station.
Note.— No reply is expected to such general calls unless
individual stations are subsequently called to acknowledge
receipt.
14.3.6.4 When CPDLC fails and communications revert
to voice, all CPDLC messages outstanding should be
considered not delivered and the entire dialogue involving the
messages outstanding should be recommenced by voice.
14.3.6.5 When CPDLC fails but is restored prior to a
need to revert to voice communications, all messages outstanding
should be considered not delivered and the entire
dialogue involving the messages outstanding should be
recommenced via CPDLC.
14.3.7 Intentional shutdown of CPDLC
14.3.7.1 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.
14.3.7.2 Aircraft currently in communication with the
ATC unit shall be informed by voice or CPDLC of any
imminent loss of CPDLC service.
14.3.7.3 The controller and pilot shall be provided with
the capability to abort CPDLC.
14.3.8 Testing of CPDLC
Where the testing of CPDLC with an aircraft could affect the
air traffic services being provided to the aircraft, coordination
shall be effected prior to such testing.
PANS-ATM 15-1 1/11/01
CHAPTER 15. PROCEDURES RELATED TO EMERGENCIES,
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