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160 Notification to the avionics that the
specified data authority is the next
data authority. If no data authority is
specified, this indicates that any
previously specified next data
authority is no longer valid.
NEXT DATA AUTHORITY
(facility)
L N N
161 Notification to the avionics that the
data link connection with the current
data authority is being terminated.
END SERVICE L N N
162 Notification that the ground system
does not support this message.
SERVICE UNAVAILABLE L L N
234 Notification that the ground system
does not have a flight plan for that
aircraft.
FLIGHT PLAN NOT HELD L L N
163 Notification to the pilot of an ATSU
identifier.
(facility designation) L N N
Message intent/use Message element URG ALRT RESP
Appendix 5 A5-17
1/11/01
Table A5-12. Additional messages (uplink)
227 Confirmation to the aircraft system
that the ground system has received
the message to which the logical
acknowledgement refers and found it
acceptable for display to the
responsible person.
LOGICAL
ACKNOWLEDGEMENT
N M N
233 Notification to the pilot that
messages sent requiring a logical
acknowledgement will not be
accepted by this ground system.
USE OF LOGICAL
ACKNOWLEDGEMENT
PROHIBITED
N M N
Message intent/use Message element URG ALRT RESP
164 The associated instruction may be
complied with at any future time.
WHEN READY L N N
230 The associated instruction is to be
complied with immediately.
IMMEDIATELY D H N
165 Used to link two messages,
indicating the proper order of
execution of clearances/instructions.
THEN L N N
166 The associated instruction is issued
due to traffic considerations.
DUE TO (traffic type)
TRAFFIC
L N N
167 The associated instruction is issued
due to airspace restrictions.
DUE TO AIRSPACE
RESTRICTION
L N N
168 The indicated communication should
be ignored.
DISREGARD U M R
176 Notification that the pilot is
responsible for maintaining
separation from other traffic and is
also responsible for maintaining
visual meteorological conditions.
MAINTAIN OWN
SEPARATION AND VMC
N M W/U
177 Used in conjunction with a
clearance/instruction to indicate that
the pilot may execute when prepared
to do so.
AT PILOTS DISCRETION L L N
178 (reserved) L L Y
169 (free text) N L R
170 (free text) D H R
183 (free text) N M N
187 (free text) L N N
194 (free text) N L Y
195 (free text) L L R
196 (free text) N M W/U
197 (free text) U M W/U
198 (free text) D H W/U
Message intent/use Message element URG ALRT RESP
A5-18 Air Traffic Management (PANS-ATM)
1/11/01
Note.— Free text message elements have no associated message intent. The capability to send a free text message with any of
the attribute combinations already used in the message set has been provided for in the technical requirements of the ATN
(Annex 10, Volume III, Part I, Chapter 3).
2. Downlink messages
Table A5-13. Responses (downlink)
Table A5-14. Vertical requests (downlink)
199 (free text) N L N
201 Not used L L N
202 Not used L L N
203 (free text) N M R
204 (free text) N M Y
205 (free text) N M A/N
206 (free text) L N Y
207 (free text) L L Y
208 (free text) L L N
Message intent/use Message element URG ALRT RESP
0 The instruction is understood and
will be complied with.
WILCO N M N
1 The instruction cannot be complied
with.
UNABLE N M N
2 Wait for a reply. STANDBY N M N
3 Message received and understood. ROGER N M N
4 Yes. AFFIRM N M N
5 No. NEGATIVE N M N
Message intent/use Message element URG ALRT RESP
6 Request to fly at the specified level. REQUEST (level) N L Y
7 Request to fly at a level within the
specified vertical range.
REQUEST BLOCK (level)
TO (level)
N L Y
8 Request to cruise climb to the
specified level.
REQUEST CRUISE CLIMB
TO (level)
N L Y
9 Request to climb to the specified
level.
REQUEST CLIMB TO
(level)
N L Y
10 Request to descend to the specified
level.
REQUEST DESCENT TO
(level)
N L Y
11 Request that at the specified position
a climb to the specified level be
approved.
AT (position) REQUEST
CLIMB TO (level)
N L Y
Message intent/use Message element URG ALRT RESP
Appendix 5 A5-19
1/11/01
Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block
　
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