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SQUAWKING 7500 U H N
57 Notification of fuel remaining and
number of persons on board.
(remaining fuel) OF FUEL
REMAINING AND (persons
on board) PERSONS ON
BOARD
U H Y
58 Notification that the pilot wishes to
cancel the emergency condition.
CANCEL EMERGENCY U M Y
59 Notification that the aircraft is
diverting to the specified position via
the specified route due to an urgent
need.
DIVERTING TO (position)
VIA (route clearance)
U H Y
60 Notification that the aircraft is
deviating the specified distance in
the specified direction off the cleared
route and maintaining a parallel track
due to an urgent need.
OFFSETTING (specified
distance) (direction) OF
ROUTE
U H Y
61 Notification that the aircraft is
descending to the specified level due
to an urgent need.
DESCENDING TO (level) U H Y
80 Notification that the aircraft is
deviating up to the specified distance
from the cleared route in the
specified direction due to an urgent
need.
DEVIATING UP TO
(specified distance)
(direction) OF ROUTE
U H Y
Message intent/use Message element URG ALRT RESP
62 A system-generated message that the
avionics has detected an error.
ERROR (error information) U L N
63 A system-generated denial to any
CPDLC message sent from a ground
facility that is not the current data
authority.
NOT CURRENT DATA
AUTHORITY
L L N
99 A system-generated message to
inform a ground facility that it is now
the current data authority.
CURRENT DATA
AUTHORITY
L L N
A5-24 Air Traffic Management (PANS-ATM)
1/11/01
Table A5-23. Additional messages (downlink)
64 Notification to the ground system
that the specified ATSU is the
current data authority.
(facility designation) L L N
107 A system-generated message sent to
a ground system that tries to connect
to an aircraft when a current data
authority has not designated the
ground system as the NDA.
NOT AUTHORIZED NEXT
DATA AUTHORITY
L L N
73 A system-generated message
indicating the software version
number.
(version number) L L N
100 Confirmation to the ground system
that the aircraft 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
Message intent/use Message element URG ALRT RESP
65 Used to explain reasons for pilot’s
message.
DUE TO WEATHER L L N
66 Used to explain reasons for pilot’s
message.
DUE TO AIRCRAFT
PERFORMANCE
L L N
74 States a desire by the pilot to provide
his/her own separation and remain in
VMC.
REQUEST TO MAINTAIN
OWN SEPARATION AND
VMC
L L Y
75 Used in conjunction with another
message to indicate that the pilot
wishes to execute request when the
pilot is prepared to do so.
AT PILOTS DISCRETION L L N
101 Allows the pilot to indicate a desire
for termination of CPDLC service
with the current data authority.
REQUEST END OF
SERVICE
L L Y
103 Allows the pilot to indicate that he/she
has cancelled IFR flight plan.
CANCELLING IFR N L Y
108 Notification that de-icing action has
been completed.
DE-ICING COMPLETE L L N
67 (free text) N L N
68 (free text) D H Y
90 (free text) N M N
91 (free text) N L Y
92 (free text) L L Y
93 (free text) U H N
94 (free text) D H N
Message intent/use Message element URG ALRT RESP
Appendix 5 A5-25
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).
Table A5-24. Negotiation responses (downlink)
Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block
level.
— END —
95 (free text) U M N
96 (free text) U L N
97 (free text) L L N
98 (free text) N N N
Message intent/use Message element URG ALRT RESP
81 We can accept the specified level at
the specified time.
WE CAN ACCEPT (level)
AT (time)
L L N
82 We cannot accept the specified level. WE CANNOT ACCEPT
(level)
L L N
83 We can accept the specified speed at
　
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