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reached a level within the specified
vertical range.
REACHING BLOCK (level)
TO (level)
N L N
38 Read-back of the assigned level. ASSIGNED LEVEL (level) N M N
77 Read-back of the assigned vertical
range.
ASSIGNED BLOCK (level)
TO (level)
N M N
39 Read-back of the assigned speed. ASSIGNED SPEED (speed) N M N
40 Read-back of the assigned route. ASSIGNED ROUTE (route
clearance)
N M N
41 The aircraft has regained the cleared
route.
BACK ON ROUTE N M N
42 The next waypoint is the specified
position.
NEXT WAYPOINT
(position)
N L N
43 The ETA at the next waypoint is as
specified.
NEXT WAYPOINT ETA
(time)
N L N
44 The next but one waypoint is the
specified position.
ENSUING WAYPOINT
(position)
N L N
45 Clarification of previously reported
waypoint passage.
REPORTED WAYPOINT
(position)
N L N
46 Clarification of time over previously
reported waypoint.
REPORTED WAYPOINT
(time)
N L N
47 The specified (SSR) code has been
selected.
SQUAWKING (code) N L N
48 Position report. POSITION REPORT
(position report)
N M N
79 The code of the latest ATIS received
is as specified.
ATIS (atis code) N L N
89 The specified ATS unit is being
monitored on the specified
frequency.
MONITORING (unit name)
(frequency)
U M N
102 Used to report that an aircraft has
landed.
LANDING REPORT N N N
104 Notification of estimated time of
arrival at the specified position.
ETA (position) (time) L L N
105 Notification of the alternate
aerodrome for landing.
ALTERNATE
AERODROME (airport)
L L N
106 Notification of the preferred level. PREFERRED LEVEL (level) L L N
109 Notification of the preferred time to
commence descent for approach.
TOP OF DESCENT (time) L L N
Message intent/use Message element URG ALRT RESP
A5-22 Air Traffic Management (PANS-ATM)
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
level.
Table A5-20. Negotiation requests (downlink)
Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block
level.
110 Notification of the preferred position
to commence descent for approach.
TOP OF DESCENT
(position)
L L N
111 Notification of the preferred time and
position to commence descent for
approach.
TOP OF DESCENT (time)
(position)
L L N
Message intent/use Message element URG ALRT RESP
49 Request for the earliest time at which
a clearance to the specified speed can
be expected.
WHEN CAN WE EXPECT
(speed)
L L Y
50 Request for the earliest time at which
a clearance to a speed within the
specified range can be expected.
WHEN CAN WE EXPECT
(speed) TO (speed)
L L Y
51 Request for the earliest time at which
a clearance to regain the planned
route can be expected.
WHEN CAN WE EXPECT
BACK ON ROUTE
L L Y
52 Request for the earliest time at which
a clearance to descend can be
expected.
WHEN CAN WE EXPECT
LOWER LEVEL
L L Y
53 Request for the earliest time at which
a clearance to climb can be expected.
WHEN CAN WE EXPECT
HIGHER LEVEL
L L Y
54 Request for the earliest time at which
a clearance to cruise climb to the
specified level can be expected.
WHEN CAN WE EXPECT
CRUISE CLIMB TO (level)
L L Y
87 Request for the earliest time at which
a clearance to climb to the specified
level can be expected.
WHEN CAN WE EXPECT
CLIMB TO (level)
L L Y
88 Request for the earliest time at which
a clearance to descend to the
specified level can be expected.
WHEN CAN WE EXPECT
DESCENT TO (level)
L L Y
Message intent/use Message element URG ALRT RESP
Appendix 5 A5-23
1/11/01
Table A5-21. Emergency and urgent messages (downlink)
Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block
level.
Table A5-22. System management messages (downlink)
Message intent/use Message element URG ALRT RESP
55 Urgency prefix. PAN PAN PAN U H Y
56 Distress prefix. MAYDAY MAYDAY
MAYDAY
D H Y
112 Indicates specifically that the aircraft
is being subjected to unlawful
interference.
　
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