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level.
31 Instruction that a climb to a level
within the vertical range defined is to
commence.
CLIMB TO AND
MAINTAIN BLOCK (level)
TO (level)
N M W/U
32 Instruction that a descent to a level
within the vertical range defined is to
commence.
DESCEND TO AND
MAINTAIN BLOCK (level)
TO (level)
N M W/U
34 Instruction that a cruise climb is to
commence and continue until the
specified level is reached.
CRUISE CLIMB TO (level) N M W/U
35 Instruction that a cruise climb can
commence once above the specified
level.
CRUISE CLIMB ABOVE
(level)
N M W/U
219 Instruction to stop the climb below the
previously assigned level.
STOP CLIMB AT (level) U M W/U
220 Instruction to stop the descent above
the previously assigned level.
STOP DESCENT AT (level) U M W/U
36 Instruction that the climb to the
specified level should be made at the
aircraft’s best rate.
EXPEDITE CLIMB TO
(level)
U M W/U
37 Instruction that the descent to the
specified level should be made at the
aircraft’s best rate.
EXPEDITE DESCENT TO
(level)
U M W/U
38 Urgent instruction to immediately
climb to the specified level.
IMMEDIATELY CLIMB TO
(level)
D H W/U
39 Urgent instruction to immediately
descend to the specified level.
IMMEDIATELY DESCEND
TO (level)
D H W/U
40 (reserved) L L Y
41 (reserved) L L Y
171 Instruction to climb at not less than the
specified rate.
CLIMB AT (vertical rate)
MINIMUM
N M W/U
172 Instruction to climb at not above the
specified rate.
CLIMB AT (vertical rate)
MAXIMUM
N M W/U
173 Instruction to descend at not less than
the specified rate.
DESCEND AT (vertical rate)
MINIMUM
N M W/U
174 Instruction to descend at not above the
specified rate.
DESCEND AT (vertical rate)
MAXIMUM
N M W/U
33 (reserved) L L Y
Message intent/use Message element URG ALRT RESP
A5-6 Air Traffic Management (PANS-ATM)
1/11/01
Table A5-3. Crossing constraints (uplink)
Message intent/use Message element URG ALRT RESP
42 Notification that a level change
instruction should be expected which
will require the specified position to
be crossed at the specified level.
EXPECT TO CROSS
(position) AT (level)
L L R
43 Notification that a level change
instruction should be expected which
will require the specified position to
be crossed at or above the specified
level.
EXPECT TO CROSS
(position) AT OR ABOVE
(level)
L L R
44 Notification that a level change
instruction should be expected which
will require the specified position to
be crossed at or below the specified
level.
EXPECT TO CROSS
(position) AT OR BELOW
(level)
L L R
45 Notification that a level change
instruction should be expected which
will require the specified position to
be crossed at the specified level
which is to be maintained
subsequently.
EXPECT TO CROSS
(position) AT AND
MAINTAIN (level)
L L R
46 Instruction that the specified position
is to be crossed at the specified level.
This may require the aircraft to
modify its climb or descent profile.
CROSS (position) AT (level) N M W/U
47 Instruction that the specified position
is to be crossed at or above the
specified level.
CROSS (position) AT OR
ABOVE (level)
N M W/U
48 Instruction that the specified position
is to be crossed at or below the
specified level.
CROSS (position) AT OR
BELOW (level)
N M W/U
49 Instruction that the specified position
is to be crossed at the specified level
and that level is to be maintained
when reached.
CROSS (position) AT AND
MAINTAIN (level)
N M W/U
50 Instruction that the specified position
is to be crossed at a level between the
specified levels.
CROSS (position)
BETWEEN (level) AND
(level)
N M W/U
51 Instruction that the specified position
is to be crossed at the specified time.
CROSS (position) AT (time) N M W/U
52 Instruction that the specified position
is to be crossed at or before the
specified time.
CROSS (position) AT OR
BEFORE (time)
N M W/U
53 Instruction that the specified position
is to be crossed at or after the
specified time.
CROSS (position) AT OR
AFTER (time)
N M W/U
54 Instruction that the specified position
　
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