User's Guide

User Guide for the Envoy Data Link
Document Number: UG-15000 Rev. A Page 119 of 173
ID
CPDLC UM/Example
Use/Intent
DO-258A
32
DESCEND TO AND MAINTAIN
BLOCK [level] TO [level]
DESCEND TO AND MAINTAIN
BLOCK 25000FT TO 20000FT
Instruction that a descent to a level within the
vertical range defined is to commence.
33
CRUISE [level]
34
CRUISE CLIMB TO [level]
CRUISE CLIMB TO 25000FT
Instruction that a cruise climb is to commence
and continue until the specified level is reached.
35
CRUISE CLIMB ABOVE [level]
CRUISE CLIMB ABOVE 25000FT
Instruction that a cruise climb can commence
once above the specified level.
36
EXPEDITE CLIMB TO [level]
EXPEDITE CLIMB TO 25000FT
Instruction that the climb to the specified level
should be made at the aircraft’s best rate.
37
EXPEDITE DESCENT TO [level]
EXPEDITE DESCENT TO 25000FT
Instruction that the descent to the specified level
should be made at the aircraft’s best rate.
38
IMMEDIATELY CLIMB TO [level]
IMMEDIATELY CLIMB TO
25000FT
Urgent instruction to immediately climb to the
specified level.
38
ASSIGNED
ROUTE[routeClearance]
Readback of the assigned route
39
IMMEDIATELY DESCEND TO
[level]
IMMEDIATELY DESCEND TO
25000FT
Urgent instruction to immediately descend to the
specified level.
40
IMMEDIATELY STOP CLIMB AT
[altitude]
Urgent instruction to immediately stop ascent at
the specified level.
41
IMMEDIATELY STOP DESCENT
AT [altitude]
Urgent instruction to immediately stop descent at
the specified level.
42
EXPECT TO CROSS [position] AT
[level]
EXPECT TO CROSS XYZ AT
25000FT
Notification that a level change instruction should
be expected which will require the specified
position to be crossed at the specified level.
Table 4.6-8
Crossing
Constraints
43
EXPECT TO CROSS [position] AT
OR ABOVE [level]
EXPECT TO CROSS XYZ AT OR
ABOVE 25000FT
Notification that a level change instruction should
be expected which will require the specified
position to be crossed at or above the specified
level.
44
EXPECT TO CROSS [position] AT
OR BELOW [level]
EXPECT TO CROSS XYZ AT OR
BELOW 25000FT
Notification that a level change instruction should
be expected which will require the specified
position to be crossed at or below the specified
level.
45
EXPECT TO CROSS [position] AT
AND MAINTAIN [level]
EXPECT TO CROSS XYZ AT AND
MAINTAIN 25000FT
Notification that a level change instruction should
be expected which will require the specified
position to be crossed at the specified level,
which is then to be maintained.
46
CROSS [position] AT [level]
CROSS XYZ AT 25000FT
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.
47
CROSS [position] AT OR ABOVE
[level]
CROSS XYZ AT OR ABOVE
25000FT
Instruction that the specified position is to be
crossed at or above the specified level.
48
CROSS [position] AT OR BELOW
[level]
CROSS XYZ AT OR ABOVE
25000FT
Instruction that the specified position is to be
crossed at or below the specified level.
49
CROSS [position] AT AND
MAINTAIN [level]
CROSS XYZ AT AND MAINTAIN
25000FT
Instruction that the specified position is to be
crossed at the specified level and that level is to
be maintained when reached.