Operational Definition in PANS-ATM (Doc 4444)

CPDLC Message Sets
Response

Message
Element
Identifier

UM23 DESCEND TO UM23 DESCEND
AND MAINTAIN
TO (level)
(altitude)
Note - Used for a
single level

W/U

LVLU-9

Instruction that a DESCEND TO
(level)
descent to the
specified level or
vertical range is
to commence and
once reached is
to be maintained.

UM36 EXPEDITE
CLIMB TO (altitude)
Note - This message
element is equivalent
to SUPU-3 plus
LVLU-6 in Doc 4444.

W/U

LVLU-6

Instruction that a
climb to the
specified level or
vertical range is to
commence and
once reached is to
be maintained.

UM37 EXPEDITE
DESCEND TO
(altitude)

W/U

LVLU-9

Instruction that a DESCEND TO
(level)
descent to the
specified level or
vertical range is
to commence and
once reached is
to be maintained.

UM38
IMMEDIATELY
CLIMB TO (altitude)
Note - This message
element is equivalent
to EMGU-2 plus
LVLU-6 in Doc 4444.

W/U

LVLU-6

Instruction that a
climb to the
specified level or
vertical range is to
commence and
once reached is to
be maintained.

UM39
IMMEDIATELY
DESCEND TO
(altitude)
Note - This message
element is equivalent
to EMGU-2 plus
LVLU-9 in Doc 4444.

W/U

LVLU-9

Instruction that a DESCEND TO
(level)
descent to the
specified level or
vertical range is
to commence and
once reached is
to be maintained.

UM135 CONFIRM
ASSIGNED
ALTITUDE
Note - NE response
attribute

LVLU-27

Request to confirm CONFIRM
the assigned level. ASSIGNED
LEVEL

UM177 AT PILOTS
DISCRETION

NE

See Note

Request to confirm
the assigned level.

FANS 1/A

ATN B1

Message Element
Intended Use

Format for
Message Element
Display

CLIMB TO (level)

CLIMB TO (level)

NOTE-
ICAO Document 10037, Global Operational Data Link (GOLD) Manual does not include this in its tables.

5-3-4

En Route Procedures