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CPDLC Message Sets

Operational Definition in PANS

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ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message

Element

Identifier

Message Element

Intended Use

Format for

Message Element

Display

UM23 DESCEND TO  UM23 DESCEND

W/U

LVLU

-

Instruction that a

DESCEND TO

AND MAINTAIN

TO (

level

)

descent to the

(

level

)

(altitude)

specified level or

Note

-

 Used for a

vertical range is

single level

to commence and

once reached is

to be maintained.

UM36 EXPEDITE

W/U

LVLU

-

Instruction that a

CLIMB TO (

level

)

CLIMB TO

(altitude)

climb to the

Note

-

 This message

specified level or

element is equivalent

vertical range is to

to SUPU

-

3 plus

commence and

LVLU

-

6 in Doc 4444.

once reached is to

be maintained.

UM37 EXPEDITE

W/U

LVLU

-

Instruction that a

DESCEND TO

DESCEND TO

descent to the

(

level

)

(altitude)

specified level or

vertical range is

to commence and

once reached is

to be maintained.

UM38

W/U

LVLU

-

Instruction that a

CLIMB TO (

level

)

IMMEDIATELY

climb to the

CLIMB TO

(altitude)

specified level or

Note

-

 This message

vertical range is to

element is equivalent

commence and

to EMGU

-

2 plus

once reached is to

LVLU

-

6 in Doc 4444.

be maintained.

UM39

W/U

LVLU

-

Instruction that a

DESCEND TO

IMMEDIATELY

descent to the

(

level

)

DESCEND TO

specified level or

(altitude)

vertical range is

Note

-

 This message

element is equivalent

to EMGU

-

2 plus

LVLU

-

9 in Doc 4444.

to commence and

once reached is

to be maintained.

UM135 CONFIRM

LVLU

-

Request to confirm  CONFIRM

ASSIGNED

the assigned level.  ASSIGNED

ALTITUDE

LEVEL

Note

-

 NE response

attribute

UM177 AT PILOTS

DISCRETION

NE

See Note

Request to confirm

the assigned level.

NOTE

-

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

En Route Procedures

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