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AIM

10/12/17

5−3−7

En Route Procedures

TBL 5−3−8

Voice Communications Uplink Message Elements (COMU)

CPDLC Message Sets

Operational Definition in PANS−ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message 

Element 

Identifier

Message Element

Intended Use

Format for 

Message Element

Display

UM117 CONTACT

(ICAO unit name)

(frequency)

UM117 CON-

TACT (unit name)

(frequency)

W/U

COMU−1

Instruction to es-

tablish voice con-

tact with the speci-

fied ATS unit on

the specified fre-

quency.

CONTACT

(unit name) 

(frequency)

UM120 MONITOR

(ICAO unit name)

(frequency)

UM120 MONI-

TOR (unit name)

(frequency)

W/U

COMU−5

Instruction to mon-

itor the specified

ATS unit on the

specified frequen-

cy. The flight crew

is not required to

establish voice

contact on the fre-

quency.

MONITOR 

(unit name) 

(frequency)

TBL 5−3−9

Voice Communications Downlink Message Elements (COMD)

CPDLC Message Sets

Operational Definition in PANS−ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message 

Element 

Identifier

Message Element

Intended Use

Format for 

Message Element

Display

DM20 REQUEST

VOICE CONTACT

Note  − Used when a

frequency is not re-

quired.

N/A

Y

COMD−1

Request for voice

contact on the spec-

ified frequency.

REQUEST

VOICE

CONTACT

(frequency)

TBL 5−3−10

Emergency/Urgency Uplink Message Elements (EMGU)

CPDLC Message Sets

Operational Definition in PANS−ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message 

Element 

Identifier

Message Element

Intended Use

Format for 

Message Ele-

ment Display

Used in combination with

LVLU−6 and LVLU−9,

which is implemented in 

FANS 1/A as:

UM38 IMMEDIATELY

CLIMB TO (altitude)

UM39 IMMEDIATELY

DESCEND TO (altitude)

N/A

N

EMGU−2

Instruction to im-

mediately comply

with the associated

instruction to avoid

imminent situation.

Immediately

9/13/18

AIM