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TBL 5

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Voice Communications Uplink Message Elements (COMU)

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

UM117 CONTACT

(ICAO unit name)

(frequency)

UM117

CONTACT

(unit

name) (frequency)

W/U

COMU

-

Instruction to

establish voice

contact with the

specified ATS unit

on the specified

frequency.

CONTACT

(unit

name) (frequency)

UM120 MONITOR

(ICAO unit name)

(frequency)

UM120

MONITOR (

unit

name) (frequency)

W/U

COMU

-

Instruction to

monitor the

specified ATS unit

on the specified

frequency. The

flight crew is not

required to

establish voice

contact on the

frequency.

MONITOR

(unit

name) (frequency)

TBL 5

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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

required.

COMD

-

Request for voice

contact on the

specified frequency.

REQUEST

VOICE

CONTACT

(frequency)

TBL 5

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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

Element

Display

Used in combination with

LVLU

-

6 and LVLU

-

which is implemented in

FANS 1/A as:

UM38 IMMEDIATELY

CLIMB TO (

altitude

)

UM39 IMMEDIATELY

DESCEND TO (

altitude

)

EMGU

-

Instruction to

immediately

comply with the

associated

instruction to avoid

imminent situation.

Immediately

En Route Procedures

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