TBL 5-3-11

Emergency/Urgency Downlink Message Elements (EMGD)
CPDLC Message Sets

Operational Definition in PANS-ATM (Doc 4444)

FANS 1/A

ATN B1

Response

Message
Element
Identifier

DM55 PAN PAN PAN
Note - N response
attribute

EMGD-1

Indication of an
urgent situation.

PAN PAN PAN

DM56 MAYDAY
MAYDAY MAYDAY
Note - N response
attribute

EMGD-2

Indication of an
emergency
situation.

MAYDAY
MAYDAY
MAYDAY

DM57 (remaining
fuel) OF FUEL
REMAINING AND
(remaining souls)
SOULS ON BOARD
Note - N response
attribute

EMGD-3

Report indicating
fuel remaining
(time) and number
of persons on board.

(remaining fuel)
ENDURANCE
AND (persons on
board) PERSONS
ON BOARD

DM58 CANCEL
EMERGENCY
Note - N response
attribute

EMGD-4

Indication that the
CANCEL
emergency situation EMERGENCY
is canceled.

Message Element
Intended Use

Format for
Message Element
Display

TBL 5-3-12

Standard Response Uplink Message Elements (RSPU)
CPDLC Message Sets

Operational Definition in PANS-ATM (Doc 4444)

ATN B1

Response

Message
Element
Identifier

UM0 UNABLE

UM0 UNABLE

RSPU-1

Indication that the
message cannot be
complied with.

UNABLE

UM1 STANDBY

UM1 STANDBY

RSPU-2

Indication that the
message will be
responded to
shortly.

STANDBY

UM3 ROGER

UM3 ROGER

RSPU-4

Indication that the
message is
received.

ROGER

FANS 1/A

5-3-8

Message Element
Intended Use

Format for
Message Element
Display

En Route Procedures