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AIM

10/12/17

5

−3−8

En Route Procedures

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

Message Element

Intended Use

Format for 

Message Element

Display

DM55 PAN PAN PAN
Note  

− N response at-

tribute

N/A

Y

EMGD

−1

Indication of an ur-
gent situation.

PAN PAN PAN

DM56 MAYDAY
MAYDAY MAYDAY
Note  

− N response at-

tribute

N/A

Y

EMGD

−2

Indication of an
emergency  situa-
tion.

MAYDAY 
MAYDAY 
MAYDAY

DM57 (remaining fu-
el

) OF FUEL RE-

MAINING AND 
(remaining souls)
SOULS ON BOARD
Note  

− N response at-

tribute

N/A

Y

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 at-

tribute

N/A

Y

EMGD

−4

Indication that the
emergency situation
is cancelled.

CANCEL 
EMERGENCY

TBL 5

−3−12

Standard Response Uplink Message Elements (RSPU)

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

UM0 UNABLE

UM0 UNABLE

N

RSPU

−1

Indication that the
message cannot be
complied with.

UNABLE

UM1 STANDBY

UM1 STANDBY

N

RSPU

−2

Indication that the
message will be re-
sponded to shortly.

STANDBY

UM3 ROGER

UM3 ROGER

N

RSPU

−4

Indication that the
message is re-
ceived.

ROGER

3/15/07

7110.65R CHG 2

AIM

9/13/18