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TBL 5

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Emergency/Urgency Downlink Message Elements (EMGD)

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

DM55 PAN PAN PAN

Note

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 N response

attribute

EMGD

-

Indication of an

urgent situation.

PAN PAN PAN

DM56 MAYDAY

MAYDAY MAYDAY

Note

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 N response

attribute

EMGD

-

Indication of an

emergency

situation.

MAYDAY

MAYDAY

MAYDAY

DM57 (

remaining

fuel

) OF FUEL

REMAINING AND

(

remaining souls

)

SOULS ON BOARD

Note

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 N response

attribute

EMGD

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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

-

Indication that the

emergency situation

is canceled.

CANCEL

EMERGENCY

TBL 5

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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

RSPU

-

Indication that the

message cannot be

complied with.

UNABLE

UM1 STANDBY

UM1 STANDBY

RSPU

-

Indication that the

message will be

responded to

shortly.

STANDBY

UM3 ROGER

UM3 ROGER

RSPU

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Indication that the

message is

received.

ROGER

En Route Procedures

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