TBL 5-3-13

Standard Response Downlink Message Elements (RSPD)
Operational Definition in PANS-ATM (Doc 4444)

CPDLC Message Sets
FANS 1/A

ATN B1

Response

Message
Element
Identifier

Message Element
Intended Use

Format for
Message Element
Display

DM0 WILCO

DM0 WILCO

RSPD-1

Indication that the
WILCO
instruction is understood and will be
complied with.

DM1 UNABLE

DM1 UNABLE

RSPD-2

Indication that the
message cannot be
complied with.

UNABLE

DM2 STANDBY

DM2 STANDBY

RSPD-3

Indication that the
message will be responded to shortly.

STANDBY

DM3 ROGER
Note - ROGER is the
only correct response
to an uplink free text
message.

DM3 ROGER

RSPD-4

Indication that the
message is received.

ROGER

TBL 5-3-14

Supplemental Uplink Message Elements (SUPU)
Operational Definition in PANS-ATM (Doc 4444)

CPDLC Message Sets
FANS 1/A
UM166 DUE TO
TRAFFIC
UM167 DUE TO
AIRSPACE RESTRICTION

ATN B1

Response

Message
Element
Identifier

SUPU-2

Message Element
Intended Use
Indication that the
associated message
is issued due to the
specified reason.

Format for
Message Element
Display
DUE TO
(specified reason
uplink)

TBL 5-3-15

Supplemental Downlink Message Elements (SUPD)
Operational Definition in PANS-ATM (Doc 4444)

CPDLC Message Sets
FANS 1/A

ATN B1

Response

Message
Element
Identifier

DM65 DUE TO
WEATHER
DM66 DUE TO AIRCRAFT PERFORMANCE

DM65 DUE TO
WEATHER
DM66 DUE TO
AIRCRAFT PERFORMANCE

SUPD-1

En Route Procedures

Message Element
Intended Use
Indication that the
associated message
is issued due to the
specified reason.

Format for
Message Element
Display
DUE TO
(specified reason
downlink)

5-3-9