AIM

8/15/19

5

−

3

−

9

En Route Procedures

TBL 5

−

3

−

13

Standard Response Downlink Message Elements (RSPD)

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

DM0 WILCO

DM0 WILCO

N

RSPD

−

1

Indication that the
instruction is under-
stood and will be
complied with.

WILCO

DM1 UNABLE

DM1 UNABLE

N

RSPD

−

2

Indication that the
message cannot be
complied with.

UNABLE

DM2 STANDBY

DM2 STANDBY

N

RSPD

−

3

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

STANDBY

DM3 ROGER

Note 

−

 ROGER is the

only correct response
to an uplink free text
message.

DM3 ROGER

N

RSPD

−

4

Indication that the
message is re-
ceived.

ROGER

TBL 5

−

3

−

14

Supplemental Uplink Message Elements (SUPU)

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

UM166 DUE TO
TRAFFIC

N/A

N

SUPU

−

2

Indication that the
associated message
is issued due to the
specified reason.

DUE TO 

(specified reason
uplink)

UM167 DUE TO
AIRSPACE RE-
STRICTION

TBL 5

−

3

−

15

Supplemental Downlink Message Elements (SUPD)

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

DM65 DUE TO
WEATHER

DM65 DUE TO
WEATHER

N

SUPD

−

1

Indication that the
associated message
is issued due to the
specified reason.

DUE TO 

(specified reason
downlink)

DM66 DUE TO AIR-
CRAFT PERFOR-
MANCE

DM66 DUE TO
AIRCRAFT PER-
FORMANCE