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6/17/21 

AIM 

TBL 5

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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 

RSPD

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

WILCO 

DM1 UNABLE 

DM1 UNABLE 

RSPD

Indication that the 
message cannot be 
complied with. 

UNABLE 

DM2 STANDBY 

DM2 STANDBY 

RSPD

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 

RSPD

Indication that the 
message is re-
ceived. 

ROGER 

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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 

SUPU

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

DUE TO 

(specified reason 
uplink) 

UM167 DUE TO 
AIRSPACE RE-
STRICTION 

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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 

SUPD

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 

En Route Procedures 

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