AIM

8/15/19

5

−

3

−

11

En Route Procedures

TBL 5

−

3

−

18

System Management Uplink Message Elements (SYSU)

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 Ele-

ment Display

UM159 ERROR 

(error

information)

UM159 ERROR

(error informa-
tion)

N

SYSU

−

1

System

−

generated

notification of an
error.

ERROR 

(error in-

formation)

UM160 NEXT DATA
AUTHORITY 

(ICAO

facility designation)
Note 

−

 The facility des-

ignation is required.

UM160 NEXT
DATA AUTHOR-
ITY 

(facility)

Note 

−

 Facility

parameter can
specify a facility
designation or no
facility.

N

SYSU

−

2

System

−

generated

notification of the
next data authority
or the cancellation
thereof.

NEXT DATA
AUTHORITY

(facility designa-
tion [O])

TBL 5

−

3

−

19

System Management Downlink Message Elements (SYSD)

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 Ele-

ment Display

DM62 ERROR 

(error

information)

DM62 ERROR

(error informa-
tion)

N

SYSD

−

1

System

−

generated

notification of an
error.

SYSD

−

1

DM63 NOT CUR-
RENT DATA AU-
THORITY

DM63 NOT
CURRENT 
DATA AUTHOR-
ITY

N

SYSD

−

3

System

−

generated

rejection of any
CPDLC message
sent from a ground
facility that is not
the current data au-
thority.

SYSD

−

3

DM64 

(ICAO facility

designation)
Note 

−

 Use by FANS

1/A aircraft in B1 envi-
ronments.

DM107 NOT
AUTHORIZED
NEXT DATA
AUTHORITY

Note 

−

 CDA and

NDA cannot be
provided.

N

SYSD

−

5

System

−

generated

notification that the
ground system is
not designated as
the next data au-
thority (NDA), indi-
cating the identity
of the current data
authority (CDA).
Identity of the
NDA, if any, is also
reported.

SYSD

−

5