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AIM

10/12/17

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

2/28/19

AIM