TBL 5-3-18

System Management Uplink Message Elements (SYSU)
CPDLC Message Sets
FANS 1/A

ATN B1

Operational Definition in PANS-ATM (Doc 4444)
Response

Message
Element
Identifier

Message Element
Intended Use

Format for
Message Element Display

UM159 ERROR (error
information)

UM159 ERROR
(error information)

SYSU-1

System-generated
notification of an
error.

ERROR (error information)

UM160 NEXT DATA
AUTHORITY (ICAO
facility designation)
Note - The facility designation is required.

UM160 NEXT
DATA AUTHORITY (facility)
Note - Facility
parameter can
specify a facility
designation or no
facility.

SYSU-2

System-generated
notification of the
next datuthority
or the cancellation
thereof.

NEXT DATA
AUTHORITY
(facility designation [O])

TBL 5-3-19

System Management Downlink Message Elements (SYSD)
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

DM62 ERROR (error
information)

DM62 ERROR
(error information)

SYSD-1

System-generated
notification of an
error.

SYSD-1

DM63 NOT CURRENT DATA AUTHORITY

DM63 NOT
CURRENT
DATA AUTHORITY

SYSD-3

System-generated
rejection of any
CPDLC message
sent from a ground
facility that is not
the current datuthority.

SYSD-3

DM64 (ICAO facility
designation)
Note - Use by FANS
1/A aircraft in B1 environments.

DM107 NOT
AUTHORIZED
NEXT DATA
AUTHORITY
Note - CDA and
NDA cannot be
provided.

SYSD-5

System-generated
SYSD-5
notification that the
ground system is
not designated as
the next datuthority (NDA), indicating the identity
of the current data
authority (CDA).
Identity of the
NDA, if any, is also
reported.

En Route Procedures

5-3-11