DM63 NOT CUR
RENT DATA AU
THORITY

DM63 NOT
CURRENT
DATA AUTHOR
ITY

SYSD-3

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

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

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

5-3-12

SYSD-3

En Route Procedures