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