46-21 Air Traffic and Information Management System

46-21-01A Air Traffic Service Unit (procedures do not require ATC datalink)
46-21-01B Air Traffic Service Unit (procedures require ATC datalink)
46-21-02B Datalink Control and Display Unit (DCDU) (If Installed) (procedures do not require ATC datalink)
46-21-02C Datalink Control and Display Unit (DCDU) (If Installed) (procedures require ATC datalink)
46-21-03B ATC MSG pb (If Installed)
46-21-04A ATC Datalink (If Installed) (procedures do not require ATC datalink)
46-21-04B ATC Datalink (If Installed) (procedures require ATC datalink)
46-21-05A COMPANY Datalink