AIR TRAFFIC SERVICES MAY BE LIMITED DUE TO SYSTEM UPGRADE.
SURVEILLANCE SERVICES PROVIDED FROM ADSB WITHIN YMMM MAY BE REDUCED. 

ADSC/CPDLC LOGON:YMMM SERVICE AND PDC NOT AVBL.

ALL AIRCRAFT PLANNING TO OPERATE IN YMMM FIR BETWEEN HOURS OF 1300

AND 1700 UTC SHOULD LODGE FLIGHT PLANS BY 1200 UTC TO MINIMISE RISK

OF DELAY