NOTAM - AIRAC1903 Sector File and Client Installer Downloads 1 INTRODUCTION The VATPAC sector files are produced and developed by the operations department every 3 months. The version released today is AIRAC 1903, effective on the 28th of February 2019. The sector files provided support both the Virtual Radar Client and the Euroscope Client.   2 DETAILS SID/STAR updates for Australia and New Caledonia. PH_TWR Frequency change to 127.400. VFR fix upd