Area 80 NOTAM
RADAR COVERAGE, RADAR INFO SER AND RADAR BASED TRAFFIC INFO SER NOT
AVBL
IN DARWIN AREA OUTSIDE OF 40NM DARWIN AND ACT MIL RESTRICTED AREAS
DLA/RESTR MAY OCCUR IN CTA
DUE DARWIN RADAR DATA NAVBL TO CIVIL ATS
STAR CLEARANCES WILL NOT BE ISSUED TO AIRCRAFT
INBOUND TO DARWIN
DARWIN MIL RADAR SER PROVIDED WI 40NM DARWIN AND WI ACT MIL
RESTRICTED AREAS
FROM 06 282346 TO 07 310600 EST
C1449/07 REVIEW C1152/07
Just guessing but this is probably the reason.