From the Policy Statement 2010 alluded to above, don`t ya love it;
21 These proposals will be to (a) change the classification or designation of airspace, (b) not change a classification or designation, but make other proposals to improve airspace arrangements, or (c) recommend a continuation of current airspace arrangements without any other proposals.
22 CASA will provide these proposals for public comment and, after considering these comments, then make a determination to be implemented as directed by CASA, by the relevant parties.
23 Following a decision to change the class of a volume of airspace (a determination), that change must be formalised as a legislative instrument, endorsed by the airspace delegate, and published on FRLI. After a change has been registered on the FRLI, it can then take effect on, or after, the day on which the determination is published in the AIP or when notified by a Notice to Airmen (NOTAM). Designations of Prohibited, Restricted and Danger Areas may be published in the AIP or notified by a NOTAM subject to the requirements of the Airspace Regulations 2007.
24 There may be times when urgent decisions are required to meet a safety imperative and it may not be practicable to comply with parts of this process.