Commonwealth Numbered Regulations

1988 NO. 158 CIVIL AVIATION REGULATIONS - REG 99

99. (1) The Authority may designate:

   (a)  an aerodrome at which aerodrome control service is provided as a
        controlled aerodrome;

   (b)  airspace that is within defined horizontal and vertical limits as a
        control area or a control zone;

   (c)  airspace in respect of which flight information and alerting services
        are available as a flight information region;

   (d)  airspace in respect of which operational control service is provided
        as an operational control area; and

   (e)  airspace, not being airspace referred to in paragraph (b), (c) or (d),
        as airspace in respect of which operational control service is
        provided only to regular public transport aircraft.

(2) Where the Authority designates an aerodrome or an airspace under
subregulation (1), the Authority shall cause a notification of the
designation, including details of the boundaries of the airspace, to be
published in Aeronautical Information Publications or, where the designation
is of a temporary nature, in NOTAMS.

(3) Where:

   (a)  an aircraft that is experiencing difficulties requests assistance; or

   (b)  Air Traffic Control has reason to believe, on meteorological or other
        advice, that an aircraft is not aware of all of the operational
        factors affecting the flight that it is undertaking;
        operational control service may be provided to that aircraft whether
        or not the area in which it is operating is an area to which
        operational control service would otherwise be provided.