Document ID: chunk:federal_register_of_legislation:F2022C00813:reg:300:p3
Version: federal_register_of_legislation:F2022C00813
Segment Type: reg
Provision Reference: reg 300 (pt 3/27)
Character Range: 77401–80596

Minima are available only for operations by aircraft with dual ILS/VOR navigation capability (that is, with duplicated LLZ, G/P, Marker and VOR receivers). Although not specified and not required, it is assumed that such aircraft will also have duplicated ADF systems.

8.1.10.2         Ground Equipment. For a location to be considered it must be served by ILS, LLZ or straight in VOR instrument approach procedures to at least two runway directions which are suitable for use by all aircraft likely to use the special low alternate minima.

8.1.10.3         The instrument approach procedures should preferably utilise different VHF ground equipment. However, the use of the same ground equipment for both approaches is acceptable provided the equipment meets the requirements of ICAO Annex 10, Volume 1, Attachment C, Table C2 or Attachment F, as applicable, and an alternative straight in instrument approach procedure which utilises a different aid is available.

8.1.10.4         Other Requirements. Only controlled aerodromes qualify. The Special Alternate Minima shall not be available during any period when ATC and Bureau of Meteorology (BoM) observations and forecasting services are not provided at the aerodrome concerned.

8.1.10.5         Calculation of Special Alternate Minima. To calculate Special Alternate Minima:

(a)         add 500 ft ceiling and 1.5 km visibility to the ceiling and visibility minima of the VHF runway aligned instrument approach procedure which provides the greatest advantage.

(b)         add 400 ft ceiling and 1.5 km visibility to the ceiling and visibility minima of the VHF runway aligned instrument approach procedure to an alternative runway.

(c)          when required by paragraph 8.1.10.3, add 300 ft ceiling and 1.5 km visibility to the ceiling and visibility minima of any other straight-in instrument approach procedure which utilises an aid other than those used in paragraphs 8.1.10.5(a) and 8.1.10.5(b) above.

8.1.10.6         The alternative minimum is the highest of those obtained above. Ceiling values should be rounded out to the nearest 50 ft. Visibility values should be rounded up to the next higher kilometre or half kilometre.

8.1.10.7         An extra margin over and above those mentioned above may be added if believed to be necessary because of peculiarities in the local weather patterns and/or difficulties in forecasting.

8.1.10.8         Invalidation of Special Alternate Minima. Instructions shall be promulgated in appropriate operational documents requiring aircraft operators/pilots-in-command to monitor the availability of required navigation aids and BoM meteorological services. These will include issuing of appropriate instructions requiring the reversion to standard alternate minima during periods when:

(a)         local BoM METAR/SPECI are not available;

(b)         BoM forecasting services are not available;

(c)          protracted unserviceability (ie. greater than 7 days) of any ground equipment associated with the approach aid exists;

(d)         an aerodrome control service is not provided.

8.1.11              International IFR Operations Outside Australia

8.1.11.1         Alternate