ooops forgot to answer this bit
(jaba ya dill)
Why the change??? (don’t shoot the messenger)
=jaba
DP 1102AS
http://www.casa.gov.au/wcmswr/_asset...d/dp1102as.pdf
Primary Means NAV
5.3 The basic justification for a mandate and the compliance timing is that it obviates the need for AsA to replace a large number of its navigation aids (mostly non-directional beacons and distance measuring equipment installations) which are rapidly approaching or already at end-of-life. AsA has estimated the cost saving of contraction to a backup navaid network to be about $120 million. In addition, advanced navigation applications such as Required Navigation Performance (RNP) navigation, User Preferred Routes, Flexi-Tracks and Area Navigation based Standard Instrument Departures and Standard Terminal Approach Routes are available using the GNSS.
5.4 For the foreseeable future some 180 existing terrestrial navigation aids are to be retained as the contingency means of providing alternative navigation for aircraft that retain ground-based navigation aid capability. The remaining (some 250) navaids are mostly at end-of-life, do not have spares support by manufacturers and are difficult and expensive to maintain and cannot be effectively supported beyond the end of 2015. AsA has informed CASA that, subject to the establishment of the GNSS mandate, it will commence decommissioning of the non-backup navaids from 1 January 2016. GNSS navigation provides safe navigation and greatly improved operational efficiencies in comparison with area navigation using ground navigation aids. CASA is satisfied that during the transition to satellite navigation the back-up terrestrial network will provide a level of alternative navigation in the extremely unlikely unavailability of GNSS. The cost/benefit of the GNSS mandate is clear cut in overall terms.
ADS-B OUT Component
8.5 As stated above, CASA does not intend to mandate for ADS-B OUT carriage by VFR aircraft in Class G airspace at this time. However CASA will maintain the existing requirement for the carriage of a transponder for aircraft operating above A100 in Class G airspace. This long established requirement mandated by CASA Legal Instrument is for the purpose of traffic detection by TCAS II equipped passenger transport aircraft. It does not necessarily require the target aircraft to have a Mode S or ADS-B OUT capable transponder, a Mode A/C transponder remains satisfactory for that purpose.
8.6 CASA will review and remain abreast of developments over the next 3 to 5 years and reconsider the case for a total fleet ADS-B OUT environment beyond year 2020 to support ADS-B IN based air-air surveillance for future air transport operations aircraft.
Hope that helps
