Originally Posted by
Lead Balloon
Is your "SFC to 5000ft agl or CTA LL" whichever is the higher, or whichever is the lower? Given that you say that "[o]verflying aircraft should monitor (Insert name of new MBZ thing) frequency while overflying lateral limits but above 5000 agl for conflicts", it seems you're advocating the lower. Otherwise the overflying aircraft would, by definition, be in CTA.
If yes, you're advocating for the upper level of the Ballina BA/MBZ/MBA to be lowered to 5,000' AGL rather than remain at the 8,500' AMSL C LL / 6,500' AMSL C LL. Is that correct? It does make a difference to whether an aircraft overflying at e.g. 5,500' is obliged to make an entering call at the boundary.
And you're advocating for the Lismore, Casino and Evans Head CTAF to be changed to something other than 124.2. Correct?
The Port Hedland BA is 20 nm radius of the ARP up to 8,000' AMSL. Are you advocating for that to be reduced to 15 nm radius and 5,000' AGL? Given the kinds of traffic in the Ballina BA, there'd be no objective justification for the BA/MBA/MBZ dimensions to be larger at Port Hedland, would there?
Yes forgot the which ever lower, caveat, also as per the last paragraph of my post above 5000ft class whatever will be mandatory radio and transponder and listening out on whatever its called. So conflict will be not an issue, obviously if you are monitoring and hear a conflict you respond appropriately. Currently aircraft leaving class C, E into G are required to give a broadcast to announce traffic so that part of the conflict is already addressed.
With regard to dimensions I really don't see the need for much past 15nm, as 5000 ft at 15nm is standard 3 deg profile for most high performance on descent and they easily meet that altitude on departure. Extend to 20nm or 25nm if you wish, or just make it that aircraft in class G should monitor CTAF at least out to 30nm (double the boundary) if practical, inbound or outbound. Above 5000ft center will in most cases see the transponder return and advise traffic.
For frequencies that area is indeed a unique set so lateral boundaries would have to be tweaked to fit in with most likely traffic.
And of course why ADS-B is not fitted to ground level at Ballina or Mildura is a mystery beyond comprehension.
It's coming to a point where collision avoidance systems are commonplace in cars, and will probably be mandated for future new vehicles. Yet aviation resists a pretty solid collision avoidance system based on technology available 30 years ago due to a price which is a fraction of what an aircraft costs relative.