At non-controlled aerodromes this change would expand the volume of airspace contained in the CTAF to a 20 nautical mile radius laterally
Interesting. So if all CTAFs become a defined 20NM radius i.e. 40NM wide, how many overlaps will that cause with others?
Also beneath low CTA steps e.g. within 30NM Melbourne in Class G everyone IFR & VFR will need to be on a CTAF or 126.7 and not contactable by ATC unless dual VHF.
They've only ever been able to warn anyone if they are on the same frequency.
And right now that's usually what the case is in Class G i.e. ATC and aircraft are on the FIA unless a CTAF or an ALA using 126.7 is involved. This proposal seems to change all that below 5000FT.
no one is saying not to monitor area anytime you want.
Not sure that is correct. Looking at the diagram, if you are below 5000FT you will need to be either on 126.7 or a CTAF if necessary. If you are in an area isolated from CTAFs and you have dual VHF,
then you could monitor the FIA as well as MULTICOM.