So why is that, in Canada, the Multicom frequency and the ‘default’ CTAF frequency are different? They are 126.7 and 123.2, respectively.
In the system you envisage, triadic, if an IFR aircraft is inbound to an aerodrome with a CTAF that is not 126.7, will that aircraft be broadcasting on 126.7 when passing through 5,000’?