OK, here is a real world example and an honest question:
Not far from Adelaide is Tailem Bend which has a VOR and NDB but no airfield and it is used quite heavily by the various training organisations and flying schools for IFR approach practice. The procedure was that after requesting traffic for descent if there were other aircraft operating or inbound to
TBD, ATC would give the traffic information and then you would switch to 126.7 and coordinate with each aircraft at what levels you would operate, how long, intentions etc. then switch back to ATC and give your operating levels and OPS Normal time. This obviously stops all the chatter being over the Area Freq. 125.3.
Now as there is no CTAF (or airfield) I can think of 3 possibilities;
1. This procedure (whilst expedient) has always been incorrect and the Area Freq. should have been used to coordinate between aircraft.
2. This procedure was correct but should not be used anymore as all transmissions should be on area freq.
3. This procedure was correct and still is correct.
I'm not sure which of the 3 possibilities is correct, anybody know the answer?