What typical CASA rubbish. Shows a lot of intelligence doesn't it, lets standardise on CLass D zones. Lets see, one size fits all, from Cessna 150 to Boeing 737. Then we add a bit here, and a bit there to accomodate those blasted jets that won't conform to the Cessna 150 circuit size. Its a bit rude really, because, on my flightsim, I can fly a B747 tighter than a 150. Whats wrong with two or three frequency changes, or flying a holding pattern with unknown traffice.
I just hope that Airservices have got some spare portable radars ready to install a la Launceston.