CAR states you can join on the base leg at certain aerodromes:
(4) The pilot in command of an aircraft may join the circuit pattern
at a non-controlled aerodrome on the base leg, for the direction
in which landing is to be undertaken, only if:
(a) CASA has given approval to do so; and
(b) details of the approval have been published in AIP.
Anyone know where the approvals are written? Or is it in a sup?