Originally Posted by
Sunfish
The trap Andrew is at the Southern end of the Avalon airspace where the lower level changes from 2500 to 1500 where you least expect it.
That CTA base 1500FT step to the south - and the one north - have been there since CTA was established at AVV (30-40 years ago??).
A CTA base 1500FT (or thereabouts) step is common adjacent to most CTRs, to contain aircraft in CTA on descent and climbout.
Its a matter of reading the charts.
Continuous two-way comms for Class E means
capable of continuous two-way comms, but don't ask me where the distinction is in AIP.
FWIW almost all aircraft call AVV APP transiting the Class E there, probably not a bad thing due to the amount of PTO and IFR training aircraft.