class C and B comms on sectionals?

"Magnus" wrote in message
...

In the legend on sectional charts there are a number of frequencies
listed for the various class B and C airspaces and airports.

For example, the northern florida chart has jacksonville listed as
"120.75 (091-180)". Now, during my commercial checkride a
month ago my examiner asked me what the numbers in
parenthesis were and I said they were courses from that C-airspace
primary airport. So if you would draw lines from Jacksonville
international and out on a magnetic course of 091 and 180 degrees,
you would have as a result a pie-shaped sector on the chart. If
you're approaching the C-airspace and your location is withing
that pie-sector you should use 120.75 Mhz to get your clearance
to enter the airspace.

There is also a small COMMs box on the chart itself located southeast
of the airspace so that makes sense to me.

However, my examiner said that 091-180 in the legend are in fact
RADIALS. The airspace in question on my checkride was the B
airspace around orlando, and she said these numbers are radials
from (in that case) ORL VOR and not courses from the airport.

1. Why would they use VOR radials for this on a VFR chart,
when a VOR isn't even required for VFR flight?

2. The C airspace set up for Jacksonville international doesn't
even have a VOR.


Is there a source where I can get more information on the legend that
the sectionals have?


The A/FD doesn't have any additional information. I don't recall seeing
anything that actually stated these were bearings from the field, but, like
you, I always assumed they were. Obviously, they can't be radials in
airspace without VORs, so to be consistent they'd have to be bearings from
the field. In the case of ORL, it wouldn't make a difference as the VOR is
on the field. I would've asked the examiner for her source on that.