This is one of those threads that has taken on a misbegotten life of it's
on!

Here's an excerpt of one of my previous posts that (I think) provides the
correct answer to the original question on this thread:

The purpose of the "R" is to denote airports that have ASR where there would
be no other indication to a pilot that it existed.

Hopefully this will end it and we can move on to other fun stuff!



"Hamish Reid" wrote in message
...
In article ,
"Bill Denton" wrote:

My apologies if I unduly credited you. Actually, TRSA's were first
mentioned
in the second message on this thread. I simply felt your message was the
first to directly address TRSA's, as opposed to simply referencing them.

In the body of your message, you stated: "TRSAs are a lot rarer than
ASRs".
However, as has been noted, The Chicago Sectional shows one ASR and
three
TRSA's, which would contradict your observation.

I'm not sure I follow -- there are (probably) ASRs at (or for) all the
Class C and B airports on the Chicago sectional, as for (say) the SF
sectional. In the case I was thinking of, there's exactly one TRSA in
California, but maybe half a dozen ASRs in the combined San Francisco
Bay Area / Sacramento area alone (and, from memory, a similar number in
the LA area). Only a few of these are marked on the sectional
explictly, whereas a TRSA would always be explictly marked.

The fact that the sectional only explicitly notes that an airport has
an associated ASR when that can't be inferred from other information
doesn't mean the ASRs aren't there...

Hamish