The explanation is in the AIM reference.

Bob

"Guy Elden Jr" wrote in message
oups.com...
Something I've always wondered... why do TRSAs even exist? Seems like a
dangerous proposition to choose some airports as having the concept of
a voluntary controlled airspace? Why not a Class C (their closest
cousin as far as I can tell)?

--
Guy Elden Jr.

Bob Gardner wrote:
AIM 3-5-6 says that participation by VFR pilots is voluntary...and for
IFR
pilots, TRSA's don't even exist in Part 71.

Bob Gardner

wrote in message
...
Is VFR participation by a non transponder equipped aircraft
encouraged/permitted in a TRSA?

Thanks.