"Michael Houghton" wrote in message
...

Non sequitur.


No, a non sequitur is a statement that does not follow logically from what
preceded it.



I don't believe that anyone has asserted that ATC cannot
instruct one to remain clear of Class C airspace.


You've stated that aircraft that are so instructed may enter Class C
airspace. What's the difference?



What you contend,
without justification, is that that instruction, once givenn, must
be explicitly and overtly overriden with some sort of instruction --
examples of which are not found in the AIM, nor in any other official
source. You have failed to cite any authority for your assertion.


Actually, I have cited the AIM, the FARs, and FAAO 7110.65. What you
contend, without justification and contrary to simple logic, is that that
instruction, once given, does not require aircraft to remain outside of
Class C airspace. You have failed to cite any authority for your assertion.



91.130(c)1 defines how one is authorized to enter Class C airspace. You
then insist that once a communication using the tail number is made that
includes a "remain clear" instructionn, that instruction remains in force
in the face of subsequent communications such as "N1234, standby".


That is correct.



I posited a scenario that fits your conditions; you asserted that entry
would be permitted in my scenario -- a clear contradiction without an
explicit acknowledgement of such. You are allowed to change your story,
but you don't get to do so silently.


Is this what you're referring to?

"Consider the following scenario."

"You take off outside the Class C and would like to transit it. You are
instructed to remain clear. You circumnavigate it, reach your destination,
and return without landing. You again approach the Class C with the
desire to transit rather than go around. You call up ATC again and they
reply with your tail number but no instructions. Can you go in or not?
I'm positing on the order of an hour or more elapsing between the two
attempts to transit."

In this scenario two-way radio communications are established and the
aircraft is NOT instructed to remain clear of Class C airspace. No
contradiction here.



In the matter at hand, how do Class D and Class C airspace differ?


That's not the point. Travis is seeking "expert advice" about Class C
airspace from controllers at a field with Class D airspace.