"Gary Drescher" wrote in message
news:vo8Yb.330189$xy6.1616439@attbi_s02...

You still haven't answered the question of *when* you claim the
remain-clear instruction expires (in the sense that it no longer need
be explicitly rescinded in order for subsequent two-way
communication to constitute permission to enter).


How could subsequent two-way communication constitute permission to enter?



Is it when the pilot changes his mind? When the
controller discards the strip? After ten minutes? At midnight,
when the next day starts? Or when?


What difference does it make? Once the pilot decides to forego Class C
services it's a moot point.



You acknowledge that the remain-clear doesn't carry forward
forever. But if there's no way to say when it stops, then (as
others have proposed) a plausible alternative interpretation is
that it stops immediately, in the sense that *any* subsequent
call-sign "handshake" with ATC establishes permission to enter
(unless the remain-clear is then repeated).


Doesn't the request for anything expire the instant that something is no
longer requested? In this case, from the pilot's viewpoint, it expired when
he decided to leave the frequency and go around the Class C airspace. From
the controller's viewpoint, it expired when the aircraft didn't respond to
subsequent calls and he observed the aircraft change to a 1200 code.