"Stan Prevost" wrote in message
...

91.155(a) defines VFR conditions for each class of airspace.


Correct.



91.155(c), which was the specific regulation you referenced, defines a
prohibition
against VFR operations under certain conditions in any airspace.


The question was, "Where does the 1000 come from?" The answer is FAR
91.155(c).



The issue at hand is the requirement in the ATC manual for ATC to "ensure
that weather conditions at the airport are VFR " as a condition to
issuing
a visual approach clearance. VFR conditions are defined in 91.155(a)
subject to an additional Class G permissive rule in 91.155(b) and
prohibitions against operations under certain conditions in (c) for all
airspace and (d) in B/C/D/E airspace.


Correct.



For VFR conditions to exist as required by 7110.65 7-4-3(b) in order to
clear an aircraft for the IFR operation under discussion, one must be able
to operate under VFR, including obeying cloud clearance rules.

That is not correct. The only IFR operation subject to VFR cloud clearance
requirements is VFR-on-top.