On Jul 22, 7:04*pm, "BT" wrote:
This has been discussed during various IFR courses and refreshers.. I'm
running on old memory here.
For a Part 91 operation it is not enforceable. The tower has no way of
knowing what the pilots in-flight visibility is at the approach end of the
runway.
I have seen pure VFR on one end for 2,000ft of a 10,000 ft runway.. with the
other parts of the airport the fog so thick you could not see the lines to
taaxi.

Me too. Althought I believe if RVR is reported, that is enforceable.
Otherwise, my understanding is the same as yours. Only those in the
cockpit know flight vis.

For Part 135 and other operations, the pilot cannot even begin the approach
for a "look see" if the visibility and ceiling are reported as less than
that required for the approach.

Yes, but if the reported wx degrades after crossing the FAF they can
continue the approach. So perhaps if they land with reported vis below
mins they could be busted? That doesn't sound right either.

-Robert