(Michael) wrote in message om...
How much protection do we have on an off-field VOR approach? I was
always under the impression that as long as the equipment was within
tolerances for an airborne VOR receiver check (+/- 6 degrees) and the
approach was flown to PTS tolerances (no more than 3/4 scale
deflection) it was impossible to hit anything. I now know this is not
necessarily true.
... So what am I missing?

An approach certified GPS

Sorry couldn't resist...but I recall we've had past
discussions where you opined that a GPS approach
didn't give you much in the way of capability and
this is one of the places where I feel the ability to
legally request and fly GPS approaches is more than
just an issue of whether there are other IAPs and
what their minima are.

Early on, I did the math on a bunch of approaches
around here, approaches where the VOR is seriously
off-field, and came to the similar conclusions. That
one could be w/in tolerances for a VOT check, be
just over half-scale deflection, and smack into
something. Heck you can center the needle on the
VOT check, center the needle on the approach,
and come out of a cloud with the airport over
THAR.

6 degrees and 3/4 scale deflection clearly aren't
good enough.

Cheers,
Sydney