"Ron Natalie" wrote in message
. ..

"Dudley Henriques" wrote in message
nk.net...
Hey, you mountain types out there :-) I'm doing some research on a
safety
issue and need your help . I need a post from someone flying out of
Colorado
somewhere, preferably Telluride or a field very close to Telluride.

Leadville, CO is the highest elevation airport in the US (at least so says
the sign
on the FBO building). Been there once.

I can't imagine using QFE in the mountains, not just because of the fact
that the
instrument won't handle it. You don't have to go very far from a
mountain
strip until you get into radically different terrain heights. Those
altitudes are
published in MSL, the relationship to the airport field elevation isn't
overly
interesting.

I understand . That's why I specified the context as not being in the right
or wrong dept :-)..... (restricted to only the possibility factor). I just
can't remember the Kollsman low pressure side maximum for our GA altimeters
here in the U.S. I think it's 27.5 or 25.5 but I can't remember exactly
which; and I need to have this for a data point.
I'm attempting to come up with an average point above sea level based on a
standard atmosphere where 0 sets can't be made under normal conditions.
Should be easy, but I need that Kollsman range to do it.
Right now, with the information I have, I'm at around 2500 feet ASL for that
maximum, but not remembering that Kollsman window range, I want to be sure.
I just need some verifying data.
Thanks Ron,
Dudley