In article t,
says...

The world record for helos is held by a French helicopter called a Lama at
something like FL410. Pretty unusual to hear of any flying above 10,000. I
don't think that I have ever seen a preasurized helicopter, certainly never
ridden in one.

Mike
MU-2



No longer the record. It's another French pilot who now holds that honor, in a
"common" AS-350 (Aerospatiale "squirrel") to FL425!!

http://www.fred-north.com/pages-frame/Biography-fr.html

I actually know this guy - he's a specialist in motion picture work.
Having flown with him once, I fully believe he would do this!

So, it's "possible" you would hear a chopper report at something like FL340,
or other non-standard altitudes, if you are near someone working on this type
of one-upmanship.

G Faris