What's minimum safe O2 level?

"Ron Rosenfeld" wrote in message
...
On Sun, 7 Nov 2004 17:58:17 -0500, "Icebound"
wrote:

Wasn't that borderline violation of the FARs 91.211? (30 mins above 12,500
pressure altitude)

What is a "borderline violation"?

Is the same as almost but not quite contrary to the regulations? If so,
then you've answered your question.

It was a rhetorical question. The real question was:
Why would you want to fly for 3.5 hours at the edge of a condition which the
FARs state is only safe for 30 minutes or less? Since, technically, it
might not have been a violation if the altimeter setting was more than
29.92, I can see stretching it a bit... maybe 45 minutes or an hour. But
3.5???