On Tue, 16 Aug 2005 02:44:54 GMT, George Patterson
wrote:

Bruce Hoult wrote:

My recollection of my O2 training is that the rule is 30 minutes over
10,000 ft, or if you go over 12,500 ft at *all*.

No. 12,500' if you exceed it for 30 minutes or 14,000' if you go over that at
all. At 15,000', passengers also have to be on oxygen. Section 91.211.

This is all irrelevant if there is no oxygen in the system. That'd
be my guess. Too much trouble to check or refill. Tanks at the
airport are empty. Somebody sold them to a welder . . . .

Don