On Wed, 10 Mar 2004 15:55:57 -0800, "David Brooks"
wrote in Message-Id:
:

You don't need one below 14,500'.

... for 30 minutes.

...on a day with low enough pressure to reduce the cabin altitude by 500'.


Thanks.


§ 91.211 Supplemental oxygen.
(a) General. No person may operate a civil aircraft of U.S.
registry—

(1) At cabin pressure altitudes above 12,500 feet (MSL) up to and
including 14,000 feet (MSL) unless the required minimum flight
crew is provided with and uses supplemental oxygen for that part
of the flight at those altitudes that is of more than 30 minutes
duration;