Re: Oxygen - Concorde

Date:         04 Jun 99 00:59:02 
From:         "John Weiss" <jrweiss@seanet*NOSPAM*.com>
References:   1 2 3
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The 747-400 has 2 cabin pressure controllers, though only one is active at a
time.  The second one automatically takes over if the first fails.  Normal
pressure differential is 8.9 psi.

The Eros full-face masks for the cockpit crew on the 747-400 also have an
"Emergency" positive-pressure setting that can be used if necessary.  I
believe that type of mask is available on other aircraft, too.

John R. Weiss
Seattle, WA
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