Emergency exits capacity

From:         mezei_jf@eisner.decus.org (Jean-Francois Mezei)
Organization: DECUServe
Date:         11 Sep 95 21:27:26 
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I have a few question on emergency exits for airplanes :

Is the "must be able to empty plane in 90 seconds" a real requirement or just
urban legend ?

Are there specific and widely accepted ways to measure each exit's capacity in
an emergency ? If so, what are the criteria used ? (door size, chute length,
cabin/aisle design ?) Or do aircraft manufacturers actually load up a plane
with people and make the test ?

Does anyone have specific numbers on how many passengers a full fledged door
(with chute) can process (per minute ?) and how over-wing exits fair in that
regard ?

If the "90 seconds" requirement is true, does it apply to a plane with all of
its doors usable, or does it assume that a certain percentage of its doors will
be unusable ?