Re: Rain in the plane

From: (Ronald R. Fey)
Organization: Hewlett-Packard Laboratories, Palo Alto, CA
Date:         20 Nov 94 01:59:01 
References:   1 2
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Dear Airliners,

The air at cruise altitudes of jet airliners has only a few percent humidity.
It is extremely dry as most of the water has frozen and settled out.  No
dehumidifier is necessary on a plane.

If there is condensation on the interior skin of a plane, it is from the
passengers.  Not much you can do to dehumidify them.  About all you can do
is to limit the airflow over the interior surfaces of the skin.  Somehow
seal the cabin airflow away from the skin.  Or maybe ventilating the space
between the skin and the cabin lining with fresh outside air to keep it dry.