On Mon, 05 Jan 2004 18:07:59 -0700, Michael Williamson
wrote:

That is to say that if you take off from sea level and climb
to 10,000', the cabin altitude will steadily climb, at a rate
set by the cabin pressure controller, toward 8,000'. If you
were to level off at 5,000' and stay there long enough for
the cabin pressure to catch up, it will maintain 5,000'
until the aircraft begins to climb again,

This is not true on Boeing aircraft. In flight, the pressure
controller maintains a "proportional" pressure differential between
aircraft and cabin altitude.

If the aircraft levels off at an intermediate altitude, the cabin will
not continue to climb but will level off also - it will not "catch up"
to the aircraft (actual) altitude.

(This only refers to Boeing aircraft and the DC-9. YMMV.)

-J

Jack Davis
B-737


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