Re: 747 forward cargo door

Date:         13 Dec 96 04:26:01 
From: (Jean Ludovicy)
Organization: EUnet Belgium, Leuven, Belgium
References:   1 2 3 4
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"john r." <> wrote:

>If you have to put more air into the cabin to maintain pressurisation
>that takes it from the engine, via the packs, and so increases fuel
>consumption by reducing their efficiency.

I'm afraid , that's not the way it works. It's not the packs wich
regulate airpressure in the cabin, but the outflow valve. The outflow
valve just closes a little bit further to compensate for an additional
small air leak maintaining the avarage airflow through the cabin
constant, so no additional fuel is needed for that reason.

>Also air leaking at the wrong place can cause drag.


Best Regards