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In re:" One thing to think about is that  7.5psi  in the cabin on
the ground is a much smaller  pressure differential than  flying with  a
5psi cabin pressure  with an  outside density altitude of 29,000'.   You
would probably have to pump the cabin pressure up higher than 7.5psi to
really simulate flying in the flight levels.   John Wright  iv-p Colorado
Springs"

If we are talking about a pressure differential of 7.5 what difference does
it make what altitude you are? I'm sure I'm missing something- please
enlighten me.  Thanks -John Killian IVP  N37MB

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