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It would seem to me that a cabin altitude of 8000' at an aircraft altitude of 8000' would create a differential of 1/1. A cabin altitude of 8000' at an aircraft altitude of 16,000' would give a pressure differential of 2/1. A cabin altitude of 8000' at an aircraft altitude of 32,000' would give a pressure differential of 4/1. This is because the measure of cabin altitude and the measure of outside altitude are done using altimeters calibrated at the same barometric pressure, with sea level at 0 ft. with the altimeter set at 29.92" Maybe it's not that simple.
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DJSchaut
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DJSchaut
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