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A320 Pressurisation Profile

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A320 Pressurisation Profile

Old 5th May 2023, 14:05
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A320 Pressurisation Profile

Hi all,

Looking at FCOM DSC 21-20-30; it quotes a ROC/ROD and a differential of +0.1 PSI in both climb and descent.

My question regarding descent: the aircraft begins a descent and descends the cabin at a ROD. If you are descended very early and fly level for a period does this mean it then stops the cabin descent and maintains the differential at +0.1 PSI? In other words; cabin altitude correlates with aircraft altitude?

Thanks
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Old 5th May 2023, 17:29
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You are misreading the diagram. The rate of climb/descent to 0.1 psi is on the ground and is part of its prepressurisation/ depressurisation profile. Airborne the cabin is always pressurised as you can see on the level segments shown.
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Old 5th May 2023, 21:35
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Ah gotcha, I see it now. Any clue as to the question?
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Old 5th May 2023, 21:41
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Originally Posted by Boeingdriver999
Ah gotcha, I see it now. Any clue as to the question?
It looks like it keeps descending until it gets to max differential or the destination field elevation +0.1.
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