Date: 08 Sep 97 02:03:53 From: jf mezei <"[non-spam]jfmezei"@videotron.ca> Organization: VTL Followups: 1 2 3 4 5
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I have seen mentioned often that modern airliners maintain a cabin pressure of 8000feet when flying at cruise altitude of 30-40k feet. Is this an urban myth or actual precise figure that applies to all airliners ? Also, since most flights (even 1 hour hops) on jets tend to go to 30k feet and above, is it fair to assume that on just about all jet flights, the cabin pressure will go down to the 8000ft limit ? Or is the cabin pressure really determined by a pressure differential maximum which would mean, for axample, that Airplane X, able to maintain an 8000ft cabin pressure while flying at 40k feet, would maintain a higher cabin pressure (lower alttude) if it were to fly at only at 30k feet ? Reason for question: for scuba diving, the actual cabin pressure experienced by passengers can make a big difference for Decompression Sickness following dives.