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KMID : 0608619990090030267
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Korean Journal of Aerospace and Environmental Medicine
1999 Volume.9 No. 3 p.267 ~ p.276
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Air Travel and Transportation of Patients(I) A guide for physicians
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Danish Armed Forces Health Services
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Abstract
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The average passenger airliner cruises at an altitude of approx. 30-40,000 ft. This is
the equivalent of about 10 km(as 1 ft.=30.48 cm). The outside pressure at this altitude is
about 1/4 atm. or 190 ㎜Hg.
These days, all civil airliners are equipped with a so-called pressurized cabin.
Compressors maintain a differential of max.1/2 atm. Between cabin pressure and the
outside atmospheric pressure. At the normal cruising altitude of 30-40,000 ft.(1/4 atm.)
this will give a cabin pressure corresponding to 6-8,000 ft.(3/4 atm.), somewhat
depending on the type of airliner. Cruising altitude will usually be reached within 10 to
15 minutes of take-off and descent will begin approx. 30 minutes before landing.
Principally considerations of design with regard to maintaining a balance between
safety, weight and comfort dictate that the modern commercial airliner is not constructed
to maintain sea level atmospheric pressure, although this is technically possible; indeed,
in the case of Concorde, which has a higher cruising altitude(50-60,000 ft.) than the
average airliner, it is almost a reality.
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