From: mezei_jf@Eisner.DECUS.ORG (Jean-Francois Mezei) Organization: DECUServe Date: 19 Mar 96 00:44:05 Followups: 1
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On a popular airline web site, there is a mention that on its 747-400s, when at altitude, the amount of air compressed into the plane weights one ton. I can understand that this would have an impact since it does make the plane heavier compared to the adjacent environment (thin air at 10km altitude) and hence does require more lift than would be needed if the cabin were not pressurized. When a plane is designed, is this a major factor taken into consideration or is that added relative weight when at altitude more than compensated by the loss of fuel to get up there ?