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I share the ops questions, and I don't feel it's been fully answered yet. If you are flying through air at a constant pressure with the altimeter set properly, at standard temperature, then indicated is showing height above that altimeter setting, which could be 29.92, standard datum plane, or some other setting which is assumed to be mean sea level. Thus ...


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what nobody is considering here at all is the bleed air is highly compressed when taken from the engine. 400 to 600 degrees Celsius are not uncommon. But, what happens when you expand gases? Yes the opposite than when compressing it, it cools down. So the it would even without cooling get close to a reasonable temperature and, since the plane is not ...


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