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So, what's a 'standard day' in England Crump?
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Pretty much the same as everywhere else for low altitude and subsonic aerodynamics.....
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For a standard reference, a concept called a standard day is used. In aviation, everything is relatedto standard day conditions at sea level, which are 29.92 in-Hg (1013.2 mb) and 15°C (59°F). Inthe lower atmosphere, and thus for most aviation applications, a 1000 foot increase in altitude willresult in a pressure decrease of approximately 1 in-Hg (34 mb) and a temperature decrease of 2°C(3.5 °F). These values are the standard day pressure and temperature lapse rates.
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http://navyflightmanuals.tpub.com/P-303/P-3030021.htm
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There you go again confusing modern day process in the USA with that of wartime Britain in 1940.
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There is thing called the Paris Convention of 1919. It is what gives British Aircraft the authority to fly in other countries, including the USA.
What it says in summary, we will all do things the same way regarding airplanes and meet the same standards.
http://en.wikipedia.org/wiki/The_Par...ention_of_1919