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Old 14th Jun 2003, 18:27
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mcdude
 
Join Date: Sep 2000
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As a general rule up to ISA + 15;

Optimum Flight Level = 570 - 3 x Gross Weight (tonnes)

Maximum Flight Level = OPT FL + 15

eg OPT FL for a GW of 75t = 570 - 225 = FL345

MAX FL for above example = FL345 + 15 = FL360

Hope this helps.
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