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Old 6th Apr 2016, 10:02
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Pulsar1
 
Join Date: Oct 2013
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Average ISA Deviation

Hi Aviators,

I am stuck with the Average ISA Deviation.

Based on Boeing FCOM; the Descent forcast page, it said we need to input Average ISA deviation

What is it actually? And how to calcuate ?

Thanks in advance
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