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Old 6th April 2016 | 10:02
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Pulsar1
 
Joined: Oct 2013
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From: Third planet from the sun
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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