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Which is the more accurate calculation?

Updated: Jul 17, 2023

I have been noticing two different ways some performance charts are being calculated. Below are two charts. Using 20 degrees Celsius, and a pressure altitude of 2000 feet, and an aircraft weight of 3600 lbs. Which one is going to give you the more accurate calculation, and why?

Iacra Instrument Rating Instructions

Chart A

Iacra Instrument Rating Application

Chart B

Ohhh, and the answer isn't, "My instructor taught me it that way".

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