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Guest Pilot533

ISA DEV

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This has soemthign to do with weather right? Its an entry in the md-80 fmc, what does this mean?

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I haven't seen the FMC, but it's probably a field for the temperature deviation from the International Standard Atmosphere (ISA).ISA at sea level is, what, 15 degrees.So if it's actually 20 degrees, the deviation is 5 degrees.-Bryan

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please note the entry into the FMS might be the ISA Dev at cruise altitude and not at sea level.

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