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777 manual part 2

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I see there's two sections for each ac (looking at specifically 777-300ER page 8 and 9).One has "TAKEOFF RUNWAY LENGTH REQUIREMENTS STANDARD DAY +27oF (STD + 15oC)" while the other "TAKEOFF RUNWAY LENGTH REQUIREMENTS - STANDARDDAY" What does the +27oF(STD + 15oC) mean? Is that +27 degrees fahrenheit of the "standard day"? So, if it's a 100*F now, I would use the second takeoff runway length chart?

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ISA standard day (STD) sea level temperature is 15 deg C (or 59 deg F), so STD+15 deg C is 30 deg C. This is equivalent to 86 deg F, in other words STD+27 deg F.In answer to your second question, yes.Hope this helpsKevin

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