Let's pretend I'm taking off from some place rather cold like Boston, Massachusetts where the temperature right now is roughly between -23 to -10 degrees celsius on a consistent basis every day in the winter. I don't understand why this would be and where he got this number from. In the PMDG 777 Tutorial 1.0 it shows entering a temperature of 65 degrees celsius. On the THRUST LIM page in the FMC, you need to enter in an assumed temperature for the thrust rating of the engines for takeoff and the initial climb. I've read the documentation so many times regarding this but I still don't understand it.
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