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B77X

77W calculator always 70c derate

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I am selecting TO, flaps 5, and so many weights always give me a derate of 70c. I know I am not that heavy, but I should be seeing less temperature than 70c for derates should I? Is there some calculation that is wrong? When I enter 70c even the v speeds are not close to the range of the pmdg 77w FMC. Thank you

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