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Old 23rd Mar 2020, 12:37
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APU fuel burn on the B777
Why is it that the APU fuel burn changes with weight at a fixed altitude.I can understand that it changes with altitude due to the drag on the APU door but cant seem to figure out with different weights and at the same altitude.

weight 300t. 260t. 220t
FL 310 230kg/hr. 220. 195.
FL100. 240. 240. 230.
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