Discussion
A long-range aircraft pumps fuel to a tail trim tank in cruise. The purpose is
Answer: B
Correct answer: To move the centre of gravity aft
Trimming the centre of gravity aft in cruise reduces the download the tailplane must carry, and that download is a real drag penalty because the wing has to lift it as well as the aircraft. Pumping fuel to a tail tank buys that saving over the long cruise where it matters most, and the fuel is pumped forward again before descent to keep the landing case within limits.
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