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Old 30th July 2019 | 08:33
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Gin Jockey
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You don’t mention an aircraft type, but this would be nigh on impossible on the 737 due to the design of the fuel system. Firstly, the manual defueling valve would have to be open, which is only possible on the ground (you have to open a panel on the wing leading edge and if the valve is open, the panel cannot physically be closed). Also, the centre tank fueling valve switch would have to be open as (only possible when the fueling panel is open) as well as the cross feed (for fuel to transfer from the left wing tank into the center). If the crossfeed was closed fuel would transfer only from the right wing tank (assuming pumps on).
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