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I don't think this issue has been addressed:
When aux tankage is installed in the hold, shouldn't any fuel in these be counted in ZFW just as if it were cargo?
It's being carried by the spar exactly as if it were cargo
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Centre Tank Fuel either trapped, becuase of some defect in the
Fuel System, or when using Centre Tank Fuel as a Trim/Ballast for an empty sector, will count as load and therefore will be included as part of ZFW.
DIH