This one's been bothering me when looking at fuel tankering.
The wing doesn't know the difference between pink quivering SLF, their baggage, freight-and center tank fuel, we very often fly both where the total of centre tank plus payload exceeds ZFW limits, yet no one bats an eyelid?
Apparently ballast fuel may be carried up to payload plus actual ZFW but the total not to exceed the ZFW limit, and it may not be considered useable due CofG problems which could result.
Is this "wings part empty", ctr tank not, only a LANDING restriction, in normal circumstances?
Alas the OMs various available to me are not particularly helpful and specific.
MEL/DDG for inoperative auto-shutoff of centre tank pumps also allows centretank fuel to a specified limit on landing, so any good hard info on this would be appreciated.
Yet another grey area in our inadequate and widespread flight manual culture.
