What do you mean by centralized load centre? So no matter what, the aircraft always gets loaded the same way (cargo and baggage), but what then sets CofG AFT or FWD option. Slightly confused !!!
Also why are some companys allowing pilots to use a set Cruise CG in the FMC?
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We use 18% CG on the PERF-INIT page for the whole flight which I find the number to be quite realistic. It makes a huge difference especially when you do a 5-6 hour sector with respect to fuel!