400 Freighter

[Jack57]

Can anyone tell me why some B747-400F's have a sliding ZFW/TOW scale......i.e. smaller ZFW's mean larger TOW's and visa versa?????

[Intruder]

Yes.

Otherwise, too much weight in the fuselage, and not enough in the wings. The wing bending moment is then excessive.

[CR2]

Are you refering to Extended ZFW (Variable ZFW to our US colleagues)?

[744rules]

standard mzfw is around 276000kg

above that, you have to check the mtow as it is decreasing due to wingbending. When using increased zfw , forward max cumulative weights will decrease as well.

Max increased zfw is around 288000kg