Being a 744 engineer myself, I think it works this way:
The (full) wing can contain more Kgs of fuel when the SG goes up.
And itīs basic practice first to let the wing fill to the max capacity of +/- 110000 Kgs. using volumetric shutoff before filling the CW tank.
So, with more Kgs of fuel in the wing, you can put less in the CW tank and therefore less in the tail.
If in use, the tail will contain 1/10th of the amount that is in the CW.
So, 30000 in the CW means 3000 in the tail.
With regards,
Ballpoint
Last edited by ballpoint; 7th Feb 2008 at 18:23.