from QRH
long range cruise control: p. PI.11.2
weight 65,000 kg FL 370 FF/ENG=1231 KG/HR
FL 350 FF/ENG=1218
FL 330 FF/ENG=1239
FL 310 FF/ENG=1252
so multipy by two (if both engs working)
another QRH chart gives:
air distance: let's use 1000 NM
FL 310=4600KG FL330=4400KG FL350=4300KG FL370=4200KG
for "shooting from the hip" estimates-some use 40KG minute for hold, some use 50kg minute.
another rough guide=200KG per hour each 1000 feet below flight plan level.
i am sure you will get quite a range of differences.
Last edited by stator vane; 10th September 2006 at 11:40.