Originally Posted by
NSEU
The aircraft have their own densitometers and compensators for computing weight.
But how accurate are they? We pushed back the other day with more fuel in tanks 2 and 3 than what was in 1and 4 so the override pumps were on for 2 and 3. During the climb tanks 2 and 3 both displayed 5 or 600 kg less than 1 and 4(although there was no EICAS message) so the override pumps were selected off for those tanks with 1 and 4 crossfeeds closed. After levelling off, 2 and 3 now unexpectedly had more fuel than 1 and 4 again so we went back to the original configuration.
Which makes me think that these quantity guages are not very accurate in the climb. Theoretically are they supposed to compensate for aircraft pitch.
And is the Xfeed Config message inhibited during climb?