Difference between FU and FQI

[TO MEMO]

I guys,

For an A320 the manual specifies that Total Fuel quantity (measured in the thanks) has an acuracy of 1%. Fuel used has indicated in engine instruments has an accuracy of 1 to 2%. How come after a flight (an average of 2 hrs and 5 T consumption) there is always an average of 100 to 200 Kgs diference. I always include the estimated APU consumption.

Any toughts?

[hetfield]

Well if the consumption was 5t, than block was let's say 8.000 kg.

1% tolerance gives you maybe only 7.820kg actual, right?

5.000kg consumption, considering 1% tolerance may be actualy 5.050kg, right?

So at the end of the flight 130kg are "missing"

ciao