Wrong fuel calculation?

[dkreiskott]

Hello Jean Luc,

As I was just looking into the tanks of the A320, I found an error in the fuel displays.
The total amount displayed and the amount in the individual tanks do not match. The amount filled up is also not calculated correctly.
To me, that looks like a calculation error?

Here is an example:
The amount of fuel according to the simulator letter is: 4,274 kg, which is transmitted to the simulator.



This results in 2,137.05 kg per tank in the simulator. This value is therefore correct.



The total amount is shown in the display with FOB 4270. This results in a difference of only -4kg.



For the individual tanks (left/right), only 2,130 is then shown. This results in a difference of -14kg
Apart from the fact that both displays show different values.



It would be nice if you could take a look at the calculation.

[jeehell]

Geez, do you realize that the accuracy of the FOB and each tank is +/-10 kg, which means that depending on rounding what you see is therefore correct?
2134 is rounded down to 2130
2134+2134=4268 rounded up to 4270

[dkreiskott]

Okay, but 2137, 05 is rounded not 2130. And 2137,05 is the Real fuel per tank. So the Resultat can be 2137 or 2140. I don't understand your answer.

[jeehell]

The rounding are probably always "round down" then. Which gives you this result. I don't recall exactly what was put there. And I will not change it because there is no issues in any case.

[Aron]

I really don't see a reason for change anything here, nevertheless I observed what the real 320 is doing after reading the post.

It seems to round on 10th on each tank and adds the rounded values together. As in one tank the value changes, the sum changes in the exact same moment.

Just for info! This is such a minor issue, I don’t even find words for this, no offence!