Hello All,

After having recently flown on the jumpseat of an A350 twice and having some conversations with the crew about the aircraft, I learned something funny about it. Due to the A350's huge fuel lines, when fuel travels from the tanks to the engines, an amount of fuel becomes "unaccounted for", as this fuel has not been used by the engines yet nor being weighed by the tanks. This causes the "( FOB + FU ) - Block = X " window in the System Display to display negative values, rarely 0 as is common on the iniBuilds A350.

From what I understood while talking about this with the crew, it is usually between 100kg to 800kg of fuel that can be "unnacounted for", depending on engine fuel demand. A fuel leak is only suspected if this value starts increasing steadily or becomes too high (Between 2500-4000kg according to A350 FCOM).

Given its even larger fuel system, I imagine this could also be present in the A380? I have no idea but it might be worth looking into.

While this is not an essential change, it would be great if you could add this real world fuel behavior to the iniBuilds A350, as this would add a good bit of extra realism. It is already an outstanding product regarding systems depth, so it would be amazing to see this little change improving it even further.

*A350 FCOM on ( FOB + FU ) - Block : https://www.scribd.com/document/760947026/A350-FCOM#google_vignette&content=query:Fuel%20leak,pageNum:2173

*Image attached below showing the Systems Display, with ( FOB + FU ) - Block showing -300kg.

Edited 9 hours ago9 hr by Peperlepep

Hi, I'll pass this along to our team, thank you!