Headwind A330-900neo MCDU Fuel Calculation

User Support Hub Aircraft & Systems
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1

Hi,

maybe someone can help me with the FMC fuel calculation of the Headwind A330-900neo.
I use the FBW A320 with Simbrief for a long time without problem and now also find the Headwind A330 an interesting project.
However, there is one thing I can’t get to work with there:
I load the flight plan, fuel and payload as usual from Simbrief and prepare the cockpit accordingly.
On the second INIT page (FUEL PRED) in the MCDU I always get incorrect values for TRIP and DEST FOB. After finishing the PERF page I also get a false calculation of the EFOB for the destination. Destination EFOB should be something in the range 4 -5 tons.
Screenshots follow. It looks like the TRIP FUEL is calculated wrong and it is also not correctable.
FINAL and MIN DEST FOB should be fuel quantities and not aircraft weights, right?

Has anyone noticed this or am I missing something?

Thanks and happy flying…

A330-init
A330-init869×1183 78.4 KB

A330-fp
A330-fp747×1151 67.6 KB

A330-simbrief
A330-simbrief794×884 127 KB

2

I think this is a bug that is known and logged by the developer. Just need to wait for a fix.

3

Also important to remember that it’s a predictive page; the A330 will still burn normally and should have close to the SimBrief EFOB at the end of the flight. Those numbers don’t control anything in the plane or the sim. (The ZFW/COG does matter, so make sure those are correct.)

It looks like the unit is predicting fuel usage as if it’s an A320 to me…

4

Thank you. Yes, I know, it still flies well and thanks to simbrief you can also trust that the fuel will be enough even for long distances.
From times before Simbrief, I am still used to check after refueling and before takeoff whether the aircraft thinks it will arrive on destination with the planned amount of fuel.
I compared it with the FBW A320, it needs about 10 tons of trip fuel. So that’s not where it comes from either…