Destination fuel prediction bug ?

[Fergus 4]

I am finding with the 777 that the predicted fuel at destination figure keeps steadily decreasing throughout the flight - 

 

If I set a benchmark test -

 

If I set fixed winds in the FSX weather settings -these winds are then put into the cdu legs page during preflight. I stay at the same flight level for the whole flight. 

 

I also entered "0" for the step climbs in the CDU, so the FMS wasn't expecting any step climbs in the flights.

 

- The predicted fuel at destination figure that appears once airborne shouldn't change significantly through the flight 

 

- but in fact it does steadily decrease as the flight progresses (by a significant amount)

 

 

One of the many things that is impressive for me and one of the signs of quality in the NGX is that the predicted fuel at destination figure stays reassuringly steady throughout flights - (obviously, once all the relevant winds etc are programmed in to the CDU etc)

 

 

 

 

Fergus Cameron