I did a flight today with the 777 from KEWR to EBBR but I had a problem with the fuel. I calculated everything to have a 10000kg reserve and when I programmed the FMC on the ground everything was good. But as the flight progressed I noticed that the predicted amount of fuel  was getting lower and lower. In short, I landed with only 4000kg left in the tanks, luckily I did not have to divert or go around. I did another flight(same route)to make sure that it was not some failure or something like that. I made my flight plan with simbrief and I used a route from flightaware plus the wind uplink(second flight was with clear weather from fsx)

 

My questions are: Is this behavior normal? What should I do to avoid this problem?

 

Here are some picture to illustrate:

 

Just before takeoff

 

1-2 minutes after takeoff

 

 

Few hours later

Which flight planner did you use? Did you upload the winds into the FMC? If it doesn't know the winds, and you have a headwind all the way, fuel consumption will be greater than anticipated by the FMC.

Using PFPX for plan and ASN for actual wx, I have always found my 777 flights to use fuel as predicted to a remarkable degree of accuracy. Where differences arise, I am able to justify them as actual winds encountered differ from the wind forecasts.

 

If you are having problems, then I can only believe that your flight planning accuracy and en route actual weather could be helped by using the excellent PFPX and ASN software.

 

HTH

PMDG 777 Issue Tracking Thread.

Found / Fixed / Adjusted for SP1:

 

Fixed numerous issues related to FMC fuel prediction.

 

Soeren Nielsen

I used simbrief and the wind uplink, like I mentioned in my first post.Since this is not the real world, I'll just fly with an extra 20 000 KG till this problem is resolved.

 

Thanks guys!

I must have glanced over your statement of using simbrief, my apologies.

Anyway, I have the feeling simbrief uses less accurate profiles than PFPX. This may just be me though...