Hello everyone,

 

I have problems with pmdg's fuel.

 

For instance I am flying from GVAC-TJSJ it is 5 hours flight. According to pfpx I should take 55000 kg fuel. And when I enter it in fmc I check the remaining fuel at the destination airport. And fmc says I will have 5.5 tons of fuel at landing.

 

But after I am airborne this value always decreases. For example I am in the middle of atlantic and fmc says that at 2150W (leg) i will have 0.0 fuel. The headwind is acceptable it is 30 knots. I also can't take fuel in the air because I am flying with fsairlines. 

 

So why the value of remaining fuel always decreases ? How can I solve this problem. Because this problem ruins my flights :(

30 knot headwind is considerable, are you allowing PFPX and your aircraft calculations to take those winds into consideration?

30 knot headwind is considerable, are you allowing PFPX and your aircraft calculations to take those winds into consideration?

 

Normally I should take at least 5.30 hours fuel. But PFPX offers me 7 hours fuel. So it is enough. 

 

Ithink this is not normal because when I'm on the ground the landing fuel is 5.5 tons. But when I fly fmc shows that i will have no more fuel before 600 nm from landing.

Are you sure your options are configured for Metric (kg's) weights and not imperial (lb's). Can't remember exactly where in the options this is located but it is worth checking out.

I have problems with pmdg's fuel.

When you have a chance you might want to look at this thread - http://www.avsim.com/topic/475382-fuel-at-destination-prediction/page-1. Pay particular attention to post #3 in which the fuel remaining per the FMC decreases in some situations and increases in other situations. I have been told by PMDG Support that there is no solution. This is from their reply of Oct 24, 2015, "we will pass this along to the team but I certainly don't consider this a critical fault in the FMC. We can't 100% accurately model the aircraft performance within the limitations of the simulator but we have done the best we can with the limitations that exist."

Hi I was the original poster of the thread mentioned above by Michael.

A number of things have happened since that post including a corruption for some reason of Windows 7 requiring a total format and reinstall.

Once FSX was reinstalled i downloaded the latest PMDG B777 installers and installed fresh.

Guess what, i no longer see the behaviour reported.

It may be worth uninstalling the B777 and reinstalling with the latest installers rather than updates.

I knew something screwy was going on and a reinstall of FSX and the B777 seems to have sorted it.

I would recommend you try a reinstall of just the B777 first rather than a full fsx reinstall as that is a pretty drastic action.

Hope this helps and good luck.

Tim Carter

AKA

Barra

Questions:

 

1. What is your PFPX weather source?
2. What simulator are you using? 

3. What is your weather source in the simulator?
4. Which aircraft are you flying? (-200LR/-200LRF/-300ER)

 

5. Have you up-linked/manually entered the winds/flight levels for every waypoint in the RTE data page?

6. Do the winds aloft on your PFPX release, match the winds encountered in the sim when you are flying?

 

7. Have you checked and confirmed you do NOT have the fuel leak failure enabled?

 

Remember, PFPX releases are only valid when the information inputted before the computation is valid. (garbage in = garbage out). Furthermore, if you plan a flight in PFPX with a ZFW of 185,000kgs departing a 2030z on December 1 using PFPX winds, but then load up the sim and set a ZFW 208,000kgs using November 23 historical winds in via Active sky Next and departing at 1500z, ( see the issue here?) you are bound to get very different results from what you planned.

It is essential that when flying a PFPX flight plan (unless planned and flown in clear weather) that the weights, dates/times (within 1-2hrs max, otherwise re-plan) and weather sources match.