[Excessive Fuel use]

Thanks for your reply.

 

vor 16 Minuten, DaveCT2003 sagte:

Yeah, too many different topics in one thread.  People come in and post unrelated / different matters in existing threads. We do out best to fix this, but it's not easy.

 

I was one of those, sorry for that

 

 

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1. This issertion/assumption is merely user error or misunderstanding.  I've posted at least 4 times about this in numerous threads in the forum, but instead of searching the forum user jump in and create no posts even though we've addressed it many times over.   Later today I will do a video that shows the proper way to perform fuel planning for the Airbus Professional.  Of course I'll post it, but I can't force people to watch it.

 

Yes, I've read what you wrote about it somewhere and just wanted to sum up this thread.

 

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2.  I honestly don't know what  you are getting to my friend, perhaps a detailed explanation? 

 

The trip fuel varies massively when entering different block fuel values in the INIT FUEL PREDICTION page. It should only differ by small amounts according to the different fuel weight, shouldn't it? It seems not have an adverse effect on the flight, I just noticed it and thought it might be related.

 

 

 

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3.  I'll take another look at that.

 

Thanks.

 

 

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4. EFOB Values are completely wrong.  We've posted about this, and we're still conducting an investigation and reworking the code.  This is the only real fuel related problem I've experienced.

 

Indeed, this is the only real issue I encountered so far.

 

 

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At any rate, most of the Dev team is away until after the 1st, so we're asking for some paitence here.  I'll get the video out as soon as possible.

 

 

 

Take your time. I love the A330!

 

 

 

[Excessive Fuel use]

Just to get things sorted:

 

It seems there are at least five different issues mentioned in this topic:

 

1. The total fuel amount calculated by the Aerosoft Airbus X Fuel Planner is too low for the A330. Workaround: Enter the value calculated by Simbrief / PFPX.

 

2. The preflight trip fuel calculation on the INIT FUEL PREDICTION page inadequatly depends on the value entered for the Block fuel.

I see this on every flight preparation.

 

3. The GWCG is incorrect when loading via GSX.

It is okay when using Instant Load.

 

4. The EFOB values in the MCDU are too low during cruise, but the actual fuel consumption is correct compared to the Simbrief calculations and the preflight calculations in the MCDU.

I have this issue on every flight.

 

5. The actual fuel consumption of the A330 is too high.

I never had this problem so far and I am not sure if anybody really had or just aborted the flight due to the misleading EFOB predictions.

 

 

Just to confirm: Am I correct that none of these issue has been adressed in 1.0.0.5?

 

[Repaint requests (A330)]

vor 5 Stunden , steve dra sagte:

American Airlines...oh how I hate your paint!

So the bottom line is that this is going to be a gradient paint.

 

 

 

 

Looking forward. Thanks a lot for your contribution.

It's a shame American gave up that bare metal look - now that we have PBR!

 

Btw. anybody doing a Condor A330? Would be very much appreciated.

[Excessive Fuel use]

vor 7 Minuten, vysous sagte:

After disco, Jan

 

I'd assume that is a different issue then. The EFOB values for all waypoints are wrong right after takeoff.

 

[Excessive Fuel use]

UTC time predictions are ok for me. 

 

Were all your UTC time predictions completely off or only after the discontinuity?

 

[Excessive Fuel use]

For me this problem has absolutely nothing to do with ActiveSky.

 

This time I did not launch ActiveSky at all to test this. I used the "Cold Fronts" weather theme of P3D.

 

Exactly the same issue shortly after takeoff.

 

As you can see from the screenshot:

actual FOB = 15.8

EFOB at next waypoint (which is 9 nm away) = 10.1 !

 

 

 

Data.zip

 

[Excessive Fuel use]

vor 4 Stunden , F1le sagte:

didn't know about this topic, and today tried EDDF-KBOS. Around 159t ZFW and 51t of fuel regarding simbrief... After an hour flying -0.9 EFOB, engines around 6t/h (both, so 3t/h one) (during flight) and around 7t/h (both) during climbing. Thought I won't arrive and disconnected.

 

Maybe you can allow "in case of emergency" to refuel during flight. Now I know - add 5-10% more what Simbrief keeps saying, but as people keep saying - This will be my 1st plane where Simbrief can't calculate the fuel.

 

But the fuel consumption itself seems to be correct. It is just the EFOB values that are miscalculated somehow.

 

So you should be fine to continue the flight with the fuel calculated by simbrief.

 

Did you compare the actual FOB with the predictions calculated by simbrief for each waypoint? For me it always is quite spot on. And the EFOB values somehow recover to the end of the flight.

 

[Excessive Fuel use]

I just accidentally found this issue. It might be related. The trip fuel calculation apparently depends on the block fuel entered (and not just because of the different fuel weight). I just entered different block fuel values here pre-flight and the trip fuel shows unplausible values, it even becomes negative.

 

 

 

 

 

Additionally I also have the issue with the invalid GWCG value, reported here (and I cannot always solve it with "instant load"):

 

 

Maybe related as well.

 

 

[Excessive Fuel use]

vor 3 Stunden , Mathijs Kok sagte:

We have now spend some time with the logfiles and the videos and one thing is pretty obvious. In many occasions the predictions are whacked out of shape because of very weird weather. In one occasion the temperature at FL370 was +20 Celsius for a while (and -30 before and after) and in two others we seen an 80 knots tailwind  disappear in two seconds only to appear a few seconds later again.  If the fuel predictions are done in those moments it is obvious they will be wrong (or rather correct for the incorrect conditions).

 

It's not easy to decide on how to fix this.  Filtering out this obvious incorrect weather is a massive task and prone with problems. As other aircraft developers have to deal with the same issues I will talk to PMDG and see how they handle it.

 

Not going to make any comparisons here and only wanting to help:

I made 100+ flights using ActiveSky with the Airbus of the other (more expensive) developer that also imports the winds from ActiveSky and never ever had an issue with the EFOB predictions there. So I doubt that this can simply be put down to weird weather by ActiveSky.

 

Also if it was caused by fluctuations in the ActiveSky weather the EFOB values should also be fluctuating. But that is not what I see. The EFOB goes constantly down in the first half of the flight and goes constantly back up again in the second half of the flight.

 

[Repaint requests (A330)]

14 hours ago, steve dra said:

Lufthansa just uploaded

[...]

 

 

Great, thanks a lot!

 

And +1 for American and Hawaiian, please.

[Excessive Fuel use]

Data.zip

 

Just in case you need more logs.

 

The thread title is misleading because the actual fuel consumption is spot on. It is just the EFOB values in the MCDU that are significantly too low temporarily.

 

The EFOB values are okay until just after takeoff. Then suddenly all the shown values are about 6 + 8 tons too low. That starts with the next waypoint and continues from there. So the calculation between waypoints seems to be correct. The problem is that the EFOB for the next waypoint is much too low. The discrepancy gets worse for some time, then somewhere midflight starts to improve and shortly before approach the values get correct again. The actual fuel consumption is correct throughout the flight (according to SimBrief calculations for each waypoint and actual FOB readings).

 

That has been the same for me on all my flights so far.

[Excessive Fuel use]

vor 9 Stunden , ComSimPilot sagte:

Here is a picture.

 

The good news is that Simbrief prediction is very close to FOB. 

 

The bad news is that the MCDU is completely off. You can see that even the previous waypoint shows less fuel than the current FOB, and the prediction for the way-point which is 1 nm away is 7.8 tons less. I don't think this happens in the real aircraft.

 

Same here. The MCDU values that were initially totally off slowly caught up with reality during the flight and the values were correct when I reached the final waypoint.