Fuel weight data disagree error

[pijnackerpilot]

Hello all, 

 

Today I did a Qatar flight from Islamabad (OPIS) to Doha (OTHH) in the A35K. I set up simbrief to take along a block fuel of 33000 which is plenty for this flight. As per OP, I loaded the fuel and payload via the load sheet. All as indicated on the OFP, generated by simbrief using the A35K profile provided by simbrief. After loading the Fuel and Load page (screenshot taken after being airborne for one hour), I already noticed that the required fuel enroute burn was significantly lower than stated below. 

The route includes a step climb to FL400 at TAPDO over the Persian Gulf about 2/3 into the flight. 

After take of I got a master caution and an ecam memo that states Fuel Weight data disagree. I followed the steps on the ECAM but all checks out. I don't know where this message is coming from. All checks out during the flight. Fuel consumption is according to the flight plan and I didn't have any fuel leaks

What is causing this error and why does it still impact landing performance even if all is good.

Additonally, on the STS page it states that BTV and autoland are now inop. Why?

I hope someone can help me out here on what is going on.

Thanks in advance. 

 

 

 

Edited March 27 by pijnackerpilot

[sunake]

Hmm not sure, is it possible something changed your fuel quantity during the flight? Did you use gsx to load and the correct fuel amount was loaded? 

[pijnackerpilot]

That might be the case. GSX was acting up the whole ground time prior to take off.

What is recommended regarding proper use of the OIC 'loadsheet' page in conjunction with GSX integration? In what order do things need to be done to do it properly?

 

[sunake]

I have no clue at the moment. I'm waiting for all the A350 and GSX integration bugs to be ironed out before I even install GSX. 

[nirhtac]

Just got the same issue, doing a flight from sydney to kuala lumpur but right after takeoff I got that same ecam message. Any fixes?

 

[Miao Si]

Hi All, I've had this issue on 1.0.7 too.

So far, I have been able to bypass the error to get BTV and autoland operational by simply "resetting" the ZFW on the Fuel&Load page of the active FMS

To "reset" ZFW, just click the field box and hit "enter" without typing in any values.

• If you're using SimBrief, you may also need to reimport your loadsheet from SimBrief before "resetting" the ZFW via the FMS.

Hope it helps!

Edited April 17 by Miao Si
Included more specific information

[Isiattie]

Same thing happened to me, after updating to 1.0.8.  Flying KLAX-WSSS, 2 mins after takeoff...

Tried resetting simbrief loadsheet, and ZFWCG on active FMC, but just doesnt clear.  Also tried adjusting the FINRES values.

Also, on systems, NO AUTOLAND message,

[Evan Boyle]

Had the exact same issue after 1.0.8 as @Isiattie

[magret2canard]

This issue is linked to the boarding done via GSX.

Could you try just to load and apply ZFW/Fuel from the OIS without using GSX?

[Isiattie]

I don’t use GSX for boarding.  Only for pushback.  
 

I always use the OIS to sync with simbrief and then the FMCS. And from there also load weight and fuel.  
 

I’m doing the return flight as we speak, got the same message.   
 

it must be something related to 1.0.8.   It didn’t happen on prior versions. 

[Isiattie]

Anyone knows If it’s a common issue and if so, will Inibuilds be addressing it in an update?

[AlexNajar]

On 4/17/2025 at 1:50 PM, Miao Si said:

Hi All, I've had this issue on 1.0.7 too.

So far, I have been able to bypass the error to get BTV and autoland operational by simply "resetting" the ZFW on the Fuel&Load page of the active FMS

To "reset" ZFW, just click the field box and hit "enter" without typing in any values.

• If you're using SimBrief, you may also need to reimport your loadsheet from SimBrief before "resetting" the ZFW via the FMS.

Hope it helps!

This worked for me! Thanks! But I am quite sure it is a bug and Inibuilds should know that!

[haza2]

6 hours ago, AlexNajar said:

This worked for me! Thanks! But I am quite sure it is a bug and Inibuilds should know that!

I will send to the team.

[Stefan Schweizer]

This issue is also present in v1.0.10.

I load the simbrief FPL on the EFB Loadsheet page and press the SET ZFW button.

Thereafter I board the aircraft via GSX.

Because I got the FUEL Disagree message also on the last flight, I pushed the SET ZFW button again to make sure, that the correct ZFW is loaded into the aircraft.

But i doesn't! After departure I got the disagree message. When I clear the ZFW value in the FUEL/LOAD page of the FMS and enter, I see the loaded ZFW. In my case it was 155 t instead of 191.4 t!!

So every flight I make, I always have 155 t instead of the value I have loaded. I am not sure if it is a GSX issue or the load via the EFB is the problem.

When I overwrite the ZFW value in the EFB Loadsheet page and push the SET ZFW in flight, no change happens. Still 155 t.

How can I change the ZFW in flight, if at all? I can change the fuel load in flight, but obviously not the ZFW.

Thanks for any hint.