Fuel calculation off

[kosta]

Using the simbrief profiles from here, the fuel calculation is off. Using something like P05, does not calculate enough fuel in the FMC. Either is the profile off or the calculation in FMC. I have to up the fuel by 5T on the flight from EDDF to OMDB, which is about 10% more, to get to what I would like to have, about 5T on landing.

Wrong subforum: should go into systems.

This is causing further issues with flights done with OnAir and fuel planning.

Edited Saturday at 10:34 AM by kosta

[sunake]

Which variant, the 900 or 1000? I did one 9 hour flight with the 900 so far using the simbrief profile without any adjustment and I was using less fuel than planned. By the time I was at top of descent I was up by almost 5000lbs. Did you enter the step climbs and winds into the FMS? 

[kosta]

900.

There were no step climbs in the simbrief flight plan so no, I did not. Winds, yes, of course. Same for OAT and TRP.

[kosta]

Also, Simbrief OFP and what aircraft calculates also is pretty much off... maybe also the reason for the big disrepancy.