G5Jimmy

I too could never resolve this same issue despite searching for years, so I just got to the point of turning ground traffic off. However, this post got me to re-try to change the settings of the pesky fuel truck's soundai.cfg The solution I found was to change the number of engines to zero. [sOUND_ENGINE] number_of_engines=0 eng1_combustion=COMBUSTION.1.00 ....and yes the ai vehicles still drive around. Happy Fying... Jim

If you are still having this issue, maybe this will help. The panel state load file has a corrupt Cabin Altitude Value.Go into your FSX directory, then PMDG/747400/PanelStateLook for the saved flight that has the cabin altitude warning when it loads. It will be the .sav file.Edit this file with notepad. (Right click on it and select edit).Under [PressurizationSystem.0] is the setting for Cabin Altitude.Set it to a value where it should be. It doesn't need to be exact, but appropriate to the aircraft's altitude for the pressurization schedule. For example- cruise flight, set it to Cabin Altitude=8000 I hope this helps... It worked for me.