Been having this issue since yesterday after installing the latest Airac data from the Navdata Center. Regardless of where I go in the sim, I get the “not in database” error.
I have tried the “solution” from the other user who posted the same issue - but with no luck. I have changed nothing on my sim other than this Airac update. Hoping to find out the root of the issue and get it resolved as I was not having this issue before yesterday.
I have this exact same problem. No issue before installing navdata. Looks like installed correctly in comm. folder but all fixes/airports state not in database.
So after messing with this for a few hours, I went into the working folder in the MSFS packages folder, and there was a nav folder in there. C:\Users\XXXX\AppData\Local\Packages\Microsoft.FlightSimulator\LocalState\packages\pmdg-aircraft-737\work\NavData.
There was one runway file in there. Only file in the whole folder, I removed it (Saved it in case it didn’t work).
Funny you mention this fix as I found it posted somewhere else not long after posting this - and indeed deleting/removing RWY DATA file fixed my issue immediately. Not sure why it went from working to not - but I will keep this in mind for future Airac updates. Cheers!
Hi gents,
good finding, thank you very much for sharing this.
To be clarify:
This file is NOT a part of the AIRAC updates and doesn’t contain in our setups. We don’t build this file. It is a internal PMDG file and I assume it will be re-created when you delete it.
Only to make it a little bit clearer 
Thanks again for your reports and happy flying with a great addon
Richard
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