How to add new airport to the FMC/AIRAC

Hello

I have a question, I want to add new airport that is missing from the FMC(PMDG both 747 and 737 for FSX),

In my case it's missing a military field in the mid-est(ICAO LLNV).

I did make new "SIDSTAR" text for it, and added the "new" runways to the "wpnavapt.txt" and added the airport to "airports.dat".

The problem is that the FMC does not recognize the runways, it show "LLNV ERR: 08L RWY N/A"

Dose any one have any guesses how to fix it?

Thanks