Today I wanted to fly to LTFM(New Istanbul Airport). My AIRAC cycle was 1309 so I updated it to AIRAC 2002. On FMC it was saying AIRAC data 2002 but when I came to RTE and typed LTFM to destination, it said invalid entry or something like this. LTFM is included in AIRAC 2002. Why does it do that ? Do I need to add it manually ? I only updated my AIRAC with a setup. Only did it for PMDG. If I need to add it manually how  can I do it ? I took a look at topics like this and I heard something named airport.dat and a .dat for runways too. I found it in my PMDG navdata files. In airport.dat I did CTRL+F and searched LTFM and it was there. I also did it in ARPT_RWY too but there was no text as LTFM. So; what should I do, I started to fly on IVAO and saw people departing to LTFM. I don't know how they did it. I need LTFM in my FMC database. Help

Delete the ARPT_RWY.dat. It will rebuild next time you load your PMDG aircraft.