Hi Jose,
looks like either a scenery issue or any issue in your scenery-file, because I can select the RNAV28 approach with the default sim-scenery:
What you can also try is to re-organize your scenery-file. Please follow exactly these steps:
When this is not a scenery issue (ie. the scenery delete all terminal procedures for this airport), than this re-organization should fix your problem. But this approach is included in the data, that´s clear …
PS: be aware, there are a lot of DMEArcs and RadialToFix segments included - not so easy to calculate (at least for the in-game flightmanagement impossible). So, don´t be suprise, when it doesn´t look as in the charts. I have tested this with the WorkingTitle CJ4, which uses their own flightmanagement and it looks good so far (better than then the original ones):
SPZO RNAV28 via SDARK
