No RAAS installed in 9W 737 NG aircraft , the new MAX comes with it from the factory. Also 9W uses Jeppesen and I believe the Saudi AIP also not showing the taxiway K on its airport diagram.A NOTAM explaining a closed taxiway that doesn’t exist on your airport charts would need a keen suspicious mind to determine its actual existence.
As to why they turned onto the under construction taxiway where they “expected” to find the runway not noticing the difference in lighting , it’s anyone’s guess right now , there have been numerous instances of pilots lining up and taking off and landing from closed/wrong runway/taxiways and an important lesson for us all
masalama
