X-Plane 10 Scenery--EDLF Grefrath-Niershorst, Germany. Grefrath-Niershorst airfield is a commercial airport in the district of Viersen and is located between the districts of Grefrath and Oedt. The aerodrome is approved for airplanes of the E-Class (single-engine aircraft to 2 t) motor gliders, gliders and microlights. Requires OpenSceneryX, RuScenery, R2 Library and the World2XPlane library. Please read the included documentation for installation instructions and where to download the required libraries. By Bjoern Meier.