CPV code 48131000 designates Aviation ground support software package in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
48131000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 48130000 (Aviation ground support and test software package).