Achim, I am serious about this. Here in Switzerland, IFR is stamped into the airplane documents. In order to get that entry, you need to comply with a minimum equipment list which is listed by the BAZL. Some of the equipment listed is conditional, which means you only need it if the airspace requires it, others not. As far as I can recall off hand, 2x Coms of which one 8.33, 2x NAV, 1x ILS, DME...