Peter wrote: Probably not worth arguing about the charging difference, but AIUI you apply for an EASA STC using the FAA STC design data, and there is nothing special about that design data between EASA and FAA (it has to come from EASA 21 or FAA DER respectively, or be in the form of approved documents e.g. installation manuals). EASA does not accept FAA STCs; it accepts certain categories of...