I do a lot of work with Repair Stations/AMOs (Approved Maintenance Organization). For MROs (Maintenance Repair and Overhaul) which do business internationally, the customer’s national CAA (Civil Aviation Authorities) often require that maintenance performed on aircraft based there be performed by MROs certified to their nation’s regulations. Thus, it is common to see MROs with multiple certifications for all the nations they do business with. Each nation typically charges fees, and requires a de...