37 Repair and maintenance of aerospace vehicles and their component parts; Repair of electrical and electronic apparatus, instruments, systems, materials and equipment used in the aerospace field, excluding software; Repair, overhaul, maintenance and servicing services for aerospace systems, equipment and parts and their component parts, including engines, turbines, engine nacelles, engines, thrusters, thrust reversers, fueling systems braking, landing systems, wiring, excluding software; Repair, overhaul, maintenance and in-wing maintenance services for all types of aerospace systems, equipment and component parts, excluding software; Refurbishment and replacement of aerospace systems, equipment and component parts; 24/7 online technical support concerning the standard repair, overhaul, overhaul, maintenance, servicing and replacement of aerospace systems, equipment and component parts; Technical advice and assistance relating to the manufacture, maintenance, repair, overhaul of aeronautical vehicles and their constituent parts, including engines, turbines, engine nacelles, engines, thrusters, thrust reversers, aeronautical vehicles, braking systems, landing systems, wiring; Repair of tools and equipment for aerospace systems, equipment and parts, excluding software