37 Repair and maintenance of aerospace vehicles and the component parts thereof; the construction and installation of industrial buildings and of test stands for systems, equipment and parts of aerospace vehicles; the repair of electric and electronic apparatus, instruments, systems and equipment for use in the aerospace industry; the repair, servicing, upkeep and maintenance of systems, equipment and parts of aerospace vehicles and the component parts thereof, including motors and engines, engine nacelles, reactors, propellors, thrust reversers, brake systems, landing systems, wiring systems; under-wing repair, servicing, upkeep and maintenance for all kinds of systems, equipment of parts for aerospace vehicles; upgrades, restoration and standard replacement of systems, equipment and parts of aerospace vehicles; on-line round-the-clock assistance provided seven days a week for the repair, servicing, restoration, upkeep, maintenance and standard replacement for systems, equipment and parts of aerospace vehicles; technical advice and assistance relating to the production, maintenance, repair, servicing of air vehicles and the component parts thereof, including engine nacelles, reactors, propellors, thrust reversers, air vehicles, brake systems, landing systems, wiring systems; repair of servicing equipment and tools for the systems, equipment and parts of aerospace vehicles