37 Repair of electrical and electronic apparatus, instruments, systems, equipment and devices for use in the aeronautical field excluding computer software and systems; repair, overhaul, servicing and maintenance of systems, equipment and parts of aeronautical vehicles and their components, including engines, turbines, engine nacelles, reactors, thrusters, thrust reversers, braking systems, landing systems, wiring and excluding computer software and systems; under-wing repair, overhaul, servicing and maintenance services for all types of systems, equipment and parts of aeronautical vehicles except computer software and systems; upgrading, renovation and standard replacement of systems, equipment and parts of aeronautical vehicles, including engines and expressly excluding computer software and systems; on-line around-the-clock assistance relating to the repair, overhaul, restoration, servicing, maintenance and standard replacement for systems, equipment and parts of aeronautical vehicles expressly excluding computer software and systems; technical advice and assistance relating to the maintenance, repair, and servicing of aeronautical vehicles and component parts thereof, including motors, engines, turbines, engine nacelles, reactors, thrusters, thrust reversers, aeronautical vehicles, braking systems, landing systems, and wiring expressly excluding computer software and systems; repair of ancillary equipment and tools for aeronautical vehicle systems, equipment and parts expressly excluding computer software and systems