37 Technical support services, namely, providing technical advice in the field of repair, maintenance, modification and overhaul services for airplanes, aircraft engines, gas turbine engines and rocket engines and replacement parts; providing configuration data and engine information data for airplanes, aircraft engines and gas turbine engines regarding operational, servicing and repair history; services of repair, maintenance, and reconditioning of propulsion systems for aerospace vehicles, engines, thrusters, nacelles, thrust reversers and their components; under-wing repair, mechanical repair revision, servicing and maintenance of all kinds of propulsion systems for aeronautical vehicles and their component parts; standardization, namely, refurbishment and standard replacement for repair of propulsion systems for aeronautical vehicles, engines, thrusters, nacelles, thrust reversers and their component parts; consultancy and assistance services relating to the repair, mechanical revision repair, servicing, standardization, namely, mechanical repair and maintenance of propulsion systems for aeronautical vehicles, engines, thrusters, nacelles, thrust reversers and their component parts