Engineering services relating to aeronautical systems and vehicles, radar systems, propulsion systems, airframes, aviation maintenance, aviation safety, aviation operations, aviation testing, and helicopter systems; establishing testing specifications and procedures in the field of aviation; engineering consultancy services; engineering services, namely, engineering services in the nature of providing experts to examine engineering-related issues and technical project studies; scientific research; research in the field of mechanical engineering; scientific and technological services, namely, scientific testing in the field of aviation; development services and research services with regard to new products; providing services of an engineer, namely, engineering, aeronautical engineering services, mechanical engineering; performance of diagnostic measurements on aviation and aeronautic equipment; engineering research services, particularly technical project planning for aircraft and helicopters; technical consulting in the field of engineering and aeronautics; technical consultation in the field of power plant engineering, namely, testing and evaluation of power plant equipment to improve performance and efficiency of such equipment; conducting technical researching in the field of engineering, aeronautics, power plants for the purposes of rendering opinions