Person who plans, directs or himself installs, tunes, maintains and inspects aircraft systems and equipment (radars, autopilot systems, etc.) for the purpose of ensuring airworthiness of aircraft. She also repairs electrical and electronic systems by dismantling devices and replacing defective components. She also takes care of the preparation of quotes and ensures that the laws and regulations in force in the world of aeronautics are respected. Sometimes she needs to improve systems in order to achieve higher efficiency and lower maintenance and repair costs.