(CNS/ATM) systems are vital to the safe, reliable and efficient delivery of air traffic services. ATSEP perform critical tasks on (CNS/ATM) systems or equipment which impact users. In order for ATSEP to fully understand the impact of their work on these systems, they must have a sound knowledge of the ATM operational environment. The consequences of system outages and their negative impact on users (i.e. pilots, air traffic controllers) may result in unsafe situations or cause excessive delays in airline operations.

CNS/ATM systems operations are regulated by international organizations that provide rules and standards to ensure the safe operation and interoperability of ANS worldwide. Among these organizations are ICAO, the European Civil Aviation Conference (ECAC), the European Aviation Safety Agency (EASA) and the Institute of Electrical and Electronic Engineers (IEEE). Achievement and maintenance of safety and efficiency in air navigation operations depend on the standardization of operational practices for international services. The syllabus should give a general view on aviation regulations as adopted by ICAO and implemented in international ANS operations.