Altitude reporting equipment and transponder systems are crucial for the safe operation of aircraft within the National Airspace System (NAS). Air Traffic Control (ATC) monitors aircraft movements and ensures positive separation using identity and three-dimensional positional information obtained from individual aircraft's altitude reporting equipment and transponder systems.

Traffic Alert and Collision Avoidance Systems (TCAS), installed in nearly all commercial passenger air carriers and many other aircraft, rely on reliable and accurate altitude reporting equipment and transponder systems in surrounding aircraft. Additionally, ADS-B systems depend on aircraft equipped with dependable and precise position-reporting equipment and transponder systems.

Helpful Links: