What is TIS?
TIS is an acronym for Traffic Information Services. This system incorporates the usage of a Mode S transponder with datalink capablities. The datalink traffic capabilities are accessed through the FAA’s Traffic Information Services. The TIS System is available through 124 Mode S Air Traffic Control (ATC) radar sites throughout the United States. Aircraft within a 60 nautical mile (expected to increase to 90+nm) radius of a Mode S radar site will receive traffic advisories and warnings from ATC via the Mode S datalink. This information can be displayed on most modern multi function displays. Although this system uses standard traffic symbology when used an MFD, this system is not to be confused with and cannot be used in place of TCAS (Traffic Collision and Avoidance System) which is required by certain types and classifications of aircraft.
