The FAA has decided that automatic dependent surveillance-broadcast (ADS-B) will use a combination of the 1090-MHz extended squitter surveillance link for air carrier and private/commercial operators of high-performance aircraft, and the universal access transceiver (UAT) surveillance link for the typical general aviation user.

The FAA’s link selection is compatible with a joint strategy currently being coordinated by Eurocontrol and the FAA for implementing ADS-B enabled applications, thus providing for interoperability between the U.S. and Europe.

It also meets a request from the RTCA Free Flight Steering Committee to evaluate operational enhancements supported by ADS-B. The RTCA panel further recommended that the FAA evaluate the ADS-B technology alternatives.

ADS-B is considered a cornerstone of Free Flight because it provides applications that allow both pilots and controllers to have a common picture of airspace and traffic. The airborne systems transmit an aircraft’s identity, position, velocity and intent to other aircraft and to ATC systems on the ground, thus providing situational awareness to all appropriately equipped users of the National Airspace System.

FAA said the decision also means that it will actively work with the aviation community to develop and implement beneficial ADS-B applications, thereby stimulating user equipage; ensure that ADS-B is globally interoperable; develop the necessary standards; support spectrum planning and identify equipage requirements (for both aircraft and ground systems).