Inclusion of Additional Automatic Dependent Surveillance-Broadcast (ADS-B) Out Technical Standard Orders; Incorporation by Reference; Confirmation of Effective Date

This action confirms the December 18, 2023, effective date of the ``Inclusion of Additional Automatic Dependent Surveillance- Broadcast (ADS-B) Out Technical Standard Orders; Incorporation by Reference'' direct final rule published on October 17, 2023. The direct final rule amends the Automatic Dependent Surveillance-Broadcast (ADS- B) Out requirements to allow aircraft meeting the performance requirements in Technical Standard Order (TSO)-C166c (Extended Squitter Automatic Dependent Surveillance--Broadcast (ADS-B) and Traffic Information Service--Broadcast (TIS-B) Equipment Operating on the Radio Frequency of 1090 Megahertz (MHz)), or TSO-C154d, (Universal Access Transceiver (UAT) ADS-B Equipment Operating on the Radio Frequency of 978 Megahertz (MHz)) to meet the regulations. Aircraft equipped with ADS-B Out that meets the performance requirements of either TSO-C166c or TSO-C154d will provide additional information to pilots and air traffic control, including weather information, spectrum monitoring, and airspeed. They will also enable new wake turbulence applications, enhance weather forecasting, and enable or enhance ADS-B In applications such as Flight Interval Management.