The FAA proposed an airworthiness directive (AD) on Oct. 20 that would require removing certain NavWorx Inc. model ADS600-B remote-mounted universal access transceivers (UATs) from the aircraft in which they have been installed, and would prohibit their installation on any aircraft. The products provide Automatic Dependent Surveillance-Broadcast (ADS-B) Out and In on the 978-MHz frequency. The FAA estimates that approximately 800 U.S.-registered aircraft would be affected by the proposed AD.
Source: aopaFAA seeks removal of NavWorx UATs