C-band

The Federal Aviation Administration (FAA) has issued two airworthiness directives (ADs), one for helicopters and one for airplanes, containing measures that will avoid potential effects on aviation safety equipment that could occur as a result of the Jan. 5, 2022, deployment of 5G technologies in the C-band. These ADs will require flight manual limitations that prohibit certain operations requiring radio (radar) altimeter data at locations that will be specified in future Notices to Air Missions (NOTAMs).