US issues 5G flight warning

The U.S. Federal Aviation Administration (FAA) warned that interference from planned use of 5G wireless spectrum posed an air safety risk and could result in flight diversions.
The aviation industry and the FAA have raised concerns about potential interference of 5G with sensitive aircraft electronics like radio altimeters. AT&T and Verizon Communications in November agreed to delay the commercial launch of C-band wireless service until Jan. 5 after the FAA raised concerns.
The FAA issued a pair of airworthiness directives ordering the revision of airplane and helicopter flight manuals to prohibit some operations requiring radio altimeter data when in the presence of 5G C-Band wireless broadband signals.
One FAA directive on Tuesday said the “unsafe condition” posed by the planned use required immediate action before the Jan. 5 deployment “because radio altimeter anomalies that are undetected by the aircraft automation or pilot, particularly close to the ground … could lead to loss of continued safe flight and landing.”