Avionics
FAA Issues Radio Altimeter Upgrade Mandate
Covers most aircraft operated under Part 135 and 91K, and some under Part 91
FreeFlight Systems RA-4500 Mark II upgrade uses the existing wiring, structural, and antenna provisions already on the aircraft. The RA-6500 is designed to mitigate 5G and other radio frequency interference
FreeFlight Systems RA-4500 Mark II upgrade uses the existing wiring, structural, and antenna provisions already on the aircraft. The RA-6500 is designed to mitigate 5G and other radio frequency interference

The FAA has released a final rule upgrading the radio altimeter minimum performance requirements on aircraft operating in the 48 contiguous U.S. states and the District of Columbia to ensure that they can withstand interference from wireless services in the 3.70- to 4.2-GHz frequency (C-band) that is adjacent to frequencies used by aircraft. 

Under the rule announced late last week, the mandated upgrade applies to aircraft equipped with radio altimeters, including the majority of those flown under Parts 121, 125, 129, 91K, and 135, and a “minority” under Part 91.