FAA to require 5G-tolerant radio altimeters as FCC clears C-band auction

The FAA has issued a final rule requiring all US radio altimeters to meet new 5G interference-tolerance standards, with compliance deadlines staggered by aircraft type. The FCC simultaneously cleared Upper C-band spectrum (3.98–4.14 GHz) for auction, with safeguards including power limits, buffer zones, and a rebate programme funded by auction proceeds to offset retrofit costs estimated at $4.49–$7 billion across 40,900 aircraft.

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