by Matt Thurber - November 2, 2021

The FAA has published a Special Airworthiness Information Bulletin -
AIR-21-18 - that highlights potential radio altimeter interference
issues by new 5G cellular networks. The 5G network deployment in the
U.S. starting on December 5 is in the 3700 to 3800-MHz bands then
later in the 3700 to 3980-MHz bands. Radio altimeters use the 4200 to
4400-MHz band.

In other countries, bands from 3300 to 4200 MHz are already deployed,
according to the FAA, and some "have implemented temporary technical, regulatory, and operational mitigations, including temporary proximity
and power restrictions." The FAA added, "There have not yet been
proven reports of harmful interference due to wireless broadband
operations internationally, although this issue is continuing to be
studied."

https://www.ainonline.com/aviation-news/air-transport/2021-11-02/faa-issues-saib-5g-radio-altimeter-interference

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