the activation of C-Band frequencies by AT&T and Verizon means that improved 5G networks are now available for millions of Americans. The long-anticipated rollout began on January 19, but with one caveat: Both companies temporarily pushed back plans for 5G networks near certain airports after criticism from the Federal Aviation Administration and multiple airlines about interference from 5G repeaters affecting airline radio altimeters.
AT&T’s and Verizon’s C-Band frequencies primarily range from 3.7 to 3.98 GHz; airlines are concerned these mid-band waves may impact the radio altimeters that pilots use to know how far planes are from the ground. A recent statement from United Airlines says that, “when deployed next to runways, the 5G signals could interfere with the key safety equipment that pilots rely on to take off and land in inclement weather.”
Two days before the 5G rollout, the trade organization Airlines for America sent a letter, signed by major airline CEOs, to US Transportation Department secretary Pete Buttigieg and others, urging them to intervene and stop 5G implementation within 2 miles of airports, something other countries have required as part of their own 5G rollouts.
When AT&T and Verizon postponed 5G by airports for six months, the companies emphasized the autonomy of their decision. In a statement to WIRED, an AT&T spokesperson says, “At our sole discretion we have voluntarily agreed to temporarily defer turning on a limited number of towers around certain airport runways as we continue to work with the aviation industry and the FAA to provide further information about our 5G deployment, since they have not utilized the two years they’ve had to responsibly plan for this deployment.”
Verizon’s similar comment on the situation focused on how the company “voluntarily decided” to pause the rollout and pointed blame toward the FAA and the airlines for not preparing to handle 5G frequencies, “despite it being safe and fully operational in more than 40 other countries.”
For their part, the FAA is trying to figure out which radio altimeters will not be affected by the 5G deployment. When C-Band is released near airports, Boeing 787 operators have been advised by the FAA to use extra precaution during storms. If necessary, aircraft can be retrofitted with improved altimeters to assist with landings in low-visibility situations.
According to a release from the FAA, “The agency approved two radio altimeter models that are installed in a wide variety of Boeing and Airbus planes. This combination of aircraft and altimeter approval opens up runways at as many as 48 of the 88 airports most directly affected by 5G C-Band interference.” The Boeing 777, which is in wide use by both American and global airlines, is not yet included on the FAA’s list of approved airplane models.
President Joe Biden released a statement thanking AT&T and Verizon for the delay. It says, “This agreement will avoid potentially devastating disruptions to passenger travel, cargo operations, and our economic recovery, while allowing more than 90 percent of wireless tower deployment to occur as scheduled.”
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