In an unprecedented confrontation, the Federal Aviation Administration (“FAA”) and Federal Communications Commission (“FCC”) have been facing off over the imminent implementation of 5-G C Band transmission sought by AT&T and Verizon for their telephones. The issue for FAA is radar altimeters installed in scores of aircraft types, including commercial airlines, some business jets, and many helicopters, including helicopter air ambulances. Radio altimeters supporting these systems operate between 4.2-4.4 GHz; C-Band 5-G operations will initially begin at around 3.7 GHz.

The concerns are not merely the delays and cancelled flights potentially caused by FAA’s issuance of over 1,500 Notices to Airmen (“NOTAM”), restricting use of instrument approaches and other procedures that rely on radar altimeters, principally in bad weather, but also increased weather minimums for Part 91 helicopter operations.

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