“Radar altimeters are deployed on tens of thousands of civil aircraft in the United States and worldwide to support several critical safety-of-life aircraft functions throughout multiple phases of flight. Radar altimeters are the only sensor onboard a civil aircraft which provides a direct measurement of the clearance height of the aircraft over the terrain or other obstacles.”
The group’s request to suspend the auction is rooted in findings from an RTCA study on the impact of C-band mobile telecommunications interference on low range radar altimeter operations. The study revealed that 5G telecommunications systems in the 3.7–3.98 GHz band will cause harmful interference to radar altimeters on all types of civil aircraft—including large commercial transport airplanes; business, regional, and general aviation airplanes; and both transport and general aviation helicopters. Without appropriate mitigations, such interference could lead to catastrophic failures. The study was submitted to the FCC for consideration back in October and additional information was provided to the FCC today.
The aviation associations signing onto the letter to the FCC Commissioners include: Aerospace Industries Association; Airborne Public Safety Association; Air Line Pilots Association, International; Aircraft Electronics Association; Aircraft Owners and Pilots Association; Airlines for America; Cargo Airline Association; Experimental Aircraft Association; General Aviation Manufacturers Association; Helicopter Association International; National Air Carrier Association; National Air Transportation Association; National Business Aviation Association; RTCA and Regional Airline Association.