Preventing Spectrum Interference Another critical issue we would like to high- light is spectrum. This is another example of why HAI represents your interests before legislators and regulators, and why you need to speak out to protect your interests. In the June 2021 edition of ROTOR, we
provided an overview of the actions by the Federal Communications Commission (FCC) to repurpose spectrum adjacent to that used by some safety-related aviation
equipment, creating these effects: ■ Interference with the L band, which is used by GPS units and satellite-to-ground
communications
■ Interference with the C band, which is used by radar (radio) altimeters. As we previously reported, both the Senate and the House introduced legisla- tion, the RETAIN GPS and Satellite Communications Act (S. 2166 and H.R. 4634) to address the issue of L band–GPS interference. However, Congress hasn’t yet acted to prevent C band interference with radar altimeters.
Interference with Radar Altimeters While HAI has long been working to develop actionable mitigations to radar
altimeter interference, time is a luxury we no longer have. The deployment of 5G net- works operating in C band frequencies next to those used by radar altimeters is expected to occur on Dec. 5, 2021. HAI’s initial opposition efforts date back
to 2017 when the FCC first released a notice of inquiry about repurposing C band spectrum. As you’ll see in the graphic below, we and other aviation stakeholders have been working to address that policy’s safety implications since that time. Even though the FCC has proceeded with its plans, you shouldn’t assume that HAI’s efforts have been wasted. This is a
AUG FCC releases Notice of Inquiry about repurposing C band spectrum FALL Aviation industry files public comments outlining safety concerns
MAY HAI files public comments outlining safety concerns
JUL FCC commissioners adopt Order and Notice of Proposed Rulemaking to repurpose 3.7–4.2 GHz band for terrestrial fixed and mobile broadband use
DEC HAI and other stakeholders brief the FCC on the aviation industry’s concerns regarding harmful interference HAI and other stakeholders reiterate concerns in ex parte filing
JUL HAI advocates for measures to preserve safety-critical equipment in 5G legislation considered in Congress
NOV House Transportation Committee Chairman DeFazio sends FCC Chairman Pai a letter outlining his growing concern over the proposal to repurpose C band spectrum
FEB FCC votes 3–2 to move forward on making 280 MHz of C band spectrum available for 5G MAY HAI files petition to reconsider C band order to protect aviation safety OCT RTCA releases technical analysis documenting C band interference for radar altimeters NOV HAI briefs congressional leaders on C band interference findings from RTCA report
DEC Chairman DeFazio sends letter to FCC urging the agency to postpone spectrum auction, citing concerns from the aviation industry
FCC conducts C band auction, netting $81 billion
MAR Congressional leaders in transportation hearing question FCC and DOT on spectrum safety issues MAY HAI joins ex parte filing to FCC commissioners, disputing claims made by the wireless industry HAI asked to co-chair newly formed industry working group consisting of scores of aviation organizations
JUL HAI presents industry position at FAA Radar Altimeter and Compatibility with 5G Industry Forum HAI sends letter to DOT and DOC stressing the importance of interagency cooperation
AUG HAI presents industry position in meetings with FCC commissioners and the FCC’s Office of Engineering and Technology, Wireless Telecommunications Bureau, and International Bureau
HAI joins multiple ex parte filings further detailing concerns and proposing a path forward HAI shares key points of recent ex parte filings with congressional leaders
DEC 5G deployment begins SEPTEMBER 2021 ROTOR 11
HAI Actions to Limit 5G Interference with RADAR ALTIMETERS
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