FAA Final Rule Sets Radio Altimeter Standards for 5G C-Band

The FAA announced on July 22, 2026, a final rule mandating next-generation performance standards for aircraft radio altimeters, permanently resolving a multi-year conflict over 5G C-band interference.

Scheduled for publication in the Federal Register on July 24, 2026, the regulations replaces temporary operational restrictions with permanent equipment standards. The rule aligns with an FCC plan to auction 160 megahertz of new Upper C-band spectrum for 5G networks, a mandate established by the One Big Beautiful Bill Act signed by President Donald Trump in July 2025.

Regulatory coordination and financial incentives

Following a Notice of Proposed Rulemaking issued on January 7, 2026, the final rule requires aircraft to be equipped with radio altimeters capable of withstanding interference from neighboring 5G wireless signals. These systems are critical for providing exact height measurements during low-visibility landings.

The aviation industry faces an estimated $4.49 billion retrofit cost to upgrade the affected equipment. To offset this financial burden, the FCC Report and Order includes a rebate program funded by the upcoming spectrum auction proceeds.

In a press release, the FAA stated that the regulation provides technical and schedule certainty to potential 5G auction bidders. The agency noted that the FCC requirements for a radio-altimeter rebate program will provide financial incentives for the aviation community to hold to the altimeter-upgrade schedule.

Airlines for America (A4A) supported the regulatory resolution. The organization stated that the FCC final order reflects the dedicated work that the agency, the FAA, and the aviation and telecommunications industries have been doing to ensure the US remains the global leader in the wireless and aerospace industries.

Implementation timeline and safeguards

The FCC is scheduled to auction the 160 megahertz of Upper C-band spectrum in July 2027. The deployment of new wireless services using this spectrum is tied directly to the aviation compliance schedule to prevent operational disruptions.

By December 2030, new wireless services will be permitted to begin in the 75 largest US markets. This date aligns with the first deadline for scheduled air carriers to complete their altimeter upgrades. A second compliance deadline follows in July 2031 for other affected aircraft, at which point wireless services can expand to remaining markets.

The FCC rule includes specific safeguards to protect aviation operations during and after the transition. These measures include limiting the power of the auctioned 5G signals, establishing a buffer band to protect the altimeter frequencies, and restricting the height of 5G transmission towers.

The FAA confirmed that as a result of this coordination and years of testing, the agency is confident that aviation can safely coexist with expanded wireless access.

AirPro News analysis

This final rule marks the end of a chaotic period of ad-hoc mitigations that began in early 2022. Previous stopgap measures, including temporary deferrals, power limits, and buffer zones around runways, created operational uncertainty for airlines and telecommunications providers alike. By tying the aviation upgrade schedule directly to telecommunications auction proceeds through a rebate program, regulators have engineered a pragmatic compromise. We view the December 2030 and July 2031 deadlines as ambitious but achievable, provided the aerospace supply-chain for next-generation radio altimeters can support the required volume of retrofits across the commercial fleet.

Sources: Federal Aviation Administration