FAA Issues Boeing Airworthiness Directives for Canadian 5G

The Federal Aviation Administration (FAA) has issued new FAA airworthiness directive mandates requiring operators of Boeing aircraft to update their Airplane Flight Manuals (AFM) before entering Canadian airspace. This regulatory action, effective June 26, 2026, addresses risks associated with Boeing 5G interference stemming from changes to the Canada C-band spectrum environment. The Airworthiness Directives; The Boeing Company Airplanes (Docket No. FAA-2026-7208) require airlines to implement new operational limitations to ensure the safety of aircraft cockpit landing instruments.

The Shift in Canadian Spectrum Policy

The directive responds to a notification from Transport Canada regarding the removal of 5G C-band airport exclusion zones, which takes effect on July 1, 2026. Under the new Airworthiness Directives; The Boeing Company Airplanes (Docket No. FAA-2026-7203) guidelines, the FAA mandates that airlines update their flight manuals to prohibit certain operations requiring radio altimeter data in Canadian airspace unless the aircraft is equipped with interference-tolerant hardware. The affected Canadian 5G spectrum operates in the 3.45 to 3.98 GHz frequency band, which sits in close proximity to the 4.2 to 4.4 GHz band utilized by aircraft radio altimeters.

Stakeholder Impact and Operational Constraints

For US and Canadian passenger airlines, the directive introduces an immediate requirement to revise operating procedures. Carriers must either ensure their fleets are retrofitted with 5G-tolerant radio altimeters or restrict landing operations in Canada under specific low-visibility conditions. Boeing remains responsible for providing technical guidance and engineering analysis to assist operators in demonstrating interference tolerance for specific aircraft models. While Canadian Telecom Operators are now permitted to proceed with their spectrum rollout, the operational and safety burden of managing the interference environment rests entirely on the aviation sector.

Technical Context: Spectrum Proximity

Regulatory Precedents and Industry Trends

The current mandates mirror the regulatory environment observed in the United States between 2022 and 2023. During that period, the FAA issued widespread directives prohibiting low-visibility landings for aircraft lacking upgraded radio altimeters as major telecommunications providers activated their 5G networks. This historical pattern confirms that as regulators globally allow the expansion of mid-band spectrums without dedicated aviation buffer zones, operational restrictions become the primary tool for maintaining safety standards.

Why This Matters for Cross-Border Operations

The removal of exclusion zones in Canada signifies a shift in how aviation authorities manage the coexistence of telecommunications and flight operations. By mandating manual updates, the FAA is ensuring that flight crews are aware of the increased interference environment, thereby preventing reliance on compromised altimeter data during critical flight phases. This development signals that cross-border flight operations will remain subject to evolving regulatory scrutiny as 5G rollouts continue to test the limits of legacy cockpit equipment.