Federal Register #FAA-2026-7202

FAA Airworthiness Directive: Boeing 747-8, 777, and 787 Series Flight Manual Revisions for 5G Interference in Canadian Airspace

The Federal Aviation Administration (FAA) has issued an airworthiness directive (AD) for Boeing 747-8, 747-8F, 777 series, and 787 series airplanes due to safety concerns in Canadian airspace. - Government Buyer: - Federal Aviation Administration (FAA), U.S. Department of Transportation - OEM Highlight: - The Boeing Company is the only OEM referenced - Requirement Overview: - No procurement of goods or services; this is a regulatory/procedural mandate - Operators must revise the Airplane Flight Manual (AFM) for affected Boeing models - The revision prohibits certain operations in Canadian airspace that require radio altimeter data for non-radio altimeter tolerant airplanes - The directive addresses risks from 5G Lower C-Band (3.7-3.98 GHz) wireless broadband interference, which can impact radio altimeter performance and related flight systems - Modifications to make airplanes radio altimeter tolerant will remove these limitations - Products/Services: - No specific products, part numbers, or purchase quantities are requested - The only service is the procedural revision of the AFM - Notable Requirements: - Applies to all Boeing 747-8, 747-8F, 777-200, -200LR, -300, -300ER, 777F, and 787 series airplanes operating in Canadian airspace - Interim action; further rulemaking possible depending on changes in the Canadian 5G environment

Description

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747-8 and -8F series airplanes and Model 777-200, -200LR, -300, -300ER, and 777F series airplanes. This AD addresses interference issues with radio altimeters caused by wireless broadband operations in the 3.7-3.98 GHz frequency band (5G Lower C-Band) while operating in Canadian airspace. The interference may affect multiple airplane systems using radio altimeter data, including pitch control laws and tail strike protection. The AD requires revising the airplane flight manual to incorporate limitations prohibiting certain operations requiring radio altimeter data when operating in Canadian airspace to mitigate the unsafe condition.

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