Airworthiness DirectiveEASA AD US-2026-13-16

Navigation - 5G C-Band wireless Broadband Interference with Radio Altimeter System when operating in Canadian airspace - Amendment

Published: Jul 1, 2026
Effective: Jul 1, 2026

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of Boeing Model 757 and Model 767 airplanes must revise their airplane flight manuals to incorporate the new limitations prohibiting certain radio altimeter-dependent operations in Canadian airspace. Compliance with this directive is required by July 1, 2026. Additionally, operators may consider upgrading radio altimeters to models demonstrating tolerance to 5G emissions as specified by Transport Canada to potentially terminate these operating limitations.

Summary

The Navigation - 5G C-Band wireless Broadband Interference with Radio Altimeter System when operating in Canadian airspace - Amendment is a Federal Aviation Administration (FAA) airworthiness directive addressing interference issues affecting Boeing Model 757 and Model 767 airplanes. This directive responds to increased 5G Lower C-Band interference in Canadian airspace that compromises radio altimeter reliability and affects critical airplane systems during approach, landing, and go-around phases. It mandates revisions to the airplane flight manual to restrict certain operations relying on radio altimeter data when operating in Canadian airspace.

What changed

This amendment introduces new operating limitations for Boeing 757 and 767 airplanes specifically for Canadian airspace due to changes in 5G Lower C-Band interference mitigation by Canadian authorities. It requires updating the airplane flight manual to prohibit certain operations that depend on radio altimeter data in Canadian airspace, reflecting the removal of previous protection zones and changes in 5G base station emissions. These limitations are similar to those previously applied in the contiguous U.S. but tailored to the Canadian 5G environment.

Why it matters

This directive is critical for aviation professionals because it addresses a safety risk where 5G interference can degrade radio altimeter performance, increasing flightcrew workload and potentially reducing safe flight and landing capabilities. Operators and maintenance teams must ensure compliance to avoid unsafe conditions during critical flight phases in Canadian airspace. Understanding and implementing these limitations helps maintain operational safety and regulatory compliance amid evolving 5G wireless deployments.

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