FAA restricts select US aircraft operations in Canada over 5G interference concerns

The US Federal Aviation Administration (FAA) has announced operational limitations for certain US-registered transport aircraft when flying in Canada, effective from 1 July. This move follows safety concerns about potential interference from 5G cellular signals affecting aircraft systems near Canadian airports. The FAA issued multiple airworthiness directives (ADs) on 30 June to address these risks, impacting roughly 1,000 US-registered aircraft.

The specific focus lies on aircraft using radio altimeters, which can be vulnerable to interference from the 5G C-band spectrum newly activated in proximity to many Canadian airports. The FAA's directives outline flight restrictions and procedural adjustments to mitigate these risks, aiming to preserve safe landing and low-altitude operations in affected Canadian airspace. Operators must comply with these directives when planning cross-border flights involving these aircraft types.

Background concerns about 5G interference surfaced as Canadian telecom companies began deploying enhanced cellular networks using frequencies close to those used by aviation safety equipment. The FAA’s precautionary directives mirror cautious steps taken by other authorities globally, emphasizing the critical importance of maintaining integrity in avionics relying on precise radio altimeter data.

This development impacts a segment of the US corporate and commercial transport fleet that regularly operates north of the border. While the FAA has not banned these flights outright, the imposed restrictions are designed to prevent unsafe scenarios potentially caused by 5G signal interference with key navigation and landing systems.

The long-term resolution of this issue will depend on ongoing coordination between aviation regulators, aircraft manufacturers, and telecom providers to establish robust technological and regulatory safeguards. For now, operators need to adjust their flight planning to comply fully with the FAA's directives, ensuring the continued safety of flights between the US and Canada.

Industry observers will closely monitor how these restrictions affect operations and whether further adjustments arise as 5G deployment evolves. The FAA’s actions underscore the delicate balance between advancing telecommunications infrastructure and preserving critical aviation safety functions.