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Wed, 3 May 2023

IATA Welcomes Agreement to Extend 5G C-Band Mitigations

(03/05/23)  IATA has welcomed the agreement by AT&T Services, T-Mobile, UScellular and Verizon to extend until 1 January 2028 the voluntary mitigation measures for 5G C-band transmissions at 188 US airports.

The measures, which were put in place in January 2022, concurrent with the rollout of 5G C-band operations at or near US airports, include lowering the power of 5G transmissions and had been set to expire 1 July 2023.

However, while the agreement is a welcome stop-gap development, it is by no means a solution. The underlying safety and economic issues around 5G C-band deployments by telecommunications services providers (telcos) remain.

“Airlines did not create this situation. They are victims of poor government planning and coordination,” said Nick Careen, IATA’s Senior Vice President Operations, Safety and Security. “Industry concerns about 5G, expressed for many years in the appropriate forums, were ignored and over-ridden. Half-measure solutions have been foisted upon airlines to implement at their own expense and with little visibility into their long-term viability. This extension is an opportunity for all stakeholders, including telcos, government regulators, airlines and equipment manufacturers, to work together for a fair and equitable solution.”

Communications tower. Picture by Steven Howard of TravelNewsAsia.com Click to enlarge.
Communications tower. Picture by Steven Howard of TravelNewsAsia.com

The activation of 5G C-band operations in January 2022 threatened enormous disruption to the US air transport system because of the potential risk of interference with aircraft radio altimeters (radalts) that also use C-band spectrum and are critical to aircraft landing and safety systems.

The issue was only addressed at the eleventh hour when AT&T and Verizon agreed to a voluntary power limit for 5G C-band transmissions near airports.

Even with that agreement, however, the continuing risk of interference with aircraft radalts was seen as so significant by the Federal Aviation Administration (FAA) that airlines were only permitted to operate at affected airports in low visibility (Category 2 and Category 3) conditions through one of two methods:

- Alternative Means of Compliance (AMOC) under which avionics and aircraft original equipment manufacturers (OEMs) establish that specific aircraft / radalt combinations provide sufficient resilience against interference to continue to utilize low visibility landing procedures at the affected airports.

- Modifying existing radalts or replacing them with newer models at their own expense, to enable unrestricted operations at agreed 5G power levels.

In May 2022, the FAA informed airlines that, as of 1 July 2023 the AMOC process would end. In its place, a blanket requirement defining a minimum performance level for radalts for low visibility landing procedures was to be established.

Radalts not meeting the minimum performance level would have to be replaced or upgraded at airline expense with the cost of fleet-wide radalt upgrading estimated at more than $638 million.

Several airlines began the radalt upgrade process shortly after the May 2022 communication from the FAA, even though the FAA did not issue a formal notice of proposed rulemaking until January 2023. Even then, supply chain issues make it unlikely that all aircraft can be upgraded by the 1 July deadline, threatening operational disruptions during the peak northern summer travel season.

The latest agreement by the telcos to defer until January 2028 full power-up of 5G C-band transmissions near airports buys time but does not address underlying issues.

The retrofits required by 1 July 2023 are a temporary fix as they are not sufficiently resilient in the face of full power 5G C-band transmissions. New 5G tolerant radalt standards are being developed but are not expected to be approved before the second half of 2024. Following that, radalt makers will begin the lengthy process to design, certify and build the new devices for installation in thousands of existing aircraft, as well as for all new aircraft delivered between now and 2028. Four-and-a-half years is a very tight timeframe for the scale of this undertaking.

“Many airlines have indicated that despite their best efforts they will not meet the 1 July deadline owing to supply chain issues. But even for those that do, these investments will bring no gains in operating efficiency,” said Careen. “Furthermore, this is only a temporary holding action. Under current scenarios, airlines will have to retrofit most of their aircraft twice in just five years. And with the standards for the second retrofit yet to be developed we could easily be facing the same supply chain issues in 2028 that we are struggling with today. This is patently unfair and wasteful. We need a more rational approach that does not place the entire burden for addressing this unfortunate situation on aviation.”

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