The aviation industry is moving forward with an expedited plan to replace critical aircraft altimeters ahead of the upcoming spectrum auction deadline. Industry representatives told the Federal Communications Commission that the retrofit process could be completed by 2029 or 2030, a significant acceleration from previous estimates of 2032 to 2035. This is driven by available funding from auction proceeds and the need for manufacturing consistency, as well as regulatory support from the FAA.
The current altimeters operate in the 3.98-4.2 GHz range, and their incompatibility with the upcoming auction of the upper C-band spectrum necessitates the transition. The new standards aim to minimize interference with mobile carriers using adjacent frequencies. The total estimated costs for replacing over 58,000 units are projected between $4.5 billion and $7 billion.
Industry stakeholders, including airplane manufacturers and wireless carriers, have exchanged views. Some carriers expressed disagreement with the FAA’s safety modeling assumptions, arguing that restrictions could be eased without compromising safety, while the aviation sector supports the FAA’s approach. The process involves complex coordination, including the potential need for new satellite launches by incumbent satellite service providers.
Concerns among broadcasters and video distribution services about service continuity have also surfaced. Companies such as SES and Eutelsat have indicated that if larger portions of the spectrum are auctioned, they will need to upgrade satellites, which could take several years. The National Association of Broadcasters advocates limiting the auction to 100 megahertz to avoid service disruptions, with some entities expressing existential concerns over the loss of current frequency access.
Overall, the push for faster implementation signifies a significant shift in spectrum management and aircraft technology, aiming to balance regulatory, safety, and commercial interests.
