FCC Proposes Standardized Rebates for Aircraft Radio Altimeter Upgrades Ahead of Upper C-Band Wireless Use

The Federal Communications Commission is seeking public comment on proposed rebates for aircraft owners and operators who must upgrade radio altimeters ahead of expanded wireless operations in the Upper C-band. The notice was originally released October 5 and was published in the Federal Register on Monday. It describes a payment system funded by wireless spectrum licensees.

Under the proposal, eligible owners would receive standardized rebates based on three factors: aircraft category, the number of installed radio altimeters, and the complexity of the required modifications. The FCC chose predetermined payments over reimbursement of actual expenses, saying this would simplify administration and reduce disputes over individual claims. The agency's Wireless Telecommunications Bureau is asking for comment on the draft rebate categories and dollar amounts, as well as the assumptions and methodology behind them.

The rebates are meant to help operators comply with the FAA's final rule, published over the summer. It requires affected Part 121 airliners and certain large foreign-operated aircraft to meet new interference-tolerance standards by December 30, 2030. Other radio-altimeter-equipped aircraft, including those operating under Part 91, must comply by October 31, 2034. The requirements follow the FAA's earlier proposal addressing potential interference from wireless signals operating near frequencies reserved for aviation radio altimeters.

Rebate eligibility for Part 91 aircraft would be limited to qualifying U.S.-registered aircraft that received their original airworthiness certificates before July 1, 2031. The FCC is considering using maintenance records and other documentation to verify completed upgrades. Initial comments are due October 26, with reply comments due November 16.

Radio altimeter retrofits are a compliance cost that lands on aircraft owners, while the interference that forces them originates with a different industry. A rebate funded by wireless licensees moves part of that cost back toward the parties who gain the spectrum, and a standardized schedule makes the amount knowable before an owner commits to a shop slot. For fleets and private owners, that turns a open-ended retrofit expense into something that can be budgeted against a published table.

A flat payment per category works differently from cost reimbursement. Owners whose actual work is cheaper than the scheduled amount come out ahead, and owners with complex installations may find the schedule falls short. The weight therefore sits on the dollar figures and the complexity tiers, which is exactly what the FCC has put out for comment. The two compliance dates, 2030 for airliners and 2034 for other aircraft, leave Part 91 owners a long runway, but the July 1, 2031 airworthiness-certificate cutoff means aircraft certificated after that date would fall outside the Part 91 rebate.

The next milestones are the October 26 initial comment deadline and the November 16 reply deadline, when avionics shops, operator associations and the wireless licensees can be expected to argue over the category amounts and the documentation needed to prove an upgrade was completed. How the final schedule treats multi-altimeter and heavily modified aircraft will show whether standardized payments hold up across very different fleets.