The FAA proposes a February 1, 2024 deadline for airlines to replace or retrofit altimeters that can't filter out 5G signals, preventing full C-Band deployment
Jon Brodkin / Ars Technica :
Context & Ripple Effects
This proposal is the FAA converting two years of improvised truces into a fixed schedule. The standoff began when the agency outlined flight restrictions around automated landing systems ahead of the January 5, 2022 C-Band launch, then leaned on Verizon and AT&T, who agreed to delay some C-Band usage until July 2023 while airlines retrofitted altimeters.
Since then the pressure has only mounted: Transportation Secretary Pete Buttigieg warned of air travel disruption ahead of a July 1 cutoff for airlines to retrofit equipment or face restrictions. A hard February 1, 2024 deadline is the FAA's answer to the unresolved FCC-versus-FAA disagreement over aircraft risk — forcing the equipment side of the dispute rather than renegotiating the spectrum side.
First-order effects
- Airlines still flying altimeters that cannot filter 5G signals now have a firm compliance date, with the implied alternative being operational restrictions rather than another carrier-negotiated delay.
- Verizon and AT&T get a defined endpoint to the phased C-Band deployment they agreed to in 2022, replacing rolling extensions with a date tied to airline fleet readiness.
Second-order effects
- Carriers that miss the deadline would push interference risk back onto the wireless operators' deployment plans, recreating the dynamic where AT&T and Verizon absorb schedule costs for airline retrofit lag.
- Avionics retrofit demand concentrates in the window before February 2024, giving altimeter makers and MRO shops pricing leverage over airlines racing a regulator-set clock.
Third-order effects
- If the pattern holds, spectrum rollouts near airports will be governed by mandatory equipment deadlines rather than indefinite operating restrictions — a structural win for the FCC's deployment agenda inside its long-running turf dispute with the FAA.
- The retrofit-or-restrict model sets a template for future RF-interference conflicts between aviation safety regulators and telecom deployment, shifting bargaining power from ad hoc carrier agreements to rulemaking.
The trend: US spectrum deployment is increasingly sequenced around aviation equipment retrofits, with the FAA trading temporary carrier delays for hard airline compliance deadlines.