The FAA is mandating that all radio altimeters on commercial aircraft meet interference-tolerant performance standards by December 2030 to protect aviation safety as the FCC opens the Upper C-band (3.98-4.2 GHz) for terrestrial wireless services.
| Signal type | regulatory_update |
|---|---|
| Strategic importance | medium |
| Countries | United States |
Primary source: https://www.federalregister.gov/documents/2026/07/31/2026-15585/requirements-for-interference-tolerant-radio-altimeter-systems
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