FAA Forces 5G Shield on Planes to Avoid Altimeter Chaos
Published Date: 3/21/2025
Rule
Summary
The FAA is making new rules for certain MHI RJ Aviation airplanes because their radio altimeters might get messed up by 5G signals. Pilots need to install a special filter to keep the altimeters working right and keep flights safe. This fix needs to happen soon to avoid any safety risks, but it’s a smart move to keep everyone flying smoothly.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
Prevents 5G Interference With Altimeters
This rule protects radio altimeters from interference by wireless broadband in the 3.7–3.98 GHz (5G C-Band) so altimeters can be relied on to perform their intended function. By requiring the RF bandpass filter installation on the listed MHI RJ models, the FAA aims to reduce the safety risk to pilots, crew, and passengers on those airplanes.
Mandatory RF Filter Installations
Operators of certain MHI RJ Aviation airplanes (models CL-600-2B19, CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, and CL-600-2E25) must install a radio frequency (RF) bandpass filter on the coaxial line between the radio altimeter and the receive antenna in the aft equipment compartment. The rule responds to potential interference from wireless broadband in the 3.7–3.98 GHz (5G C-Band) frequency band and requires compliance to address the unsafe condition.
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