Noisy
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The world is being quietly rearranged by people who write very long documents.

Federal Register · March 21, 2025
The title they went with Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier Inc.) Airplanes Noisy translates that to

Regional jets must install filters to keep flying near 5G

What happened
The US aviation regulator now requires specific regional jets to install new radio filters. Without these filters, the planes' altimeters cannot reliably measure height when flying near 5G cell towers.
Why it matters
Operators of specific regional jets now face a mandatory upgrade cost to keep their planes flying. This rule is one more step in making sure older aircraft can operate safely in a world with widespread 5G wireless signals. The aviation industry has been grappling with this interference problem for years.
The signal
Watch for similar mandatory upgrade orders for other aircraft models as 5G networks expand, and for the total cost burden on regional airlines.
If you insist
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