It seems to me that this is 100% FCC responsibility and 0% designers/users of radar altimeters. The FCC got greedy selling spectrum which meant exactly what to the average taxpayer, airline passenger or cell phone user? Not a darn thing!
Yep. And again, whatever the situation, this is FCC's duty to make sure frequency allocation will be safe for existing installations, especially when it comes to safety-critical ones.
Does anyone (except a few apparently) here know how long and how complicated it is to get avionics/air navigation systems certified? How could the FCC ignore that?
It sure came under a lot of pressure, seeing how so many large telecom companies and governments were so eager to deploy 5G. But when you're responsible, you are supposed to handle pressure properly. Oh, and 6G is coming too. It's going to be a lot of fun.
Not saying that the FAA has 0 responsibility in this either, at least considering that it seems to have been a bit too "careless" these days...