In simplest terms the radar altimeter provides data to mulitple aircraft systems during a landing. Picture coming in to an airport day or night, rainy or snowy or whatever not so good condition you can think of to obscure the runway... If the "5G" interferes with the radar altimeter operation in any way to mess up what it is providing the aircraft systems to do their job... what can happen? You can almost look at it as a "denial of service" to the aircrafts systems during a landing approach. WHY - is the big question of the day - WHY will they not run in test aircraft after they turn the 5G on for the first approaches to the air fields? Do they want to finish off the airline industry for more "control?" Butt, don't worry Pete Buttijudge is Transportation sexretary!
“WHY will they not run in test aircraft after they turn the 5G on for the first approaches to the air fields?”
Mostly a non-issue. Don’t get triggered.
“Do they want to finish off the airline industry for more “control?”
Airlines wrote the letter.