I’m not a pilot so please excuse my ignorane. Do they teach pilots how to navigate or at least have a navigator on board? How did pilots find their way before satellites and other tech. Is navigation a lost skill?
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!
The specific claim is that 5g may interfere with the radar altimeter. That’s why the airlines are saying it may affect flights in /bad weather/, where they may have to rely on instruments to know how far above ground they are.