N1120A wrote:USAirKid wrote:Realistically it’s between the airlines and the radio altimeter suppliers. The suppliers built something non compliant, and the airlines are the ones who are affected. It’s just that they’ve been getting away with it for years.
Well, not exactly. 5G in the problematic spectrum is a relatively new thing. That said, this technology has worked safely and without interference for decades. The FCC and the telecoms are really the ones at fault here.
Nah. The radio altimeters have always been non-compliant, they just didn't have a neighbor until now that highlighted how they are non-compliant. The FCC has also given a fairly wide guard band between where the radio altimeters are supposed to operate and the 5G mobile operators band, and it still is an issue for the radio altimeters.
If this were property, it someone who built their home on the property line, then gets upset that when the city got around to selling the lot next to their property. When that property is built on they complain that "their" trees are torn down, because they were never on their property to begin with, and the verdant view is now a wall of a new home.
Radio altimeters went into planes designed in the 1990s were of technology of the 1960s, although by 1990s it could be reasonably predicted that radio spectrum would be in demand, and you should be staying in your allotted space. To top it off, the air framers, altimeter manufacturers, and airlines didn't take the issue seriously until the last moment, instead opting to try to get a series of unending extensions.
This sucks for the airlines, and they should lean on the air framers and altimeter manufacturers hard, upto and including legal action for delivering equipment that was not legal to operate in the US.