FAA Urges Airlines to Update Radio Altimeters

By Leslie Stimson, Inside Towers Washington Bureau Chief

UPDATE The FAA is urging airlines to retrofit or replace older radio altimeters that receive transmissions from outside their authorized frequencies — specifically 5G signals on the nearby C-band. The FAA met Wednesday with telecom and airline industry officials, reports Reuters. Radio altimeters are authorized to use the 4.2 to 4.4 GHz band, while 5G C-band licenses are for 3.7 to 3.98 GHz. Some older altimeters can’t filter out the C-band emissions. Continue Reading