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In a very low visibility approach. gives very precise information on the relative distance between the aircraft and the ground. >> reporter: the airlines, concerned that signals from 5g towers near airports will interfere with ray dr altimeters readings in the cockpit. >> if it fails in low visibility, what happens? >> if a radar altimeter fails in low visibility, you better do a go-around right away or youre in trouble. >> reporter: airline ceos also concerned about the ripple effects, how the ...