The altimeters are used by the auto pilot, especially in bad weather. In the cockpit the altimeter would probably give obviously false readings, but in that ca

The altimeters are used by the auto pilot, especially in bad weather. In the cockpit the altimeter would probably give obviously false readings, but in that case the plane can't land and has to divert. It is possible the interference could cause the radar to give a plausible but incorrect reading, but this is a worst case and to my (limited!) understanding, remote possibility.