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Radio altimeter - why not 0 on ground

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Hello,I was wandering, why Radio Altimeter is not 0 on the ground, but 5-6. The same is while landing, PNF says 50...40...30...20...10 and saying 10 the plane is 4-5 feet up a runway. Why? Is it possible to calibrate Radio Alt.?Michal Pierzchala

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