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What is the maximum altitude that can be measured using a radio altimeter?

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What is the maximum altitude that can be measured using a radio altimeter?

(a) 100ft

(b) 500ft

(c) 50 ft

(d) 5000ft

I had been asked this question in an interview.

My question is taken from Radar Altimeter topic in portion Celestial Navigation, Doppler and Altimeter Radars of Avionics

1 Answer

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Best answer
Right choice is (d) 5000ft

Easy explanation: Radio altimeters are generally used for measuring altitude during landing or take off. A radio altimeter gives the distance between the aircraft and the ground and not the pressure altitude. Maximum range of a radio altimeter is 5000ft but is usually switched to at 2500ft.

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