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How is altitude measured when the aircraft is about to land?

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How is altitude measured when the aircraft is about to land?

(a) Pitot static port

(b) Pitot stagnation port

(c) Radio altimeters

(d) Inertial navigation systems

The question was asked in semester exam.

My enquiry is from ILS/MLS Coupled Landing System and Automatic Landing topic in chapter Autopilots and Flight Management Systems of Avionics

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Correct answer is (c) Radio altimeters

The explanation: When an aircraft is about to land, accurate altitude measurements are needed. Pitot static measurements suffer from errors due to weather and generally have lag. The aircraft height above the ground is measured by very accurate radio altimeters during the landing phase.

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