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What is the main weakness of the ILS system?

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What is the main weakness of the ILS system?

(a) Less power

(b) Less range

(c) More noise

(d) Environment sensitivity

This question was addressed to me in an internship interview.

My question is based upon Microwave Landing System in chapter Landing Systems & Air-Traffic Management of Avionics

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Right option is (d) Environment sensitivity

Explanation: The main weakness of the ILS system was its sensitivity towards the environmental factors. Since the frequency used by the system is in MHz, it was more susceptible to atmospheric and weather interference.

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