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What is the surveillance range of a general TCAS system?

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What is the surveillance range of a general TCAS system?

(a) 30 sec

(b) 20 min

(c) 2 min

(d) 4 min

This question was posed to me in an interview.

This question is from Traffic Alert, Collision Avoidance System & Weather Radar topic in division Surveillance Systems, Mapping and Multimode Radars of Avionics

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The correct option is (d) 4 min

The best I can explain: The range of a general TCAS system is around 4 minutes before collision. At 45 seconds before collision TCAS gives traffic advisory and at 25 seconds before collision provides resolution advisory.

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