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What is the reason for using speech synthesizers in aircrafts?

(a) Communication with ATC

(b) Communication with another aircraft

(c) Used in flight data recorder

(d) Warning messages to pilot

I have been asked this question in semester exam.

My question comes from Control and Data Entry topic in division Displays and Man-Machine Interaction of Avionics

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Right choice is (d) Warning messages to pilot

For explanation I would say: Speech synthesizers are used to provide voiced warning messages to the pilot of system malfunctions and failures. They also aid DVI systems to provide feedback that a spoken command has been correctly recognized.

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