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Navigational functions are no longer available if the INS shuts down in an FMS.(a) True(b) FalseI had been asked this question by my college professor while I was bunking the class.This is a very interesting question from Flight Management Systems in portion Autopilots and Flight Management Systems of Avionics

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Right OPTION is (a) True

Explanation: The FMS AIRCRAFT POSITION always uses the inertial position. This computation is not possible if the inertial position is not valid, and in this case, all the FMS NAVIGATION and flight planning functions are no longer available. FBW system also fails in the case of an INS shut down since it uses INS for feedback.



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