In a conventional ADI, which item might appear as a warning flag related to navigation?

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Multiple Choice

In a conventional ADI, which item might appear as a warning flag related to navigation?

Explanation:
Warning flags on a conventional ADI indicate when a navigation input is unreliable or unavailable. Among navigation-related sources, the localizer is the one tied to a specific nav signal used for instrument approaches. If the localizer signal is lost or out of tolerance, the ADI can display a warning flag to alert you that the navigation data tied to that signal should not be trusted for guidance. The other options are not navigation signals: BARO relates to altitude reference, OAT to outside air temperature, and N1 to engine parameter. They are monitored by other instruments, not by a navigation warning flag on the ADI.

Warning flags on a conventional ADI indicate when a navigation input is unreliable or unavailable. Among navigation-related sources, the localizer is the one tied to a specific nav signal used for instrument approaches. If the localizer signal is lost or out of tolerance, the ADI can display a warning flag to alert you that the navigation data tied to that signal should not be trusted for guidance. The other options are not navigation signals: BARO relates to altitude reference, OAT to outside air temperature, and N1 to engine parameter. They are monitored by other instruments, not by a navigation warning flag on the ADI.

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