X in the C4 space in the full Data Block indicates

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Multiple Choice

X in the C4 space in the full Data Block indicates

Explanation:
An X in the C4 field of the full Data Block is the marker for an Exceptional Vertical Rate Indicator. This tells you the aircraft is climbing or descending at a rate outside the normal range and requires extra attention from the controller to manage vertical separation or to verify the flight’s intent. A normal vertical rate wouldn’t show this indicator, and a data block error or loss of communication is signaled by different indicators or signals, not by an X in the C4 space.

An X in the C4 field of the full Data Block is the marker for an Exceptional Vertical Rate Indicator. This tells you the aircraft is climbing or descending at a rate outside the normal range and requires extra attention from the controller to manage vertical separation or to verify the flight’s intent. A normal vertical rate wouldn’t show this indicator, and a data block error or loss of communication is signaled by different indicators or signals, not by an X in the C4 space.

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