On an HSI, if NAV, HDG, or GS flags are displayed, what does that indicate about the corresponding function?

On an HSI, if NAV, HDG, or GS flags are displayed, what does that indicate about the corresponding function?

• A. The function is active
• B. The indicator is malfunctioning
• C. Data is being updated
• D. That function is inoperative

Answer: (C)

When an HSI shows NAV, HDG, or GS flags, the indicator is signaling that the data for that function is in the process of being updated. The system is refreshing or loading new information from the source, so the current data may not yet be stable for navigation use. Once the update completes, the flag typically disappears and the function behaves as normal. This is different from indicating a fault or an inoperative state; those situations would show a fault indication or no data rather than an updating flag.

When an HSI shows NAV, HDG, or GS flags, the indicator is signaling that the data for that function is in the process of being updated. The system is refreshing or loading new information from the source, so the current data may not yet be stable for navigation use. Once the update completes, the flag typically disappears and the function behaves as normal. This is different from indicating a fault or an inoperative state; those situations would show a fault indication or no data rather than an updating flag.