Warning flags shown on an HSI indicate which condition?

Warning flags shown on an HSI indicate which condition?

• A. Inoperative
• B. Normal operation
• C. Pilot standby
• D. System fault pending

Answer: (A)

Warning flags on an HSI indicate that the information being shown may not be valid and the instrument is effectively inoperative. This happens when a data source or the instrument itself fails or loses reliable data (for example, a navigation signal loss or AHRS fault). Because the displayed heading and course information can’t be trusted, you should rely on standby instruments and address the fault, rather than trusting the HSI readout. Normal operation would not show a warning flag, and the other statuses aren’t standard indications for an HSI warning flag.

Warning flags on an HSI indicate that the information being shown may not be valid and the instrument is effectively inoperative. This happens when a data source or the instrument itself fails or loses reliable data (for example, a navigation signal loss or AHRS fault). Because the displayed heading and course information can’t be trusted, you should rely on standby instruments and address the fault, rather than trusting the HSI readout. Normal operation would not show a warning flag, and the other statuses aren’t standard indications for an HSI warning flag.