Red X on the SFI attitude, altitude, or heading display indicates which Emergency Procedure?

Red X on the SFI attitude, altitude, or heading display indicates which Emergency Procedure?

• A. ICU Failure
• B. SFI Failure
• C. LPCAP Failure
• D. Hydraulic Indicating System Failure

Answer: (B)

A red X on the SFI attitude, altitude, or heading display means the Standby Flight Instrument data is invalid or the instrument has failed. The SFI is the backup reference that provides attitude, altitude, and heading when the primary flight instruments aren’t reliable. When the display shows a red X, you cannot rely on that data, so you switch to other references (like the standby attitude indicator or magnetic compass) and follow the SFI Failure emergency procedure to maintain situational awareness and control. Other system failures have separate warning indicators and would not present as a red X on the SFI display itself.

A red X on the SFI attitude, altitude, or heading display means the Standby Flight Instrument data is invalid or the instrument has failed. The SFI is the backup reference that provides attitude, altitude, and heading when the primary flight instruments aren’t reliable. When the display shows a red X, you cannot rely on that data, so you switch to other references (like the standby attitude indicator or magnetic compass) and follow the SFI Failure emergency procedure to maintain situational awareness and control. Other system failures have separate warning indicators and would not present as a red X on the SFI display itself.