What occurs on the HUD RCP if RADAR altitude is selected but RALT is unavailable?

What occurs on the HUD RCP if RADAR altitude is selected but RALT is unavailable?

• A. The RALT container remains visible
• B. The BARO scale appears and RALT container goes blank
• C. The system provides a warning sound
• D. Only basic altitude is displayed

Answer: (B)

When RADAR altitude is selected but RALT (radar altimeter) data is unavailable, the HUD (Heads-Up Display) RCP (Right Control Panel) behaves in a specific manner to indicate this condition. The situation leads to the BARO scale being displayed, which represents the barometric altitude as a fallback. Since the radar altimeter data is not available, the RALT container, which normally shows the radar altitude, goes blank. This provides pilots with a clear indication that while the system is ready for barometric altitude measurements, it cannot provide the radar altitude, thereby ensuring situational awareness during flight operations. Understanding the display behavior in different scenarios is crucial for pilots, as it helps them adapt to the available information and maintain safety standards. The BARO scale's appearance is a standard procedure to inform the crew about the transition from radar altitude to barometric altitude.

When RADAR altitude is selected but RALT (radar altimeter) data is unavailable, the HUD (Heads-Up Display) RCP (Right Control Panel) behaves in a specific manner to indicate this condition. The situation leads to the BARO scale being displayed, which represents the barometric altitude as a fallback. Since the radar altimeter data is not available, the RALT container, which normally shows the radar altitude, goes blank. This provides pilots with a clear indication that while the system is ready for barometric altitude measurements, it cannot provide the radar altitude, thereby ensuring situational awareness during flight operations.

Understanding the display behavior in different scenarios is crucial for pilots, as it helps them adapt to the available information and maintain safety standards. The BARO scale's appearance is a standard procedure to inform the crew about the transition from radar altitude to barometric altitude.