Which display shows localizer and glide slope deviation when NAV 1 is tuned to a valid ILS frequency?

Which display shows localizer and glide slope deviation when NAV 1 is tuned to a valid ILS frequency?

• A. PFD
• B. ND
• C. ISI
• D. EICAS

Answer: (C)

When NAV 1 is tuned to a valid ILS frequency, the localizer and glideslope deviation are shown on the Integrated Standby Instrument. This backup display is specifically designed to provide essential navigation cues, including left-right deviation from the localizer and up-down deviation from the glideslope, so you can follow the approach even if the primary displays aren’t available. The PFD mainly shows attitude and flight data, the ND is for map and navigation presentation, and EICAS handles engine and system information, none of which are dedicated to presenting ILS deviation in routine use.

When NAV 1 is tuned to a valid ILS frequency, the localizer and glideslope deviation are shown on the Integrated Standby Instrument. This backup display is specifically designed to provide essential navigation cues, including left-right deviation from the localizer and up-down deviation from the glideslope, so you can follow the approach even if the primary displays aren’t available. The PFD mainly shows attitude and flight data, the ND is for map and navigation presentation, and EICAS handles engine and system information, none of which are dedicated to presenting ILS deviation in routine use.