If the ND NAV selector is positioned to the ILS position, the _________ will display on your ND

If the ND NAV selector is positioned to the ILS position, the _________ will display on your ND

• A. GPS data
• B. opposite ILS radio
• C. active ILS radio
• D. VOR indicator

Answer: (B)

The NAV selector on the Navigation Display determines what navigation data the ND will show. When you set it to ILS, the ND presents the ILS information from the opposite ILS radio (the other ILS receiver), not the one currently guiding the aircraft. This provides you with a cross-check of the ILS signals—localizer and glideslope—from the secondary ILS receiver—so you can monitor both sources and verify the approach signals. If the selector were in GPS or VOR/LOC, you’d see GPS data or VOR/LOC data accordingly, rather than ILS data.

The NAV selector on the Navigation Display determines what navigation data the ND will show. When you set it to ILS, the ND presents the ILS information from the opposite ILS radio (the other ILS receiver), not the one currently guiding the aircraft. This provides you with a cross-check of the ILS signals—localizer and glideslope—from the secondary ILS receiver—so you can monitor both sources and verify the approach signals. If the selector were in GPS or VOR/LOC, you’d see GPS data or VOR/LOC data accordingly, rather than ILS data.