Boeing 747-8 System Practice Exam 2026 – Comprehensive Test Prep

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Which CDU tunes the center ILS?

Left CDU

Right CDU

Center CDU

The three CDUs are each tied to a corresponding flight management computer, and each one handles navigation data for its own side of the system. The center ILS is associated with the center FMC, so tuning it is done through the center CDU. The left CDU handles the left FMC and its nav data, while the right CDU handles the right FMC. Therefore, only the center CDU tunes the center ILS.

All CDUs

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