Does the SDU battery provide backup power to NAV 1?

The option stating that the SDU battery does not provide backup power to NAV 1 is correct because the SDU (System Data Unit) battery is typically designed to power specific systems or components within a larger navigational and communication setup. In most configurations, NAV 1 is reliant on a dedicated power source that is independent of the SDU battery. This distinction is crucial because it highlights the separate roles that various power supplies play in an aircraft's systems.

The SDU battery may support other essential systems or functions, but its lack of direct power provision for NAV 1 underlines the importance of understanding each system's operation and interdependencies. Additionally, this knowledge is vital for effective troubleshooting and system reliability. Knowing that NAV 1 requires a different power source can help pilots and technicians ensure that navigation capabilities remain operational, even if the SDU battery experiences a fault.