How can an avionics bus be protected if a generator trips?

• A. By turning off all avionics
• B. Via bus ties, essential bus continuity, and standby power sources designed to keep avionics powered
• C. By increasing generator output to exceed load
• D. By switching to battery-only operation

Answer: (B)

Protecting avionics after a generator trips relies on maintaining power through redundant paths: bus ties, essential bus continuity, and standby power sources. Bus ties are protective links that can be closed to transfer power from remaining sources to the avionics bus, preventing a complete loss and allowing the system to ride through the generator fault without dropping critical packages of equipment. The essential bus continuity ensures that the most critical avionics stay energized even when one source goes offline, by providing a dedicated feed that remains powered from the surviving generators or from a dedicated essential power source. Standby power sources offer an autonomous supply to essential loads, so vital avionics continue to operate while the normal power sources are recovering or a backup takes over. This combination is what keeps avionics powered during abnormal conditions rather than turning off everything, trying to push more output from the failed generator, or relying on battery-only operation, which does not provide the required continuous, stable power for the full avionics suite.