Beechjet 400A Computer Training Systems (CTSys) Practice Test

If No.1 inverter fails, what does No.2 inverter do?

Transfers power to the primary buses leaving the secondary buses powerless. Continues to power the secondary buses. Powers the emergency bus. Shuts down the entire system.

Correct Answer:

Transfers power to the primary buses leaving the secondary buses powerless.

Explanation:

Redundancy in the inverter power system is designed to keep essential aircraft loads alive if one inverter fails. When the first inverter goes out, the second inverter automatically takes over the primary buses to maintain power for the critical avionics and flight-control systems. The secondary buses are left powerless because the system prioritizes the primary (essential) loads and isolates the nonessential buses to prevent overloading the remaining inverter. This is why the surviving inverter transfers power to the primary buses rather than continuing to power the secondary buses or shutting down the whole system.

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