If a dual converter failure occurs, which busses would be without power?

If a dual converter failure occurs, which busses would be without power?

• A. Main AC busses
• B. #1 and #2 DC primary busses
• C. Battery bus
• D. Essential DC bus

Answer: (B)

Power to the DC primary busses on the UH-60S comes from AC-to-DC converters tied to the engine generators. Those two converters provide redundant paths to feed the #1 and #2 DC primary busses. If both converters fail, there’s no DC supply path for those two busses, so they go dark. The main AC busses stay powered as long as the generators are producing AC, and the battery and essential DC bus have their own separate power sources, so they can continue to provide power to their respective loads. In short, a dual converter failure leaves the #1 and #2 DC primary busses without power.

Power to the DC primary busses on the UH-60S comes from AC-to-DC converters tied to the engine generators. Those two converters provide redundant paths to feed the #1 and #2 DC primary busses. If both converters fail, there’s no DC supply path for those two busses, so they go dark. The main AC busses stay powered as long as the generators are producing AC, and the battery and essential DC bus have their own separate power sources, so they can continue to provide power to their respective loads. In short, a dual converter failure leaves the #1 and #2 DC primary busses without power.