Which component provides primary DC power from the AC sources?

Which component provides primary DC power from the AC sources?

• A. The #1 and #2 Main Generators
• B. The #1 and #2 Converters
• C. APU Generator
• D. External Power

Answer: (B)

AC power from the engines’ generators has to be turned into DC to feed the helicopter’s DC buses. The two converters do exactly that: they rectify and regulate the AC from the generators (and from external power when connected) into a stable DC output used by the aircraft systems. So, even though the generators and the APU provide the necessary AC power, the actual primary DC power from those AC sources comes through the converters. If AC is available, the converters supply the DC bus; the battery can back up DC power if needed, but the conversion from AC to DC is performed by these converters.

AC power from the engines’ generators has to be turned into DC to feed the helicopter’s DC buses. The two converters do exactly that: they rectify and regulate the AC from the generators (and from external power when connected) into a stable DC output used by the aircraft systems. So, even though the generators and the APU provide the necessary AC power, the actual primary DC power from those AC sources comes through the converters. If AC is available, the converters supply the DC bus; the battery can back up DC power if needed, but the conversion from AC to DC is performed by these converters.