What is the primary source of AC power?

What is the primary source of AC power?

• A. External power
• B. The #1 and #2 main generators
• C. APU generator
• D. DC converters

Answer: (B)

In normal operation the AC electrical power on a UH-60S comes from the engines-driven generators. Each engine powers a main generator, and together they provide the required AC power for avionics, flight controls, lights, and other systems. External power is only used on the ground when you’re plugged into a ground power unit, not during flight. The APU generator can supply AC power when the engines aren’t producing enough or when extra power is needed, but it’s auxiliary, not the primary source. DC converters don’t generate AC themselves; they handle DC power and feed other parts of the electrical system, while the main generators (the engine-driven ones) are the primary source of AC power.

In normal operation the AC electrical power on a UH-60S comes from the engines-driven generators. Each engine powers a main generator, and together they provide the required AC power for avionics, flight controls, lights, and other systems. External power is only used on the ground when you’re plugged into a ground power unit, not during flight. The APU generator can supply AC power when the engines aren’t producing enough or when extra power is needed, but it’s auxiliary, not the primary source. DC converters don’t generate AC themselves; they handle DC power and feed other parts of the electrical system, while the main generators (the engine-driven ones) are the primary source of AC power.