What voltage does the standby inverter provide to essential loads?

What voltage does the standby inverter provide to essential loads?

• A. 115V AC.
• B. 28V DC.
• C. 400 Hz AC.
• D. 28V AC.

Answer: (A)

Standby inverter delivers 115V AC to essential loads. This voltage is the standard for the aircraft’s essential bus, and the inverter provides it in AC (at the 400 Hz frequency the system uses) when the normal generators or AC sources aren’t available. The other options don’t fit because the inverter produces AC, not DC, and 28V (DC or AC) isn’t the required essential-bus voltage. The key idea is that essential equipment expects 115V AC, so the standby inverter supplies that until normal power is restored.

Standby inverter delivers 115V AC to essential loads. This voltage is the standard for the aircraft’s essential bus, and the inverter provides it in AC (at the 400 Hz frequency the system uses) when the normal generators or AC sources aren’t available. The other options don’t fit because the inverter produces AC, not DC, and 28V (DC or AC) isn’t the required essential-bus voltage. The key idea is that essential equipment expects 115V AC, so the standby inverter supplies that until normal power is restored.