During normal operation, to what position should the Inverter selector switch be set?

During normal operation, to what position should the Inverter selector switch be set?

• A. ON
• B. AUTO
• C. OFF
• D. MANUAL

Answer: (B)

Automated control of the inverter is used in normal flight so the system can respond without pilot intervention. When the inverter selector is in AUTO, the inverter monitors the aircraft’s power situation and will start to supply AC power to the essential bus if the primary sources (engine generators or the normal AC supply) aren’t providing power, and it will stay off or idle when those sources are available. This gives seamless backup power for critical equipment while avoiding unnecessary running of the inverter. The other settings would either keep the inverter running all the time (ON), disable it completely (OFF), or require manual start/stop (MANUAL), which isn’t desirable for routine operation or automatic power transfer.

Automated control of the inverter is used in normal flight so the system can respond without pilot intervention. When the inverter selector is in AUTO, the inverter monitors the aircraft’s power situation and will start to supply AC power to the essential bus if the primary sources (engine generators or the normal AC supply) aren’t providing power, and it will stay off or idle when those sources are available. This gives seamless backup power for critical equipment while avoiding unnecessary running of the inverter.

The other settings would either keep the inverter running all the time (ON), disable it completely (OFF), or require manual start/stop (MANUAL), which isn’t desirable for routine operation or automatic power transfer.