EXT PWR energized when no GPU
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In MSFS, ground power is always available when you are parked at a known parking location, and that parking location is equipped with ground power.
The EXT POWER annunciator blinks whenever ground power is “available” to the aircraft, meaning that the ground power cable is connected to the aircraft; however, the aircraft is not electrically receiving ground power until the EXT POWER switch is placed in the ON position.
The external power voltmeter will show a voltage anytime ground power is available to the aircraft so that the voltage can be confirmed to be within an acceptable range before electrically connecting the ground power to the aircraft’s buses, and sensitive electronics.
