Which dome light can operate on battery power?

The right-hand dome light is designed to operate on battery power, making it uniquely capable in situations where electrical power from the aircraft's systems is unavailable. This feature is essential for maintaining illumination inside the cabin during events like power failures or when the aircraft is on the ground without external power.

The left-hand dome light, in contrast, might not have this same capability, which restricts its functionality to when the aircraft is receiving power from its electrical system. This distinction is important for crew awareness during flight operations, especially if there is a need for cabin lighting in emergencies or during maintenance checks without auxiliary power sources. Understanding which dome light can function independently on battery power enhances situational awareness and readiness for various operational scenarios.