Display         .
Dome Light
DIM – sets overhead dome lights to low brightness.

OFF – overhead dome lights are extinguished.

BRIGHT – sets overhead dome lights to full brightness.
Operates if the main battery and the auxiliary battery (if installed)
are the only source of electrical power.
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The flight deck  AFT DOME light contains a separate bulb that
is powered by the emergency lighting system to provide for
flight deck evacuation.