Hey guys.... just wondering..
I was on a night flight not too long ago, and I got a cockpit visit after the flight (an A320) and the flightdeck was cold, dark, and all shut down by the time that I got up there, and I was wondering, with all of the systems off, like the battery, APU etc. for the night, what powers the cabin lights, lavs, etc. after all of that is off? Is it the ground power? Also, when the last pax. leaves and the crew is putting the aircraft to bed, what is the process that they go thru to get all of these things turned off?