Switching 'on' emergency lights
ChristiaanJ,
I, too, am an engineer. One company I worked for checked the lights daily, in- and out- side on the overnight check. They were also demonstrated every flight as part of the safety briefing. One day one of our electricians told me it took up to six hours for the battery packs to recharge after operating the lights, maybe they are quicker nowadays. I am referring to B737-300 series.