Sunday, April 23, 2017

Why they dim the lights on planes during landing

On the bright side, the lights are dim.
I always thought it was to conserve power, and it does, but there's another reason.
“You want your eyes acclimated,” says Jon Lewis, a senior pilot with a major U.S. airline. “During nighttime takeoffs and landings, you dim the lights so that you have some night vision going on.” 
Dimming cabin lights during the day, then, is less necessary, but does conserve some engine power as the plane hurtles toward flight. (Less taxation on the engine means an aircraft can shorten its takeoff roll, or when a plane is aligned with a runway centerline and will soon become airborne.)
It can take our eyes between ten and 30 minutes to fully adjust to a dark setting, reports The Telegraph, which means that dimming the lights can help eyes pre-adjust to lower light. And if it’s night when everyone must suddenly evacuate, those several seconds it takes for your eyes to calibrate to low-light conditions are precious, and can make all the difference in safely exiting the aircraft. In dimmer light, emergency lighting and illuminated pathways will be more visible, too.
Dimming the lights also gives the crew a better chance to drag a passenger off the plane without being seen.

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