Why during night flights does the crew insist that lights are dimmed and blinds on the plane windows are closed?
by 
the pirate
ANSWERS: 3
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So that those who would like to sleep can do so.
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The other thing you have to consider it outside air traffic. Aircraft usually have four or five navigational lights: a red light on the left (port) wingtip; a green light on the right (starboard) wingtip; plus either one or two strobe lights - one on the underside of the plane, and one on either the back or tip of the vertical tailfin. Like ships, these are used to locate and orient planes by other pilots within the vicinity. Having open portholes with lights shining out of them can confuse pilots, and give them a false impression of that aircraft's actual position and orientation in relation to themselves.
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The real reason of course is that in case of an accident in the dark the lights in the plane will go out leaving emergency lighting in the isles.Aviation medicine research show the a person been explosed to bright white light before decending into total darkness causes tempory night vision impairment.This will cause delay in exiting the aircraft and possible injury or death.
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