Is "Lights Out" FAA Reg?

Date:         16 Sep 97 02:35:23 
From:         Dave Benjamin <dbenj@slip.net>
Organization: Slip.Net (http://www.slip.net)
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Airlines dim cabin lights for take-off and landing as regularly as they
make safety announcements and checks before take-off and landing.  They
dim the lights in daytime as well as night, so the dimming doesn't seem
to be related to passenger siteseeing considerations.

>From observation, it would appear that the FAA (or A/C manufactures)
require dimming of cabin lights for take-off and landing.  Is cabin
light dimming a requirement?  And if it is, why?