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Dimming Cabin Lights  
User currently offlineExcelsior767 From , joined Dec 1969, posts, RR:
Posted (14 years 10 months 2 days 5 hours ago) and read 2014 times:

Why do they dim the lights for night takeoff and landing? I was reading another topic in which this question came up and it was suggested by some that this is a FAA regulation and other suggested that it was up to the airline. In either case, why are the lights dimmed? Thanks!

Jim in Boston

13 replies: All unread, jump to last
 
User currently offlineAnsett767 From Australia, joined May 1999, 1021 posts, RR: 2
Reply 1, posted (14 years 10 months 2 days 4 hours ago) and read 1912 times:

They are dimmed usually for one main reason:
So that the people and crew inside can see the Emergency exit lights easier (I think?> 
Also because the need more power for Landings and Take offs: Ever noticed how the music and lights are turned down right as Full thrust is made?

Some airlines even basically turn all the lights Off.... and just eave the dimme dlights by the exits on during a night take off!


User currently offlineAWA757 From United States of America, joined Jul 1999, 117 posts, RR: 0
Reply 2, posted (14 years 10 months 2 days 4 hours ago) and read 1896 times:

I think the purpose serves to make the EXIT signs more visible in the event of an emergency. Please correct me if I am wrong.

User currently offlineClipper From United States of America, joined Jun 2005, 0 posts, RR: 0
Reply 3, posted (14 years 10 months 2 days 4 hours ago) and read 1898 times:

Lights are dimmed ONLY for passenger comfort, since night is when humans generally sleep. It has nothing to do with obtaining more power (ridiculous) or emergency lighting.

User currently offlineAspen1 From United States of America, joined May 1999, 267 posts, RR: 0
Reply 4, posted (14 years 10 months 2 days 4 hours ago) and read 1892 times:

its not rediculous on everyflight i have ever flown (thats over 200) they have always turned off the lights on a day flight or night flight during take off on landing they dim them

User currently offlineAWA757 From United States of America, joined Jul 1999, 117 posts, RR: 0
Reply 5, posted (14 years 10 months 2 days 4 hours ago) and read 1891 times:

Clipper - If the lights are dimmed only for passenger comfort, why do they come back on shortly after take-off? I'd like to see the F/C stumbling around in the dark trying to pass out drinks.

User currently offlineAnsett767 From Australia, joined May 1999, 1021 posts, RR: 2
Reply 6, posted (14 years 10 months 2 days 2 hours ago) and read 1883 times:

yeh
its got bugger all to do with passenger comfort as 5 mins into the flight theyre put back on!
Even day flights theyre turned off, and bck on later:
I rekcon it has something to do with power
Any Piilots here? ?Please help us!!


User currently offlineHmmmm... From Canada, joined May 1999, 2104 posts, RR: 5
Reply 7, posted (14 years 10 months 1 day 20 hours ago) and read 1871 times:

They dim the cabin lights because safety regulations require it. In a dimmed cabin there is no glare on the inside of the cabin windows that might hinder a clear external view. In the event of a crash on landing or take-off, they want the passengers' eyes to be able to see what's going on outside. Whats worse is that, once outside, egress from a brightly-lit cabin would be hampered as the passengers' eyes would have re-adjust to the dark environment of night, effectively leaving them almost blind for a few precious seconds in which they might need to escape cleanly. Additionally, emergency exit door illumination is easier to see in a dimmed cabin should there be smoke.

The amount of power it takes to light the cabin is about one-millionth of the power the engines produce.



An optimist robs himself of the joy of being pleasantly surprised
User currently offlineChrisNH From United States of America, joined Jun 1999, 4082 posts, RR: 2
Reply 8, posted (14 years 10 months 1 day 20 hours ago) and read 1868 times:

My guess is that they want passengers' eyes accustomed to the dark in case something catastrophic happens. You all know what happens to your ability to see in the dark if lights are turned out instantly. They just want to make sure your eyesight is in 'dark' mode. Of course, they won't come right out and tell you that...but it passes my test of sensibility.

User currently offlineB777-224ER From , joined Dec 1969, posts, RR:
Reply 9, posted (14 years 10 months 1 day 15 hours ago) and read 1862 times:

Ok here goes... from a F/A :
At CO the reason we either dim or turn off the lighting for take off/landing is so the crew will be able to assess conditions outside the aircraft in a emergency. If the lights were turned up there could be glare on the windows and also eyes would not be adjusted for darkness outside. The first thing we do before a possible evacuation is assess conditions outside by looking out to see what is going on (we can see things that the pilots can not) and we look for fire, smoke or water. Also yes, by having lighting turned down the exit signs and emerg path lighting will stand out but the main reason is to assess conditions.
At CO if we go by the book on lighting it would be something like this :
1. boarding -upper lighting on and sidewalls on (dim)
2. demo -upper lighting dim or off with a video and on with manual demo. sidewalls off (they remain off for passenger comfort at this point as they bother the eyes of the person in the window seat). They crew may elect some lighting on a night flight to check the cabin after the demo (seatbelts/luggage, etc).
3. takeoff -dim or off at night and can be on during the day.
4. service -upper lighting on so we can all see what we are doing.
5. after service -dim or off on a day flight and on 'night' setting for a night flight (very dim).
6. prepare for landing -upper lighting on to check the cabin again.
7. landing -same as take off.
8. arrived at gate -upper light on and sidewalls back on the same way we boarded.
9. emergency demo (to brief pax for a emerg landing/evac) -all lights to bright... this is the only time all lights go to bright except for aircraft servicing.
This is all Continental procedures and is NOT required by the FAA. Hope this helps you all out.


User currently offlineClipper From United States of America, joined Jun 2005, 0 posts, RR: 0
Reply 10, posted (14 years 10 months 1 day 13 hours ago) and read 1849 times:

It's got nothing to do with power. My answer came from my father, who has flown for Delta for 37 years.

User currently offlineRpwgw From Australia, joined Jun 1999, 209 posts, RR: 0
Reply 11, posted (14 years 10 months 20 hours ago) and read 1828 times:

The reason is similar to why you stand in a darkened room in a nocturnal house at a zoo before going to view animals. Your pupils need to adjust to the light conditions. Think how long it takes to be able to see night animals in a nocturnal house. Going from bright light inside an aircraft to a dark night down an emergency slide ain't enough time to see where you are going and get the hell out of an emergency situation.

User currently offlineRpwgw From Australia, joined Jun 1999, 209 posts, RR: 0
Reply 12, posted (14 years 10 months 20 hours ago) and read 1826 times:

The reason is similar to why you stand in a darkened room in a nocturnal house at a zoo before going to view animals. Your pupils need to adjust to the light conditions. Think how long it takes to be able to see night animals in a nocturnal house. Going from bright light inside an aircraft to a dark night down an emergency slide ain't enough time to see where you are going and get the hell out of an emergency situation.

User currently offlineRpwgw From Australia, joined Jun 1999, 209 posts, RR: 0
Reply 13, posted (14 years 10 months 20 hours ago) and read 1825 times:

The reason is similar to why you stand in a darkened room in a nocturnal house at a zoo before going to view animals. Your pupils need to adjust to the light conditions. Think how long it takes to be able to see night animals in a nocturnal house. Going from bright light inside an aircraft to a dark night down an emergency slide ain't enough time to see where you are going and get the hell out of an emergency situation.

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