qslinger From India, joined Apr 2006, 267 posts, RR: 0 Posted (1 year 11 months 3 weeks 5 days 1 hour ago) and read 6993 times:
When 787's are parked at Everette, I notice that the windows are covered by black cover. Correct me if I am wrong, but I guess they do this to keep the sunlight out and to keep it from bleaching the seats or interior etc
My question is, what does the operator do when the 787 is parked outside for a few days in the hot sun with no external power attached. Will the window dimmer still work without power? How will they keep the sun out in those cases without having to black cover the window's all over again.
KELPkid From United States of America, joined Nov 2005, 6658 posts, RR: 3
Reply 2, posted (1 year 11 months 3 weeks 4 days 14 hours ago) and read 6642 times:
It is not unusual at all for aircraft under storage to have the windows covered. Plexiglas is quite sensitive to the sun, and prolonged exposure to the sun can lead to the the windows starting to haze and crack. I'm sure Boeing does not want to have to replace the outer pane of the cabin windows when they pull aircraft out of storage
In service, the aircraft windows are regularly cleaned and polished, which prevents the problem.
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
duncan16 From United States of America, joined Apr 2012, 20 posts, RR: 0
Reply 4, posted (1 year 11 months 3 weeks 2 days 11 hours ago) and read 5788 times:
My understanding is that the dimmable windows use a technology called electrochromatic. These dimmable windows go to a clear state when there is no power. They cannot select that the windows be darkened. So, a maximum amount of heat is transmitted inboard when parked on the ramp. This must be why the black covers are needed.
Pygmalion From United States of America, joined Jun 2006, 975 posts, RR: 37
Reply 6, posted (1 year 11 months 2 weeks 3 days 10 hours ago) and read 4578 times:
the dimmable windows arent installed until after the interior goes in. The airplanes in storage dont have interiors.. Interiors install only takes a couple weeks. The dimmable portion of the window is a separate portion from the structural pressure portion that is seen on the outside.
the exterior window panes are covered just to prevent dirt and grit from sitting on the pane and degrading the optical quality over a medium storage period. Covering has nothing to do with the CFRP or UV.
bikerthai From United States of America, joined Apr 2010, 2320 posts, RR: 4
Reply 8, posted (1 year 11 months 2 weeks 2 days 19 hours ago) and read 4401 times:
Quoting Pygmalion (Reply 6): the dimmable windows arent installed until after the interior goes in.
I thought the "dimmable" function is integrated in the window itself. The only thing that is on the sidewall are the individual switches. Even without the switch, the windows can be controlled by the attendant panel.