點解飛机在晚上升降時要較暗d燈同開窗廉?

因為如果當發生任何意外事故, 要令眼睛適應較暗的環境, 盡快適應而投入機外面的暗環境!

That is because in case of any accident (such as escape from the plane), when you move out from the plane into a dark environment, your eyes will not "adapt" quick enough if the plane was fully light-up / bright before you escape, therefore, to keep the plane in a darker environment is a good way to prepare for any emergency!

2009-05-01 15:23:13 補充：
所以如果當發生任何意外之前, 如果機內環境是明亮的, 那麼我們的眼睛就不能立即適應過來, 而需要較長時間看見眼前較暗的機外環境, 那是對我們不利的! 所以晚上升降時要較暗d燈同開窗廉!!

2009-05-01 15:24:36 補充：
希望幫到你!! ^_^

it aims to let yr eyes to accomodate the dark environment...

開窗廉: if accident happens, the windows are the only way to see outside in order to check where are we now... so, the window blind must open up////

Both are the saftey concern and it is very important..