Simone空客A380是最新型的飞机，为啥卫生间的门上还要设烟灰缸？
的有关信息介绍如下：
自己google了一下，还有不少人问这个问题。根据FAA的要求，烟灰缸是必需的。
As the CEO of Singapore Airlines told Britain's Daily Telegraph, the ashtrays are mandatory under the curious regulations of America's Federal Aviation Authority. So too the no-smoking signs, which, of course, remain permanently illuminated.
http://www.pirep.org/forum/viewtopic.php?t=7253&start=0&postdays=0&postorder=asc&highlight=&sid=f5b6c81f3e048114a9e2f2a2e738e3a4
FAA 规定：
(2) Lavatories must have "No Smoking" or "No Smoking in Lavatory" placards located conspicuously on each side of the entry door and self-contained, removable ashtrays located conspicuously on or near the entry side of each lavatory door, except that one ashtray may serve more than one lavatory door if it can be seen from the cabin side of each lavatory door served. The placards must have red letters at least inch high on a white background at least 1 inch high (a "No Smoking" symbol may be included on the placard).
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/0/9174B366615B0B6E85256687006F0C81?OpenDocument
