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Aircraft Rapid Decompression Problems Without question, the rapid decompression of the Qantas Boeing 747 that landed in Mani

admin2013-05-04  25
问题                 Aircraft Rapid Decompression Problems
    Without question, the rapid decompression of the Qantas Boeing 747 that landed in Manila on July 25 was bizarre. Fortunately, large gashes do not often appear in passenger jets. When they do, they tend to happen where there is structural strain (like at door hatches), not in the forward cargo compartment, as in this case with Qantas. The cause of the accident remains a mystery, and the U. S. is sending a team from the National Transportation Safety Board to assist in the investigation in the Philippines.
    But rapid decompressions, in general, are not unheard of—and, as the passengers from the Qantas plane now know, not necessarily as apocalyptic as they seem at the time.
    What happens when your plane suddenly depressurizes? Any dramatic loss of pressure caused by the sudden surge of outside air into the cabin—feels like you are going up a skyscraper in an elevator powered by a rocket. Your ears pop, and the pain can be intense. You may experience some temporary hearing problems, but nothing too serious in most cases.
    At the same time, the plane will likely drop in altitude quite dramatically. But this sensation is actually good news, says Todd Curtis, an engineer and former airline safety analyst at Boeing. It usually means that the pilots are trying to get the plane low enough so that the outside air is breathable for humans. Says Curtis, "It may seem like the aircraft is going through a radical maneuver, and it is radical compared to normal flying, but this is standard protocol."
    Meanwhile, the oxygen masks will probably drop from the ceiling. This, too, may look exceedingly ominous. But you won’t die if you don’t get a mask on, provided you were already generally healthy. "Passing out is about the worst thing that would happen," Curtis says. There are only about 10 to 15 minutes of oxygen on those masks anyway, and they are provided just to help keep you comfortable until the plane reaches a lower altitude, where you can breathe easily and without assistance. The most important thing is that the pilots get their masks on first-and they have been trained to do this much faster than you will get yours on. It is best to put your mask on before helping anyone else, since you only have a matter of seconds before you may lose consciousness.
    As if there weren’t enough going on, it is also quite common to see what looks like smoke in the air. But this is actually fog or mist that comes from the sudden change in pressure.
    The flight can continue on in this surreal fashion for a while and passengers will usually remain relatively calm, as evidenced by video taken inside the Qantas flight. Decompression may be scary, but it is survivable.
When the plane suddenly depressurizes,______.
选项 A、passengers should go into the elevator powered by a rocket
B、passengers may have serious hearing problems
C、pilots should try to fly low enough for breathable air
D、pilots should help passengers put their masks on
答案C
解析 推理判断题。文章第三段中提到当飞机快速减压时，给人的感觉像是身处摩天大楼内由火箭提供动力的电梯，而不是说乘客应该撤往电梯，可排除[A]；第三段中还提到可能会遇到暂时的听力问题，不过一般不会太过严重，排除[B]；第四段第三句说到飞行员会低飞以获得可供呼吸的空气，[C]正确。[D]在文中也并未提及。
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