3月24日,一架从厦门飞往北京的国航客机因右侧驾驶舱冒烟,发出7700紧急代码,备降合肥机场。
也许你会问,什么是7700紧急代码?这就要先从2个英语单词说起了。
Transponder:应答机。一种收到无线电问询信号后,能自动回应预设代码的机器。Transponder是transmit(发射信号)和respond(回应)的合成词。
Squawk:拟声词,鸟类的大叫声。也可以形容人大声说话。
A pilot may be requested to squawk a given code by the air traffic controller via the radio, using a phrase such as " AIR CHINA 0335, squawk 0220". The pilot then selects the 0220 code on their transponder and the track on the radar screen of the air traffic controller will become correctly associated with their identity.
航空管制员在无线电里用口令要求飞行员回应指定代码,例如“AIR CHINA 0335, squawk 0220(意思是国航0335航班,回应0220)。随后飞行员把应答机的代码设置为0220,这样飞机的身份信息就能正确显示在航空管制的雷达屏幕上。
一旦出现异常情况,飞行员就会改变应答机的代码。这样无需呼叫,航空管制就会知道飞机出现了问题。
例如,厦门飞往北京的客机出现问题后,飞行员就将应答机的代码设置为7700紧急代码。
不同国家和地区对代码的规定有所不同,国际民用航空组织(International Civil Aviation Organization)规定了3种全球通用的代码:
7500 aircraft hijacking飞机被劫持
7600 radio faliur, lost communication无线电失联
7700 emergency紧急情况
说完这么严肃的话题,还是讲个冷笑话放松一下吧。
“飞行员最讨厌的歌手是?
“五月天。(mayday--国际通用无线电求救信号,来源于法语m'aider)
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