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喷气式飞机在60年代进入各航空公司的机队后,世界航空事业有了很大的发展,却也给人类生活的上空带来了更大的噪音。70年代,国际民航组织规定了飞机噪音标准。1980年欧共体通过一项决议:达不到噪音控制的飞机不得在欧洲降落。非洲各航空公司与欧洲国家有着紧密联系,而且它们拥有的喷气式飞机往往达不到噪音控制规定,因此它们目前陷入严重困境。国际民航组织把现在服役的飞机分成为三类,非洲国家大多使用第一类飞机,即没有适航证书或者只有1969年以前适航证书的波音707、727、737、DC-8、DC-9、VC-10、
After the jets entered the fleet of airlines in the 1960s, great progress has been made in the field of aviation in the world, but it has also brought greater noise to the human lives. In the 1970s, ICAO provided aircraft noise standards. In 1980 the EC passed a resolution: No noise-controlled aircraft can not land in Europe. African airlines are in close contact with European countries and their jets often fail to meet noise control requirements and as a result they are currently in serious trouble. ICAO divides the aircraft currently in service into three categories, most of which use the first type of aircraft, namely Boeing 707, 727, 737, DC-8, DC-9 without a certificate of airworthiness or with a certificate of airworthiness until 1969 , VC-10,