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Vortex generator
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==Aircraft noise reduction== Vortex generators have been used on the wing underside of [[Airbus A320 family]] aircraft to reduce noise generated by airflow over circular pressure equalisation vents for the fuel tanks. Lufthansa claims a noise reduction of up to 2 dB can thus be achieved.<ref>[http://www.lufthansagroup.com/en/press/news-releases/singleview/archive/2014/february/12/article/2797.html More than 200 Lufthansa A320 aircraft to become quieter.] {{Webarchive|url=https://web.archive.org/web/20140504034353/http://www.lufthansagroup.com/en/press/news-releases/singleview/archive/2014/february/12/article/2797.html |date=2014-05-04 }} Retrieved 2014-05-04</ref>
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