Airbus had attributed the extrusion failures to the lack of a backup seal or the effects of aging on the seals.

空中客车已经把压挤失败归于缺乏一个候补的封条或者老化对封条的影响。

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The inner seal (58) and the opening (66) are mounted in a chamber, and the chamber is closed by a second, outer seal (60) that provides a backup in case of failure of the inner seal (58).

该内密封件(58)和该开口(66)安装在腔室内，该腔室由第二外密封件(60)封闭，所述第二外密封件在所述内密封件(58)失效的情况下提供候补。

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