波音707原型机上发展起来的波音KC-135空中加油机有些已经飞行50多年了。
Engineers reckon they could still be in the air when they are 80.
工程师们测算80机龄时它们仍然能飞上蓝天。
One thing that does ground old aircraft is the impending failure of their aluminium structurefrom metal fatigue.
让老旧飞机搁浅的一件事就是飞机铝构造因为金属疲劳产生的故障隐患。
This begins in parts that are subjected to repeated strains, such as where the wings join thefuselage.
这种故障始于承受反复拉紧的部位,象机翼与机身的连接处。
Constant flexing of the structure concentrates stress, which leads to microscopic cracks.
这些构造部位的频繁伸缩使应力集中,导致微裂纹的产生。
These cracks become more numerous and eventually large enough for the structure to fail.
这些微裂纹越来越多,最后多到足以使这些部位的构造断裂。
Aircraft engineers know a lot about how these cracks progress and keep an eye on them inroutine overhauls.
飞机工程师们对这些裂纹如何发展以及在例行检修中如何注意这些裂纹所知甚详。
Nevertheless, they can be difficult and costly to find.
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