如果不拆下部件进行大修，必须去除所有可见的腐蚀，并按设计要求或更高的要求恢复涂层。
When the component is removed for overhaul, all evidence of corrosion must be removed and finishes restored to design requirements or better.
大修过程中，许多起落架部件的镀镍层和镀铬层完全被剥离。
During overhaul, many landing gear components are completely stripped to replace nickel and chrome plating.
因此，在大修和部件维护时，检查表面损伤状况很有必要。
Therefore, surface damage detection is important during overhaul and on components in service.
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