Nowadays there is a variety of blended approaches to heavy maintenance.

近来,飞机大修采取了一系列的混合方法.

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Labor – Labor is the dominant component of heavy maintenance cost, accounting for 70 percent.

人工成本——人工成本是机体大修中最主要的成本因素, 占总体成本的70%.

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For an independent airframe heavy maintenance facility , 50 and 70 percent of the technicians are FAA - certificated.

对于独立的机体大修企业来说, 企业中大约 50-70% 的人员拥有FAA执照.

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Helicopters are expensive and delicate machines requiring heavy maintenance, especially when flying in dusty conditions.

直升机是昂贵而易损的机器,需要精心保养, 尤其是在尘土飞扬的条件下飞行时.

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