翻修不当可能会造成非计划性维修和表面损伤从而造成裂纹。
Improper rework practices can result in unscheduled maintenance or surface damage that causes crack initiation.
很多系统发生故障是由于相对便宜的部件损坏，而它导致的非计划停机而发生的维修费用要比这个部件本身的成本高得多。
Many system field failures occur because relativelyinexpensive parts wear out, causing unscheduled shutdowns with costs that arefar greater than the cost of the part.
发电容量的退出是为了计划维修或计划停电，或者偶然由于非计划或强迫停运。
Generating capacity is taken out of service for scheduled maintenance or planned outage and is occasionally lost on an unplanned or forced outage.
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