The average U.S. coal plant is offline 12.5 percent of the year for scheduled and unscheduledmaintenance.
美国的煤电厂平均一年有12.5%的时间用来做定期或不定期的维护。
2
Improper rework practices can result in unscheduledmaintenance or surface damage that causes crack initiation.
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。
3
If unscheduledmaintenance is required, how long will it take to find a replacement aircraft and will that aircraft be of the same type and quality as my original aircraft?