于是他们就换了一个飞机维修计划（maintenance planning）问题，我思考后又对他们说，这个项目没有涉及民航的主营业务，只是一个辅助功能，价值有限，希望再换一个。
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实际上航天飞机发射成功的次数要比宣传中的少。 操纵维修保养复杂，也不像计划中的那么廉价，经常导致无法正常工作，使得在太空中做一些性价比更高的事情的希望消失了。
And there was, in fact, less success than advertised.They were too cantankerous to fly as often or as inexpensively as planned, so the hope of doing things more cheaply in space evaporated.
飞机维修作为严谨、复杂、计划性的行业，引入工时管理是必然的。
Aircraft maintenance, as the serious, complex, planned industry, the introduction of work hours management is inevitable.
按照年度计划、航班计划、维护方案、飞机状况，制定月维修计划，并预测每月定检、完成非例行工作所需的落地时间和停场时间；
Make monthly maintenance plan according to annual plan, flight plan, Maintenance Program and aircraft status, forecast the landing time and down time for monthly scheduled check and non-routine task;
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