To assure economic life and reliability of aircraft structure, an economic maintenance program is essentially needed.
为了确保飞机结构的经济寿命和可靠性，必须制订合理的结构经济维修方案。
One of the most important things in developing aircraft structure maintenance program is to determine the inspection intervals for structure accidental damage.
确定飞机结构偶然损伤检查间隔是制定飞机结构维修大纲的关键问题之一。
The maintenance program must be prepared to insure the security and reliability before operating for the new type aircraft.
每一种新型飞机投入使用前必须制订一份维修大纲，以保持飞机的固有安全性和可靠性。
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