Utilizing an airplane as intended by the manufacturer, combined with sound inspection and maintenance practices , forms the basis for assuring the airplane remains airworthy and safe to operate.
答案解析
解析：
举个例子来帮助理解：就好比你买了一辆汽车，如果你按照制造商的说明书正确使用，并且定期做保养和检查，那么这辆汽车就会保持良好的状态，安全可靠地运行。同样，飞机也需要按照设计目的正确使用，并且经过检查和维护，才能保证飞机的适航性和安全运行。
相关知识点：
按要求用机并维保保适航
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