The cover title and applicable airplane designation shall be prominently displayed on the cover or spine of the Handbook. Other information may be displayed on the cover.
答案解析
解析：
在飞机手册的封面上，应该明显显示手册的标题和适用的飞机名称，可以显示在封面页上或手册的脊梁上。同时，其他信息也可以显示在封面上。
举个例子，就好像一本书的封面一样，通常会显示书名和作者，这样读者一眼就能看到这本书的主题和内容。同样，飞机手册的封面也需要清晰地显示手册的标题和适用的飞机名称，以便使用者能够快速找到需要的信息。其他信息的显示也可以帮助使用者更好地了解手册的内容和用途。
相关知识点：
手册封面或书脊要显关键信息
相关题目
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If the scratch does not go through the protective layer, the unit is serviceable.
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