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单选题
维修单位应当按照以下方式对适航性资料建立有效的控制，保证适航性资料的有效和方便使用，其中不正确的是
A
建立一套集中保管的适航性资料主本和有效的资料管理程序，保证控制分发的资料与资料主本一致。使用计算机系统保存适航性资料的，应当建立有效的备份系统
B
适航性资料主本应当不定期获得适航性资料目录索引或者直接向适航性资料发布单位核对的方法确定其有效性。使用由送修人控制其有效性的适航性资料的，使用前应当获得送修人提供的有效性声明；
C
非现行有效的适航性资料及其他非控制性的参考资料应当与现行有效的适航性资料有明确的区分标识并避免混放；
D
确保维修人员在维修过程中能及时、方便地获得需要的适航性资料，提供必要的阅读设备。
答案解析
正确答案：B
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