2013年9月14日，某航飞机在机库执行4C检工作。地面指挥人员通过耳机联络维修人员将水上迫降电门松出。在操作过程中，维修人员未意识到两按钮名称相似，未执行交叉检查，误将水上迫降电门右上方的前货舱灭火瓶释放按钮压下，造成前货舱灭火瓶释放。此项属于下列中的哪一项

4.Schematic diagrams shall be used when necessary to indicate”flow”and to illustrate the operation of air control,electrical,fluid-power,fuel and turbo systems in as straightforward a manner as possible.

3. If there is no hydralulic power to extend the nose goar, the weight of the gear and the airstream pushes the nose gear into the extended position.

2 .The seation containing”Emergency Procedures”shallhave aredplasticized tab divider.

1.动力装置仪表标记的说明应紧跟着动力装置限制的说明。