300、Before you do this procedure, engage the ramp service door safety connector pin. 在执行此步骤之前，请连接斜坡服务门安全连接器插销。

Insert the pin of the apron service door security connector, then you can perform this procedure.

The ramp service door safety pin should be engaged until you start this procedure.

Firstly you should perform this procedure then you can engage the ramp service door safety connectorpin.

正确答案：A

1189、Install the larger bolts.

1188、Set the STANDBYI POWER switch on the P5 panel to the OFF position.

1187、Each page must bear the date of the original issue until revised and, when revised, that of the latest revision

1186、When you use an approved word, make sure that you only use it as that part of speech.

1185、One characteristic of the component is preventing its axis of rotation tilting as the earth rotates.

1184、Advisory circular is information provided by FAA that is not mandatory

1183、Tighten the coaxial connectors (hand tight plus 1/4 turn).

1182、压缩机需要配备压力调节器、空气软管和适当的过滤系统,以确保将清洁、干燥、无油的空气输送至喷嘴。

1181、Make sure that the indicator light comes on when the blades unfold.

1180、断开所有测试不需要的系统。