540.There must be a good airflow in the work area.

A. Take care to the absence of leakage during the execution of each step in the valve test.

B. Throughout the valve test,verify that there are no obvious signs of leakage at each step.

C. Make certain that no leakage is present as you proceed with each step of the valve test.

A. 该限制应在飞机处于起落架上或提升装置上时使用。

B. 如果飞机在起落架上或被顶起,请查阅此文件。

C. 该限制适用于飞机在起落架上或千斤顶上。

A. 不要加注过量燃油。

B. 不要使用未知性能的燃油。

C. 不要使用性能未知的油液。

A. 当按照指令给活门施加大于设定值的力,活门会反向操作。

B. 当在相反方向上施加压力大于设定值时,它就会工作。

C. 当施加压力操作活门时,用力超过设定值活门反向活动。

A. 拆卸前用润滑脂润滑 V 型卡箍。

B. 在安装 U 型卡箍前先做润滑。

C. 安装前用润滑脂涂抹 V 型卡箍。

A. To know what you want to say and to use the words that give the wanted meaning shall always be assured.

B. In order to express the meaning that you want,always make sure that you know what you want to say and you use the words.

C. Always make sure that you use what you want to say to express the words with the meaning that you want.

A. The drain float valves in the vent tubes and the vent channels dilute the fuel in the vent system to drain out of the tank when the fuel face is lower than the valve.

B. The drain float valves in the vent tubes and the vent channels permit fuel in the vent system to drain into the tank when the fuel level is lower than the valve.

C. The drain float valves in the vent tubes and from the vent channels allow the fuel in the vent system to drain into the tank when the fuel quantity is lower than the valve.

A. The auxiliary battery and auxiliary battery charger and the main battery connect together during non-normal conditions to help supply power.

B. In normal conditions,the auxiliary battery and auxiliary battery charger should be disconnected.

C. In non-normal conditions,the auxiliary battery and auxiliary battry charger should be disconnected.

A. 在接近跑道过程中,偏差指针在航向指示器上显示飞行员正在朝哪个方向飞行。

B. 在接近跑道过程中,飞行员必须朝着航向指示器偏航指针的方向飞行。

C. 在接近跑道过程中,航向指示器的偏差指针向飞行员显示飞机必须向哪个方向飞行。

A. 描述飞机飞行仪表系统时,应说明查看其正常工作的方式以及识别失效的方式。

B. 描述飞机飞行仪表系统时,应说明如何检查其是否正常运行以及如何识别故障。

C. 描述飞机飞行仪表系统时,应说明检查其正常运行的方式以及识别障碍的方式。