Airworthiness Directive is procedure that must be used when performing maintenance on an aircraft.

A. Be patient while the door is opening.

B. Be aware of the door when it is opening.

C. Be careful while the door is opening.

A. Turn the drain valve counterclockwise to cause the fluid to stop flowing before the valve is pushed.

B. When you turn the drain valve counterclockwise, no fluid will flow until you push the valve in.

C. Make sure there is no fluid flowing after the valve is pushed, then turn the drain valve clockwise.

A. Make sure that there is airflow in the pipe to hinder .

B. Make sure that there is something in the pipe to block the airflow.

C. Make sure that there is nothing in the pipe to hinder airflow.

A. Each of the two life vests located at L2 entry door flight crew station is damaged.

B. Each of the two life vests located at L2 entry door flight crew station is out of time limit.

C. Each of the two life vests located at L2 entry door flight crew station is out of service.

A. Spoilers are used to increase the drag of the aircraft in flight, or to interrupt lift during landing and during rejected take-off.

B. Spoilers are used to enhance aircraft resistance in flight or to disrupt boost during landing and when take-off is canceled.

C. Spoilers are used to increase the aircraft drag in flight, or destroy the lift during landing and in case of aborted take-off.

A. 确保发动机排气区周围有安全围挡。

B. 确保发动机进气区前面有安全界线。

C. 确保工程排气区前面有安全阻碍。

A. At the manufacturer＇s option, static pressure systems description and discussion may be combined with Paragraph 7.49, Pitot Pressure Systems.

B. The manufacturer could combine the description and discussion of the dynamic pressure systems in Paragraph 7.49, Pitot Pressure Systems.

C. The manufacturer decides to insert static pressure systems description and discussion into Paragraph 7.49, Pitot Pressure Systems.

A. 本程序中要求不止一个人。

B. 对于本程序来说，更多的人员要求是必要的。

C. 执行本程序需要超过一个人。

A. Collect all maintenance records for the part PNxxxx.

B. Compile all maintenance logs for the component PNxxxx.

C. Collect all flight logs for the component PNxxxx.

A. The coating thickness must be more than 0.05mm and less than 0.06mm.

B. The thickness of the second coating layer must be 0.05mm and 0.06mm.

C. The thickness of primer layer must be between 0.05 mm and 0.06 mm.