Only when both manufacturer and operator do their job can remain an entire fleet of airplanes continuously airworthy.

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. There are only four kinds of fasteners.

B. Fasteners is generally divided into four types.

C. We classify the fasteners through four dimensions in general.

A. 确保蒙皮未受损伤。

B. 确保皮肤未被侵蚀。

C. 确保蒙皮未划伤。

A. 飞机的总体布局应该用一幅比例尺线图来表示，该图由平面、侧面和正面视图组成，在单页上按垂直顺序显示。

B. 飞机的总体布局应包括平面、侧面和正面视图，在单页上按平行顺序显示。

C. 飞机的总体布局应用图片来表示，包括平面、侧面和正面视图，在双页上按垂直顺序显示。

A. 该数字表明了系统的规模。

B. 该图片显示了系统的结构。

C. 该形状说明了系统的形式。

A. A small child should sit in an unlimited seat.

B. A small child needs to sit in a seat with safety device.

C. A small child could sit in an adult seat.

A. Make sure that the flaps and the slats are retracted.

B. Make sure that the slats and the ailerons are retracted.

C. Make sure that the flaps and the elevators are extented.

A. 调整倾斜仪，直到气泡在中心。

B. 校准倾斜仪，直到旋钮在中心。

C. 调整倾斜仪，确认气泡在中心。

A. Adjust the lever intentionally and reset the system to the neutral position.

B. Move the lever before setting the system to the neutral position again.

C. In case of an inadvertent lever movement, return the system to the neutral position again.

A. The paper must include a three-looking picture of the unit.

B. The report must inclue a three- view drawing of the unit.

C. The diagram must include a three-side drawing of the unit.