操作测试：这个过程仅需要确定系统或单元是可工作的。这些测试不应需要除已安装在飞机上外的任何特殊设备或设施，应该与机组人员执行的测试相当。操作测试不要求满足针对翻修或重大修理制定的规范和容错要求。

The airplanes were delivered with recommended inspection programs to keep them airworthy.

The topic sentence is the first and most important sentence in a paragraph.

You must use ear protection when you are near an engine that is in operation.

Make sure that the bogie rollers are aligned with the notches in the track.

To prevent damage to the engine, immediately install protective covers on all openings.

A mixture of water and methanol increases the power of the engine.

Make sure that the label fully attaches to the surface and that there are no bubbles.

Apply two layers of protective compound to prevent hydraulic fluid damage to the sealant.

It is the responsibility of the airplane owner and the pilot to insure that the airplane is loaded properly.

Overhaul of any or all components in this chapter must be accomplished with data supplied by the component manufacturer.