Do not stretch the seals more than necessary when you install them.

A. Stringers and the upper wing skin are called vent channels. The vent channels go through drain float valves in the center tank.

B. Stringers and the upper wing skin are compose of the vent channels. The vent channels got exhaust float valves from the center tank.

C. Stringers and the upper wing skin make the vent channels. The vent channels have drain float valves in the center tank.

A. If ordering any wire bundles from Boeing is mandatory, operators has the right to purchase the bundles from other supplier and ask them to provide the base wire bundle number (61-30396 in this case) and tail number of the airplane.

B. It is a necessity for the operators to provide the base wire bundle number (61-30396 in this case) and tail number of the airplane on which the bundle is to be installed if ordering any wire bundles from Boeing is necessary.

C. Operators should provide the number(61-30396 in this case) of the airplane where the bundles are to be installed on if ordering any wire bundles from Boeing is necessary.

A. 制造商可制定程序，供使用CAP时发现的不适航的情况（无论是否包含在CAP中）提供反馈（来自遵循CAP的运营人和维修机构）。

B. 制造商可制定程序，供运营人和维修机构反馈在使用CAP时发现的不适航情况，无论相关部件是否包含在CAP中。

C. 制造商可以建立程序，以提供（遵守CAP的运营商和维修机构）在遵守时发现的不适航情况（无论CAP是否涵盖）的反馈。

A. 如果左CMC故障，会自动转换使右CMC提供输出

B. 如果左CMC失效，会自动打开电门，由右CMC提供输出

C. 如果左CMC掉落，自动电门会使右CMC提供输出

A. In the STE example, this safety description is given as a caution, but if you know about oxygen systems, you also know that oxygen can occur explosions.

B. In the non-STE example, this safety instruction is given as a caution, but if you know about oxygen systems, you also know that oxygen can cause explosions.

C. In the non-STE example, caution is given in this safety description. But if you know about nitrogen systems, you also know that nitrogen can cause flames.

A. Utilizing an airplane as intended by the manufacturer and sound inspection and maintenance practices is basis that assures the airplane remains airworthy and safe to operate.

B. One of the basis for assuring the airplane remains airworthy and safe to operate is sound inspection and maintenance practices and forms.

C. Utilizing an airplane as intended by the manufacturer is the only basis for assuring the airplane remains airworthy and safe to operate.

A. Make sure the cabin pressure relief valve is open.

B. Make sure the cabin pressure outflow valve is open.

C. Make sure the cabin pressure bypass valve is open.

A. 电源系统讲的是发电、控制和向其他系统提供交流或直流电的组件和部件，包括发电机、继电器、变流器、电瓶等。

B. 电源系统讲的是发电、控制和向其他系统提供交流或直流电的组件和部件，包括发电机、继电器、整流器、电瓶等。

C. 电源系统讲的是发电、控制和向其他系统提供交流或直流电的组件和部件，包括发电机、继电器、静变流器、电瓶等。

A. Make sure that there is a different distance between the holes.

B. Make sure that you space the holes equally.

C. The holes should have long distances.