The two most common types of engines used in helicopters are the reciprocating engine and the turbine engine.

A. 检修时更换的螺母和垫圈不要丢弃，应该进行检查。

B. 如果在检查过程中拆卸了螺母和垫圈，则应更换。不要重复使用。

C. 对拆下的螺母和垫圈要进行检查，损坏的件不可以重复使用。

A. Sudden changes in temperature can adjust the internal logic.

B. The internal logic adjusts to sudden changes in temperature.

C. The internal logic can be adjusted by sudden changes in temperature.

A. Each system is composed of basic components and all equipment, mechanic controls and system related electric and hydraulic units.

B. Basic components and all apparatus are made up of each system, including mechanical controls and electrical and hydraulic units related sytem.

C. Each system includes the basic components and all instruments, mechanical controls, electrical and hydraulic units related to the system.

A. 确保能用耳机听到飞行语音记录。

B. 确保能通过耳机与客舱进行对话。

C. 确保能在耳机里听到驾驶舱的对话。

A. A version means modifying the information in the existing manual.

B. A revise explains correcting information in an old manual.

C. A revision means a modification of information in an existing manual.

A. This compound can eliminate poisonous fumes.

B. This compound can release poisonous fumes.

C. This composite alloy can release poisonous fumes.

A. 应说明燃油的总量和可用燃油量，如果燃油可用量超过FAR 23部的限制，还应说明原因。

B. 应说明油箱容量和可用燃油量，如果不可用燃油量超过FAR 23部规章的限制，还应提供用于确定飞行中不可用燃油量的相关信息。

C. 燃油的总容量如果超出了FAR 23部的规定，还应确定飞行中不可用燃油的数量。

A. 如果发现变质或损伤，必须在特定的间距内对修理进行检查和更换。

B. 修理必须在特殊的时间内进行检查，如果发现变形或损坏，则考虑更换。

C. 必须在规定的间隔内对修理进行检验，如发现老化或损坏，则必须更换。

A. Failure of the air turbine starter can trigger the engine overheat and fire indications.

B. The air turbine starter fails to trigger the engine overheat and fire indications.

C. Failure of the air turbine starter can cause the engine overheat and fire indications.

A. 本章应提供制造商认为必要的信息，以便在飞机使用寿命期内可能需要进行的各种维修、大修或重大维修时正确校平飞机。

B. 本章提供制造商认定的必要信息用以保证飞机在全寿命期中进行各种维护，翻修或大修后正确校准飞机。

C. 本章提供制造商确定需要的信息用以保证飞机在运行期间进行各种维修，翻修或大修后适当配平飞机。