If you do not install the rigging pin, the elevators will move down when there is no pressure in the system.

The Boeing 747 marked the beginning of a new era in air transport.

A. The Boeing 747 symbolizes the beginning of a new ear in air transport.

B. The Boeing 747 is the first type of airplane in air transport.

C. Modern air transport started from the Boeing 747.

Airplane Inspection Periods: This paragraph shall contain information on the airplane (and components thereof) inspection periods. It should cover FAA required inspections (such as the annual and, in some cases, the 100 hour inspections) and manufacturer recommended inspections (such as the daily, 25-hour, 50-hour, etc.).

A. 飞机监测周期：本段应包含有关飞机（及其部件）监测周期的信息。信息应涵盖FAA要求的监测（如年度监测，在某些情况下还包括100小时监测）和制造商推荐的监测（如每天、25小时、50小时等)。

B. 飞机检查周期：本段应包含有关飞机（及其部件）检查周期的信息。信息应涵盖FAA要求的检查（如年度检查，在某些情况下还包括100小时检查）和制造商推荐的检查（如每日、25小时、50小时等)。

C. 飞机检视周期：本段应包含有关飞机（及其部件）检视周期的信息。信息应涵盖FAA要求的检视（如年度检视，在某些情况下还包括100小时检视）和制造商推荐的检视（如每天、25小时、50小时等)。

If the microswitch becomes unserviceable, do the deactivation procedure of the actuator to prevent damage to the valve.

A. If the microswitch becomes unserviceable, proceed with the actuator activation procedure to damage the valve.

B. When the microswitch is functional, ensure the deactivation procedure of the actuator is performed to avoid any harm to the valve.

C. If the microswitch malfunctions, execute the actuator deactivation procedure to protect the valve from harm.

以下安全措施适用于爆炸物品。

A. The following safety precautions can be used to avoid explosion.

B. The safety measures that follow are available to inflammable items.

C. The safety precautions that follow are applicable to explosive items.

All flow control devices within the system, such as check valves, fuel pumps, accumulators, and relays should be included and indicated. Solenoid valves shall be indicated as such and shall include a notation indicating whether the valve is spring-loaded to the open or closed position. Once a symbol or device is established for a valve or control, it shall be used for this type of unit throughout the manual. The symbols used should be shown and identified in a legend block on the schematic diagram.

A. 系统内的所有流量控制装置，如止回阀、燃油泵、蓄能器和继电器都应包括在内。电磁阀应标明，并应包括一个说明，表明该阀是由弹簧加载到打开或关闭位置。一旦为阀门或控制装置确定了一个符号或装置，它应在整个手册中用于该类型的装置。所用的符号应在原理图的图例块中显示和标识。

B. 系统流程图应对该系统内的所有流量控制装置进行标识，如单向活门、燃油泵、蓄压器和继电器。电磁阀门也应标识，并以注释形式说明该阀门是否使用弹簧加载在开位或关位。一旦确定了各阀门和控制器对应的符号，则应在整个手册中保持一致。

C. 系统内的所有流量控制装置，如止回阀、燃油泵、蓄能器和继电器，都应包括在内并标明。电磁阀应按此指示，并应包括一个符号，指示阀门是弹簧加载到打开位置还是关闭位置。一旦为阀门或控制装置建立了符号或装置，则应在整个手册中将其用于此类装置。所使用的符号应在原理图上的图例块中显示和标识。

电磁阀应该包括一个标志，表明阀门是弹簧加载到开启或关闭位置。

A. Solenoid switches shall indicate whether the valve is solenoid-loaded to the open or closed positon.

B. Electromagnetic valves shall include a marking indicating whether the valve is coil-loaded to the open or closed positon.

C. Solenoid valves shall include a notation indicating whether the valve is spring-loaded to the open or closed positon.

时钟通过CLOCK跳开关从28伏直流热电瓶汇流条中获取电源。

A. The clocks get power from the 28v AC hot battery bus and via the CLOCK circuit breaker.

B. The clocks get power from the 28v dc hot battery bus through the CLOCK circuit breaker.

C. The clocks is through the CLOCK circuit breaker powered from the 28v dc hot battery bus.

The primary document containing the procedures for the continuing airworthiness of an airplane is the airplane’s maintenance manual (Instructions for Continuing Airworthiness). A document prepared in accord with this Specification supplements, and is designed for use with, that maintenance manual.

A. 包含飞机持续适航维修程序的主要文件是《飞机维护手册》（《持续适航文件（ICA）》）。根据本规范编制的文件是补充性要求，应与飞机维护手册一并使用。

B. 包含飞机持续适航维修程序的主要文件是《飞机的维护手册》（《持续适航文件（ICA）》)。按照本规范编写的文件是对该维修手册的补充，也是为了与该维修手册一起使用。

C. 包含飞机持续适航维修程序的主要文件是《飞机的维护手册》（《持续适航文件（ICA）》)。根据本规范编制的文件补充了该维护手册，并设计用于该维护手册。

The first step should always be Job Set-up and last should be Close-Up or Clear -Up.

A. 工作准备总是第一个步骤，收尾或收工是最后一个步骤是

B. 工作准备总是第一个步骤，收尾或收工是接下来的步骤

C. 第一个步骤有时是工作准备，收尾或收工是接下来的步骤

利用简化的原理图和图纸来解释系统的操作方法，包括使用过程中的警告装置和控制特点。

A. Use schematics and drawings to briefly explain the operation of the system, including warning devices and control features during use.

B. Making use of simplified schematics and drawings explain how this system operates, including warning devices and control features in use.

C. The simplified diagrams and drawings are the indication of the system operation, including warning devices and control features in use.