These two groups explored the existing controlled languages and researched texts in several maintenance manuals. The results confirmed that a simplified language was necessary.

A. Make sure that the pressure in the cabin is almost zero.

B. Verify that the cabin pressure is not above zero.

C. Ensure that the pressure in the cabin is completely zero.

A. Always use test element that can cause sparks.

B. Never use test equipment which can cause cracks.

C. Do not use test equipment that can cause sparks.

A. 使用特定的的滑油，添加到滑油箱。

B. 使用规定的滑油，补充滑油箱。

C. 使用预订的滑油，冲洗滑油箱。

A. 试验结果表明，需要实施故障识别程序。

B. 如果测试没有给出满意的结果，执行故障隔离程序。

C. 如果测试结果不满足，启动故障探测程序。

A. Maximum Limiting speed Unsticks is the speed restrain which will not be intentionally surpassed in typical flight operations. V is communicated in knots and M in Mach Number.

B. Maximum Restriction Speed is the fastest a plane can fly without breaking the rules in normal flight. The speed is measured in knots and Mach Number.

C. Maximum Operating Limit Speed is the speed limit that may not be deliberately exceeded in normal flight operations. V is expressed in knots and M in Mach Number.

A. Write the instructions in the mandatory mode.

B. Write the instructions in the imperative form.

C. Write the instructions in the active mode.

A. A towel is not used to dry the surface.

B. Use a towel to dry the surface.

C. The surface is dried without a towel.

A. The unit of all range distances shall be nautical mile.

B. We measure all range distances in accurate miles.

C. The range of distances shall be calculated in knots.

A. On pressurized aircraft, the cabin air is distributed with a system of air ducts leaded from the pressurization source into and throughout the cabin. Typically, air is ducted to and released from ceiling ventilation.

B. Distribution of cabin air on pressurized aircraft is managed with a system of air ducts leading from the pressurization source into and throughout the cabin. Typically, air is ducted to and released from ceiling vents.

C. On pressurized aircraft cabin air is distributed with a system of air ducts leaded from the pressurization source into and throughout the cabin. Typically, air is ducted to and released from ceiling flap.

A. The bolt will be at the 2 o’clock position when you look at the pump from the rear.

B. The rivet is installed on the 2 o＇clock position of the pump when looking from rear to front.

C. Look at the bolt installed on the pump from rear to front at the 2 o＇clock position.