974、确保释放放气按钮开关,ON 标志灯熄灭。

514、The circuit breakers are installed on the rear of the unit.

513、Personnel must obey（遵守） this procedure.

512、lf the drain hole is clogged（堵塞）, clean it.

511、Do the troubleshooting procedure to find the cause of the malfunction.

510、If the damage is only to the middle treads, the tire is serviceable.

509、Operation of the handle releases the gas, and the slide-raft inflates. 操作手柄释放气体，和滑梯充气。

508、Reserve shall be computed as 45 minutes at the cruise power to be used for the flight.

507、Arrows shall be used to indicate flow direction when needed to understand the schematic diagram.

506、The procedures should address how often the program will be reviewed to determine if it is current andadequate for the type of maintenance being performed at the facility. 程序应处理程序审查的频率，以确定其是否为最新的，是否适合设施进行的维护类型

505 、lf you use more complicated types of sentence structure other than the imperative form, you can causeambiguity. 如果你使用祈使句以外更复杂的句子结构，就会引起歧义。