890、Transfer of hydraulic fluid between hydraulic system A and B is caused by improper operation of system controls or wornequipment.

598、Make sure that the intensity of the reticle light decreases gradually to zero. 确保十字线光的强度逐渐降低到零。

597、Make sure that the parts are loosely assembled 一定要把零件组装好

596、In this configuration, a different test procedure is mandatory.

595、This Cap has been prepared with the intent to expand present inspection requirements as a furtherassurance of the ability of the airplane to perform within the limits of the original certification.

594、Due to frequent changes in, or varying combinations of, some types of equipment such as avionicsand instrumentation, ones or more separate documents for these products may be required. 由于某些类型的设备如航空电子设备和仪器仪表的频繁变化或不同的组合，这些产品可能需要一个或多个单独的文档。

593、Two persons are necessary ‘to do this procedure.

592、正常操作时,确保释压活门关闭。释压活门打开表示燃油通气系统出现问题。

591、Technical texts often contain long groups of words that have the function of one part of speech in asentence

590、该规范给出了继电器、二极管和系统其他部件的符号。

589、外界大气温度是指自由空气的静态温度，可从飞机上的温度指示或地面气象源获得，并根据仪器误差和压缩性效应进行调整。