819.Once designed and approved, the establishment of thorough maintenance procedures is a must.
一旦设计和批准,建立彻底的维护程序是必须的。

456、Adjust the gyro accurately.

455、每根线由文本和数字组成的编码来识别,由 2 位字母后跟 2 位数字构成。

454、修订意味着对现有手册中的信息进行修改。

453、Handbooks shall be readily revisable. (容易修订)

452、The airplane fuel system supplies pressurized fuel from the center or main tank

451、In such a case, the Title Page and the Table of Contents pages preceding each section of the Document
must bear the actual date of issue、

450、Sterilize(消毒) the mask assembly.

449、The priority computer compares the output parameters from the unit with its own available data by
means of associated logic.

448、应提供在下列飞行阶段应对客舱或发动机冒烟和/或起火情况的程序。

447、如果一个词在一个特定的技术领域只有非常少的人理解,就会对交流造成干扰。