927、The engine bleed air system leak check using the APU describes how to use the APU to pressurize the system to check thesense lines and these system components for leaks.
答案解析
解析：
相关知识点：
用APU查发动机引气系统漏
相关题目
561.Check all parts for obvious defects in accordance with standard industry practices." 根据标准行业惯例检查所有部件是否有明显缺陷
560、Only approved persons are permitted to stay in this area.
559、Turbine engine tachometers usually measure speed as a percentage of the nominal maximum speed ofthe turbines.
558、All persons in this area must use a respirator.
557 、 The ozone converter prevents damage to the air separation module from oxidation of the membranematerial by ozone.
556、将溢流阀门拔动开关保持在打开位置，直到流出阀位置指示器显示完全打开。
555、Loosen the screws that attach the clamp to the support.
554、The diagram shall be arranged so that the flow of the system dan be traced with a minimum of effort. 图表的安排应使系统的流程能够以最小的努力进行跟踪。
553、The precision of the gauges must agree with the applicable quality standard.
552、通气油箱排放单向活门是在 1 号和 2 号主油箱外侧油箱端部肋上。
