恒定的  Constant 速度  Speed 安全的  Safe
插头  Plug 电路  Circuit 点火激励器  Ignition exciter
密封的  hermetically 密封  Seal 金属  Metal
安装  Install 连接  interface 程序化的  Sequencing
通电  Energize 保证  Ensure 起燃  Initiate
最低  Minimum 润滑  lubricate 形成  Build up
表压  Psig 释放  De-energize 保持 …状态  Remain
引导  Conduct 噪音  Noise 消音器  Muffler
因而  Thus 园柱体  Cylindrical 绝缘纸  Felt
衬垫  Liner 集油盘  Drip pan 间隔  Gap

(1) the auxiliary power unit (APU) is used for providing: 1) compressed air for engine starting. 2) Compressed air to the air conditining system on the ground or in flight. 3) Electrical power to the airplane electrical system on the ground or in
-flight ,(we will discuss APU electrical power in the next lesson).
辅助动力装置 APU被用于提供以下：
1
)为发动机起动提供压缩空气

2
)在地面或飞行中为空调系统提供压缩空气

3
)在地面或飞行中为飞机电源系统提供电源

(2) The APU engine is located in the aft end of the fuselage, behind the pressure bulkhead and below the horizontal stabilizer. The APU engine is completely enclosed in a titanium shroud. The air inlet door is located on the right side of the aft fuselage for air entrance. The airflow is split into two paths, one for the engine and the second for the accessories cooling. The cooling air exhaust overboard through a hole in lower shroud. The exhaust ducting is cooled by four air inlets around the jet pipe. Fuel is supplied through a shrouded line from fuel tank. Bleed air from the APU is supplied to the pneumatic system through a bleed valve, the bleed air can be used to perate either of the two air —conditioning packs or for main engine starting. The APU is readily accessible for inspection,
maintenance or removal through a large door in the fuselage directly
below it . removal is accomplished by lowering the assembly with a
simple hoist and cable system.
The APU is a singe shaft gas turbine engine with a two stage centrifugal
compressor, a single combustion chamber and one radial inflow turbine.
The accessories group, driven by the gear box , is at the front of the unit.

APU发动机安装于机身尾部、压力隔板后面及水平安定面下方。 APU发动机被完全地封进一个钛防护罩中。空气进口安装于机身后部右侧。进入 APU的空气被分成两个通路，一个供给发动机，另一个供给容易接近的冷却器。冷却空气通过保护罩下方的一个孔排放出去。排气管道被四个围绕喷射管道的进口空气冷却。燃油从燃油箱通过一个带保护的管道提供。从 APU出来的引气通过一个引气阀门被提供到增压系统，引气可以被用来控制两个空调组件中的任一个，也可用于发动机起动。 APU通过它正下方机身的一个大的口盖很容易接近，并通过它进行检查、维护或拆装工作。通过组件下方用一个简单的吊架和线缆系统完成拆卸。 APU是一个单轴气动涡轮发动机，它有一个两级离心压气机，一个单燃烧室和一个径向内流式涡轮。由齿轮箱驱动的附件组位于组件前面。