恒定的  Constant 速度  Speed 安全的  Safe
插頭  Plug 電路  Circuit 點火激勵器  Ignition exciter
密封的  hermetically 密封  Seal 金屬  Metal
安裝  Install 連接  interface 程序化的  Sequencing
通電  Energize 保證  Ensure 起燃  Initiate
最低  Minimum 潤滑  lubricate 形成  Build up
表壓  Psig 釋放  De-energize 保持 …狀態(tài)  Remain
引導(dǎo)  Conduct 噪音  Noise 消音器  Muffler
因而  Thus 園柱體  Cylindrical 絕緣紙  Felt
襯墊  Liner 集油盤  Drip pan 間隔  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).
輔助動力裝置 APU被用于提供以下：
1
)為發(fā)動機起動提供壓縮空氣

2
)在地面或飛行中為空調(diào)系統(tǒng)提供壓縮空氣

3
)在地面或飛行中為飛機電源系統(tǒng)提供電源

(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發(fā)動機安裝于機身尾部、壓力隔板后面及水平安定面下方。 APU發(fā)動機被完全地封進一個鈦防護罩中�？諝膺M口安裝于機身后部右側(cè)。進入 APU的空氣被分成兩個通路，一個供給發(fā)動機，另一個供給容易接近的冷卻器。冷卻空氣通過保護罩下方的一個孔排放出去。排氣管道被四個圍繞噴射管道的進口空氣冷卻。燃油從燃油箱通過一個帶保護的管道提供。從 APU出來的引氣通過一個引氣閥門被提供到增壓系統(tǒng)，引氣可以被用來控制兩個空調(diào)組件中的任一個，也可用于發(fā)動機起動。 APU通過它正下方機身的一個大的口蓋很容易接近，并通過它進行檢查、維護或拆裝工作。通過組件下方用一個簡單的吊架和線纜系統(tǒng)完成拆卸。 APU是一個單軸氣動渦輪發(fā)動機，它有一個兩級離心壓氣機，一個單燃燒室和一個徑向內(nèi)流式渦輪。由齒輪箱驅(qū)動的附件組位于組件前面。