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heat shield and a muffler. The muffler is inside the heat shield. A felt metal
liner is installed on the inside surface of the muffler for noise reduction. At
the forward end ,the heat shield has a drip pan and is supported by the
engine shroud. There si a gap between the muffler and the APU engine
exhaust. At the aft end ,the exhaust duct is supported by the aft fairing .
APU 排放口引導發動機排出氣體到外面并降低高速氣流的噪音。排放
管道包括一個加熱保護罩和一個消音器。消音器安裝于加熱保護罩內
部。一個絕緣金屬墊片消音器內表面上，用來降低噪音。在加熱器前
端有一個集油盤并被發動機保護罩支持。在消音器與APU 發動機排
氣口之間有一個間隙。排氣管道后端由后整流罩支撐。
LESSON 19 AUXILIARY POWER UNIT （2）
一、單詞
首先Primarily 供給Furnish 接線端teminal
中線Neutral 導線Lead 在…外面Outside
放電器Discharger 開縫的slotted 頻率Frequency
得到Achieve 跳開關Breaker 閉合Closing
松開Tripping 永久磁鐵Permanent
magnet
幫助Assist
鎖定Latch 彈簧Spring 保持hold
觸點Contact 接觸器Contactor 信號Signal
獲得Gain 應用Application 允許Allow
短暫的Momentary 通電Energize 線圈Coil
極性polarity 插座Receptacle 匯流條防護Bus protection
panel
充電器Charger 主要的Essential 缺席Absence
柱螺栓stud
二、TEXT
(1) the APU driven generator is mounted on the foreard face of the APU
accessory drive gearbox. The APU generator produces the AC power
required by the airplane systems primarily for ground operation, the
generator can also be used as a backup generator in flight. APU is used to
furnish 60 KVA of electrical power on the ground and used as AC power
source of 50 KVA in flight.
APU 驅動的發電機安裝在APU 附件齒輪箱前表面上。APU 發電機可
產生飛機在地面操作時系統所需基本交流電，此發電機同時也可做為
飛行中的備用電源。APU 被用來在地面提供60 千伏安的電源及飛行
中提供50 千伏安的交流電源。
(2) The APU ac generator has 6 ac terminals:
T1,T2,and T3 are the power terminals, T4,T5 and T6 are the neutral or
ground terminals.
T1 and T4 are for phase A, the leads are color-coded red.
T2 and T5 are for phase C, the leads are color-coded blue.
T3 and T6 are for phase B, the leads are color-coded yellow.
These terminal numbering and color-coding is the same as for the engine
–driven generators. Cooling air enters through a duct from outside the
APU compartment, passes through the generator and discharges into the
APU. The generator is attached to the APU accessory drive gearbox with
12 slotted holes over mounting studs. The neutral current transformer
sense the total current flowing through the APU generator at the neutral
terminal.
APU 發電機有六個交流接線端：
T1，T2 和T3 是電源接線端，T4，T5 和T6 是中線或地面接線端。
T1 和T4 為A 相，導線顏色為紅色。
T2 和T5 為C 相，導線顏色為藍色。
T3 和T6 為B 相，導線顏色為黃色。
這些接線端號碼及顏色代碼與發動機驅動的發電機是相同的。冷卻空
氣通過一個APU 外面的管道進來，通過發電機和排氣裝置進入APU。
發電機被放在APU 附件驅動齒輪箱上，用12 個雙頭螺栓固定。中線
電流轉換感受流過APU 發電機中線接線端的總的電流。
(3) The ac power produced by APU generator is of constant frequency. To
achieve this, the APU generator drive( including a gearbox) can be used
for reducing the high speed of the APU engine to a lower speed. The APU
engine drive the generator in lower speed to produce ac power at constant
frequency.
APU 發電機產生的交流電源是恒頻的。為得到恒頻電源，APU 驅動
發電機可將APU 發動機高速度降成低速使用。APU 發動機以低速驅
動發電機，從而產生恒頻的交流電。
(4) The two APU generator breakers( see figure 19-2) connect 115 volt ac,
400 hertz, 3-phase power to the distribution system from the APU
generator. The APU generator breakers are located in the bottom of the P6
panel in the flight compartment. The breaker has a dc coil for closing and
tripping. A permanent magnet assists closing and latches the breaker in the
closed position. An internal spring assists opening and holds it in the open
position. The breaker has 6 main 115 volt ac contacts and 20 auxiliary
contacts. The auxiliary contacts are used to control the positions of APU
generator breakers and external power contactors, and for indicating lights
in the flights in the flight compartment. The closing and tripping signals
for the breakers are from the P5-4 panel. The breaker conacts position is
indicated by the blue APU GEN OFF BUS light on the P5-4 panel. Access
to the breaker is gained by opening circuit breaker panerls p6-11 and
P6-12 at the bottom of P6 panel.
兩中APU 發電機跳開關將115 伏，400HZ 的三相交流電連接到APU
發電機的分配系統。APU 發電機跳開關安裝在駕駛艙P6 面板的低部。
跳開關有一個打開/閉合用的直流線圈。一個永久磁鐵幫助跳開關閉合
　
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