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the breaker is held closed by the permanent magnet. Application of 28 volt dc to trip,
reverses the polarity of the coil and the contactor opens assisted by the spring. The
coil deenergizes through the auxiliary contact.
[6] The 115 volt ac, 400Hz, 3-phase power from an external source (ground power
unit) can also be supplied to the airplane for systems use .The external ac power
system consists of an external power receptacle, bus protection panel, two external
power contactors, relays, switches and indicating lights. The ac external power
receptacle is located on the right side of the airplane, forward of the nose wheel
well .The bus protection panel (BPP) is used for control and protection of the
airplane circuits connected to external power. The two external power contactors
connect 115 volt ac, 400 Hertz, 3-phase power to the distribution system from
external power source.
[7] The 115 volt ac system is supplied by two engine driven generators, APU driven
generator or external power. The power is connected to the generator main busses
by engine generator breakers, APU breakers and external power contactors .Power
is also supplied to two transfer busses through transfer relays. External power can
be supplied to the external ac bus and the ground service bus (the bus is used for
servicing of the airplane ).The ground service bus can also be supplied from
generator bus NO.1.
[8] The 28 volt ac system is obtained through transformers from main, transfer ,and
ground service busses. The 28 volt dc power is supplied from the battery and
transformer rectifiers to the battery bus and two dc busses. The power is connected
to the busses by relays .The battery charger is supplied with power from the 115
volt ac system. The electronic system power is supplied from the 115 volt ac and 28
volt dc system .The standby ac and dc busses are powered normally from the
generated ac and dc power. Alternately, the battery supplies power to the standby
system. The standby power components are located in the electronics compartment,
P6 panel and P5 panel .The purpose of the standby power distribution is to
provided 115 volt ac and 28 volt dc power to essential system during absence of
normal supply.
EXERCISE
A. Find out the explanations of the following words in your “English-Chinese
technical dictionary”
1. signal [ P1-136 ]
2. bus protection panel [ P1-24 ]
3. latch [ P1-90 ]
4. de-energize [ P1-40 ]
5. relay [ P1-124 ]
6. transfer [ P1-159 ]
B. Translate the following sentences into Chinese
1. 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.
2. The neutral current transformer sense the total current flowing through the APU
generator at the neutral terminal.
3. The 115 volt ac, 400Hz, 3-phase power from an external source can also be
supplied to the airplane for systems use, the ac external power receptacle is
located on the right side of the airplane, forward of the nose wheel well.
4. The 28 volt ac system is obtained through transformers from main, transfer and
ground service busses. The 28 volt dc power is supplied from the battery and
transformer rectifiers to the battery bus and 2 dc busses.
5. The standby ac and dc busses are powered normally from the generated ac and
dc power. Alternately, the battery supplies power to the standby system.
LESSON 20
NAVIGATION
VOCABULARY
1. navigation [ nævigein ] n. 導航
2. compute [ kmpju:t ] v. ;n 計算
3. movement [mu:vmnt ] n. 運動;移動
4. include [ inklu:d ] v. 包含;包括
5. subsystem [sbsistm ] n. 子系統(tǒng);分系統(tǒng)
6. ADF = Automatic Direction Finder 自動定向儀
7. relative bearing ['reltiv]['bri] 相對方位(角)
8. VOR = Very high frequency omnirange 甚高頻全向信標
9. ILS = Instrument Landing System 儀表著陸系統(tǒng)
10. magnetic bearing 磁方位(角)
11. deviation [ di:viein ] n. 偏離;偏差
12. course [ k :s ] n. 航線
13. turn [ t:n ] v. 轉動;擰
14. optimum [ ptimm ] a. ; n. 最佳的;最適宜的
15. DME = Distance Measuring Equipment 測距儀
16. slant range [ sla:nt ] [ reind ] 斜距
17. ATC = Air traffic Control 空中交通管制
18. identification [ aidentifikein ] n. 識別;標志
19. altitude [æltitju:d ] n. 高度
20. ADS = Air Data System 大氣數據系統(tǒng)
21. pitot pressure [pitou ] 全壓;皮托管壓力
22. static pressure [stætik ] 靜壓
23. various [vris ] a. 不同的;各種各樣的
　
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