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tanks can be filled to any desired quantity, the float switches sense full tank
condition and automatically stop the fueling. Power requirements are supplied by
ground power, APU or the battery. Pressure fueling can also be done manually.
Maximum fuel pressure is 55 psi.
Fig. 12-2 Fueling system components
[5] The distribution system allows fuel to be supplied to the engines and APU. In
addition, the system can be used for defueling the tanks and for fuel transfer
between the tanks. The distribution system utilizes pumps, valves and tubing for
engine and APU feed. The fueling station is used for defueling and transfer
operations which are only possible on the ground.
[6] Fuel is first supplied to both engines from the center tank and then from the
respective tanks to engines. The crossfeed valve allows fuel from one tank to be
supplied to both engine. Fuel to the APU is primarily supplied from tank No.1, but
it can be supplied from any tank .
Fig 12-3 fuel distribution
[7] The fuel quantity indicating units measure the weight of usable fuel in the tanks.
Two types of quantity indicators are used, one is capacitance indication, another one
is a manual measuring stick .
[8] Digital fuel quantity indicators show the weight of fuel in each tank. Each
indicator consists of a single chip microcomputer system and a digital liquid crystal
display(LCD). The microcomputer measures the capacitance and resistive current in
the tank units. It monitors the leakage current and when it reaches an unacceptable
level, an error code o through 10 illuminates to assist in troubleshooting the system .
[9] The measuring sticks are graduated tapes which can be pulled down for reading
of fuel height.
EXERCISE
A. Find out the explanations of the following words in your “English-Chinese
technical dictionary”
1. seal [P1-131]
2. rib [P1-126]
3. baffle [P1-16]
4. check valve [P1-29]
5. non-return valve [P1-105]
6. boost pump [P1-22]
7. defueling valve [P1-41]
8. crossfeed [P1-38]
9. fastener [ P1-57 ]
10. float switch [ P1-64 ]
11. float valve [ P1-64 ]
12. crossfeed valve [ P1-38 ]
13. illuminate [ P1-79 ]
B. Translate the following sentences into Chinese
1. There are 3 tanks for fuel storage and 2 vent surge tanks for temporary fuel
storage. The center tank is located in the fuselage under the passenger cabin.
2. Fueling can be accomplished by the use of a single pressure fueling station
through which all tanks can be filled partially or completely.
3. The distribution system allows fuel to be supplied to the engines and APU. In
addition, the system can be used for defueling the tanks and for fuel transfer
between the tanks.
4. The capacitance indicator is one of the fuel quantity indicating units which is
used for measuring the weight of usable fuel in the tanks.
5. The measuring stick are graduated tape which can be pulled down for reading of
fuel height.
LESSON 13
HYDRAULIC POWER
VOCABULARY
1. hydraulic [haidr :lik ] a. 液压的n. 液压传动装置
2. power [pau ] n. 动力; 电源; v. 驱(拖)动
3. reverser [ riv:s ] n. 反向机构； 反推装置
4. share [ ] n. v. 共享;分担;分摊
5. responsibility [ risp nsibiliti ] n. 责任;负责
6. hydraulically powered 液压传动的
7. on demand [di ma:nd ] 有要求时
8. landing gear [gi ] 起落架
9. nose wheel steering [ stiri ] 前轮转向
10. aileron [eilr n ] n. 副翼
11. power control unit (PCU) 动力控制组件
12. elevator [ eliveit ] n. 升降舵
13. rudder [ rd ] n. 方向舵
14. flight spoiler [sp il ] n. 飞行扰流板
15. brake [breik ] n. 刹车; 制动装置
16. power transfer unit 动力转换装置
17. engine driven pump 发动机传动泵(EDP)
18. electric motor driven pump 电动马达传动泵(EMDP)
19. shutoff [ t :f ] n. 关闭;切断
20. shutoff valve 截流阀
21. reservoir [ rezvwa: ] n. 油箱
22. pressure filter 压力过滤器;增压管道过滤器
23. relief [rili:f ] n. 消除;释放;降压减轻
24. lubricate [ lju:brikeit ] v. 加润滑油,润滑
25. exchanger [ iksteind ]n. 热交换器
26. return [ri't:n ] v.; n. 返回
27. trailing edge [treili ] [ed ] 后缘
28. leading edge [ li:di ] [ed ] 前缘
29. alternate [ :lt:neit ] a. 交替的;备用的
30. keel beam [ ki:l ] [ bi:m ] 龙骨;
31. guarded switch [ ga:did ] [swit ] 带保护罩的开关
32. knot [n t ] n. 节( =海里/小时)是速度单位
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航空工程英语基础（中英文对照）(14)
