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5 The pitot static probes, temperature probe and alpha vanes provide air data
information to the various using system, they are located on the left and right
sides of the forward fuselage. Since all the probes and vanes are exposed to the
airstream, internal heating is provided to prevent ice formation. Freezing could
cause faulty inputs or possible loss of all data.
6 The drain anti-icing system prevents ice buildup on the drains from the toilets
and lavatory sinks. The aft toilet drain heater is embedded in a gasket between the
drain tube and the drain outlet fitting.The lavatory sink drain heater are integrated
with the drain mast.The power supply for the toilet drain heaters is 115 volts ac and
for the lavatory sink drain is 115 volts ac or 28 volts ac.
EXERCISE
A. Find out the explanations of the following words in your "English-Chinese
technical dictionary".
1. drain valve  P1-48 
2. pitot tube  P1-114 
3. static pressure  P1-143 
4. alpha vane  P1-7 
5. airfoil  P1-6 
6. gasket  P1-67 
7. angle of attack [ P1-10 ]
8. leading edge [ P1-81 ]
9. slat [ P1-137 ]
B. Read the text loudly and clearly.
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LESSON 8
THE POTABLE WATER SYSTEM
VOCABULARY
1. potable water  pUtbl   w :t  飲用水
2. waste  weist  n. 廢料v. 浪費
3. is composed of ……  kmpuzd  由……組成
4. tank  tk  n. 油箱;水箱
5. quantity  kw ntiti  n. 數量; 量
6. construct  knstrkt  vt. 建造;制做
7. bracket  brækit  n. 支架;托架
8. U. S.gallon  gæln  = 3.785 公升
imperial gallon = 4.546 公升
9. cylindrical  silindrikl  a. 園筒形的
10. blanket  blækit  n. 覆蓋層
11. fill line 充注管道
12. overflow line 外泄管道
13. quantity transmitter 水量傳感器
14. capacity  kpæsiti  n. 工作容量;容積
15. reed  ri:d  n. 簧片
16. diode  daiud  n. 二極管
17. float  flut  n. 浮子;浮標
18. magnet  mægnit  n. 磁鐵
19. surround  sraund  vt. 圍繞;包圍
20. label  leibl  vt. 標記為;標明
21. associated  suieitid  a. 關聯的;聯結的
22. corresponding  k risp ndi  a. 相應的;對應的
23. emptiness  emptinis  n. 空
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TEXT
1 The potable water system supplies potable water to the galleys and lavatories.
The waste system is for storing and removing waste from the toilets. The water and
waste system is composed of independent but related systems.
2 The potable water system consists of a water tank, quantity indication,
pressurization components,and distribution tubing.The water tank and
pressurization components are located aft of the aft cargo compartment. The
quantity indication is in the aft section of the passenger cabin.
Fig 8-1 potable water system
3 The water tank stores potable water for use by the passengers and crew. The
tank is constructed of fiberglass and attached by struts and mounting brackets to the
airplane structure. The 30 U.S. gallon tank is cylindrical. It is protected from
freezing by a 3-pieces fiberglass blanket. On the upper section of the tank are
connections for the air pressure line, fill line, overflow line, supply line, and a
quantity transmitter. The fill and overflow valve is used to fill the tank to the
capacity determined by a standpipe, this valve is operated by a handle. A drain
valve is located on the bottom of the tank .
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Fig 8-2 water tank
4The quantity indication shows the amount of water in the tank. The quantity
transmitter consists of 10 reed switches and 3 diodes inside a tube. A float with 3
magnets surrounds the tube. In addition, the indicator consists of 5 lights labelled E,
1/4, 1/2, 3/4 and F, and a push button. The amount of water in the tank determines
the position of the float. The magnets on the float close the associated reed switches.
Using the push button on the quantity indicator, allows the corresponding quantity
lights to illuminate. If the tank is emptiness, the E light is illuminated, if the tank is
　
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