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indication have started, what will happen?
11. When is mode 5 automatically rearmed ?
12. How many aural message are there? what ary they?
EXERCISE
A. Find out the explanations of the following words in your
“English-chinese technical dictionary”
1. Go- around (GA) [ P1-70 ]
2. Windshear [ P1-171 ]
3. misssed approach [ P1-101 ]
4. exceedance [ P1-54 ]
5. headwind [ P1-74 ]
6. tailwind [ P1-149 ]
B. Translate the 1st and 3rd paragraphs of lesson 33 into chinese.
C. Explain the following abbreviations
1. FAA
2. GPWS
3. GPWC
4. G/S
D. Answer the questions 1～12 that are given for lesson 33 reading
material.
LESSON 34
YAW DAMPER
VOCABULARY
1. oscillation [ si'lein ] n. 擺動;振蕩
2. subsonic jet [ 'sb's nik ][d et ] 亞音速噴氣機
3. oscillatory [ si'leitri ] a. 擺動的振蕩的
4. dutch roll [ dt ] 荷蘭滾;擺動;飄擺
5. sweep back angle 后掠角
6. gust wind [ gst ] 陣風;驟風
7. sideslip [ 'saidslip ] n. ; vi.側滑
8. sufficiently [ s'fintli ] ad. 充分的;足夠地
9. objectional [ b'd eknl ] a. 有害的
10. damping [ 'dæmpi ] n. ; a. 阻尼;阻尼的
11. inoperative [ in' prtiv ] a. 無效的;不工作的
12. displacement [ dis'pleismnt ] n. 位移;移動
13. oppose [ 'pouz ] vt. 反抗;對立;與…對抗
14. yaw rate [ j : ][reit ] 偏航角速度
15. electromechanical [ i'lektroumi'kænikl ] a. 機電的;電動機械的
16. rate gyro [ 'd airou ] (角)速度陀螺;阻尼陀螺
17. yaw damper actuator 偏航阻尼器作動筒(執行元件)
18. series [ 'siri:z ] a. 串聯的; n. 串接;紐;套;系列
19. time-delay relay 延時繼電器
[di'lei]['ri:'lei]
20. inform [ in'f :m ] v. 通知
21. verification [ verifi'kein ] n. 檢查;核實
22. ASA = Autoflight status annunciator 自動飛行顯(指)示器
['steits]['nnieit ]
23. solid state [ 's lid ][steit ] 固態
24. subassembly [ 'sb 'sembli ] n. 配件;組合件
25. weigh [ wei ] v. 重(多少); 稱量
26. weight [ weit ] n. 重量;重力;載重
27. cancel [ 'kænsl ] n. 取消;刪去
28. precaution [ pri'k :n ] n. 預防(保護)措施
29. spin down 旋轉減慢
30. isolate [ 'aisleit ] vt. 隔離
31. trouble [ 'trbl ] n. 故障;苦惱
32. Minimum Equiment List (MEL) 最低設備(放行)清單
33. dispatch [ dis'pæt ] vt. ; n. 簽派
34. exercise [ 'ekssaiz ] v. 使(利)用;行使;使活動
TEXT
[1] In flight, airplane's oscillations about the yaw axis are common to all
subsonic jets. This oscillatory condition which
is called “dutch roll”due to low drag and high
speed aerodynamic design (wing sweep back
angle is about 35). Figure 34-1 illustrates the
“dutch roll”of an airplane.
The airplane moving to the right of the flight
path is caused by gust wind, the tail moves right,
this condition is called “right sideslip ”.when
the airplane sideslip right, the right wing
increases lift and drag, the airplane rolls left and
yaws right, bank moves to the left of the flight
path. Once the “left sideslip ”occurs, the tail
moves left of the flight path, the left wing
increases lift and drag, the airplane rolls right
and yaws left and then bank moves to the right
of the flight path. The airplane is sometimes
sideslipping left and sometimes sideslipping
right, which results in the dutch roll. Dutch roll
is sufficiently objectional without damping so
that most subsonic aircraft are speed and
altitude limited if their yaw dampers are
inoperative.
Fig. 34-1 dutch roll
[2] The yaw damper minimizes dutch roll by controlling rudder
displacement to oppose the yaw rate of the airplane. An
electromechanical rate gyro in the yaw damper coupler sense yaw rate of
the airplane and generates a command to oppose the yaw. The yaw
damper actuator components of the rudder power control unit moves the
rudder  3 degrees in response to this command signal.A position signal
from the rudder power control unit provides feedback to the yaw damper
indicator. The yaw damper indicator shows rudder movement due to yaw
damper inputs. The rudder pedals do not move when the yaw damper
moves the rudder because the yaw damper actuator is a series hydraulic
actuator.
Fig. 34-2 yaw damper
[3] The yaw damper engage switch sends a signal to the integrated flight
system accessory unit (IFSAU) to engage the yaw damper. The IFSAU
　
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