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two static line. The static line and
auxiliary static line of the captain's
probe and no. 1 aux probe are
interconnected, static line of first
officer's probe and no.2 aux probe are
also interconnected. These static line
are interconnected to average the
ambient
pressure in the static lines which reduces static errors during turns or turbulence.
[6] At the end of this lesson we will take the standby airspeed indicator as an
Fig. 30-5 pitot/static system schematic
example to show the use of pitot/static pressure. The standby airspeed indicator
is pneumatically driven by both pitot and static input from the pitot-static system
over a range of 60-450 knots.
Fig. 30-6 standby airspeed indicator
The indicator mechanism is contained in an airspeed capsule having two
pressure ports: one for static pressure, supplied to the capsule interior; and the
other for pitot pressure, supplied to the diaphragm interior. Diaphragm response
to differential pitot-static pressure is substantially linear with indicator's needle.
The faster the airplane flies ,the greater the difference between pitot and static
pressure. A link connects the moveable portion of the diaphragm to the rocking
shaft assembly. A sector gear on the rocking shaft drives a pinion gear, the shaft
of which protrudes through the center of the dial and serves as the pointer
mounting shaft.
EXERCISE
A. Find out the explanation of the following words in your "English-chinese
technical dictionary"
1. pitot static tube [ P1-113 ]
2. static port [ P1-143 ]
3. flange [ P1-60 ]
4. turbulence [ P1-162 ]
5. diaphragm [ P1-42 ]
B. Translate lesson 30 first ,third, and fourth paragraph into chinese.
READING MATERIAL
READING MATERIAL
LESSON 31
AIR DATA SYSTEM
VOCABULARY
1. altitude rate [ 'æltitju:d ] [ reit ] 上升率; 高度變化率
2. mach number [ ma:k ] [ 'nmb ] 馬赫數
3. ATR = Austin Trimbull Radio 是一家無線電公司
4. toggle switch [ 't gl ] [swit ] 搬扭開關;撥動開關
5. process [ 'prouses ] n. 過程;步驟;方法
6. baro = barometric [ bær'metrik ] a. 氣壓(計)的
7. Total Air Temperature 總氣溫
8. momentarily [ 'moumntrili ] ad. 瞬時; 暫時
9. hexadecimal [ 'heks'desiml ] a. 十六進制
10. properly [ 'pr pli ] ad. 適當的; 正常地
11. graphic [ 'græfik ] a. 用圖表示的;n. 圖解;圖
12. period [ 'pirid ] n. 周期;期間;時間間隔
13. nonvalatile memory [ n n'v ltail ]['memri ] 非易失性存儲
器
14. in order [ ' :d ] 按順序
15. preceding [ pri'si:di ] 以前的;先前的
16. round [ raund ] a; n 園形的;園形物
17. set knob [ n b ] 調定旋鈕
18. cursor [ 'k:s ] n. 游標
19. NEG = negative [ 'negtiv ] a. 負的;n. 負數(值)
20. pointer [ 'p int ] n. 指針
21. revolution [ rev'lju:n ] n. 一圈一圈地旋轉
22. increment [ 'inkrimnt ] n. 增量
23. VMO = Velocity [vi'l siti] Maximum Operating
最大(允許)飛行速度
24. index marker [ 'indeks ]['ma:k ] 指示標記
25. diameter [ dai'æmit ] n. 直徑
radius [ 'reidjs ] n. 半徑
26. servo [ 's:vou ] a. 伺服的, n. 伺服機構(傳動系動)
27. maximum programmed value 最大設計值
28. programming pins 程序銷釘
TEXT
[1] Air data computer system provides air pressure and temperature
related data. The air data computer (ADC) receives pitot and static air
pressure from the pitot probes. It uses the static pressure to compute the
altitude and altitude rate, and the difference between static and pitot
pressure to compute the airplane's airspeed. The computed altitude and
airspeed are then used to compute the mach number.
Fig. 31-1 Air data system
[2] The air data computer
is enclosed in a 1/2 ATR
long case. On the front of
the unit there are two
pneumatic connectors, a
toggle switch for
checking current status or
past history data and a
display window for
showing test results.
ADC uses a digital
microprocessor to
process pitot pressure,
static pressure and total
air temperature to
produce the required air
data information. the
ADC provides altitude,
altitude rate, baro
corrected altitude,
computed airspeed, mach,
true airspeed, total air
Fig. 31-2 Air data computer temperature, static air
temperature, and total and static air pressures to the various indicators
and systems. The air data signals are sent to other systems in analog and
digital formats. The digital information is transmitted using ARINC 429
　
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