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feet. The second A/P must be engaged in CMD at this point. If a
disconnect occurs above 800 feet, both channels can be re-engaged.
Below 800 feet only a single channel can be re-engaged.
H. Landing ------- At 50 feet, FLARE occurs. The A/P controls the
airplane to reduce vertical speed to -2.5 feet per second at touchdown.
The flight director commands are biased off. At 27 feet R/A or 2.5
seconds after flare (whichever comes first), the A/T retards the throttles
and A/T annunciates RETARD.
I. Touchdown ------- Press the A/P disengage switch on the control wheel.
The A/P red warning light on the FMA flashes and an aural warning is
heard. Press either control wheel disconnect switch or either warning
light assembly to reset the warning. At squat, the A/T transfers to ARM.
At squat plus 2 seconds, the A/T disconnect. There is no warning for
touchdown A/T disconnect. When on ground and the ground speed is
reduced to less than 20 knots, all annunciation is off.
READING MATERIAL
QUESTIONS TO LESSON 40 READING MATERIAL
1. What failures are recorded?
2. What does the inflight fault history include?
3. What is the priority order of flight deck effects?
4. A failure may cause more than one flight deck effect. Is only the
highest priority flight deck effect recorded?
5. What does the failure of FCC cause to appear on the EADI?
6. If the failure of FCC occurs in the air, what is the failure recorded as?
7. What a failure causes the autopilot to revert to control wheel steering?
8. What failures cause the affected F/D display to go bar out of view?
9. What is the meaning of PBOV and RBOV?
10. What are the 2 flight deck effects associated with autopilot engage
problem?
11. What is stored in the inflight fault memory?
EXERCISE
A. Find out the explanations of the following words in your
"English-Chinese technical dictionary".
1. departure control [P1-41]
2. transition [P1-160]
3. top of descent [P1-156]
4. touchdown [P1-157]
B. Translate the 2nd paragraph of Lesson 40 into Chinese.
C. Explain the following abbreviations and acronyms.
1. MASI
2. T/D
3. E/D
4. APP
5. AOC
6. V/S
7. LVL CHG
D. Answer the questions 1~11 that are given for Lesson 40 reading
material.
LESSON 41
AUDIO CONTROL SYSTEM
VOCABULARY
1. audio control system 音频控制系统
2. REU = Remote Electronics Unit 遥控电子装置
3. ACP = Audio Control Panel 音频控制面板
4. service interphone 勤务内话
5. flight interphone [ 'int: foun ] 飞行内话
6. particular [ p 'tikjul ] a. 特殊的; 特别的
7. bypass [ 'baipa:s ] v. 给--- 设旁路
8. microphone [ 'maikrfoun ] n. 话筒; 传声筒(麦克
风)
9. intercom [ 'int: k m ] = intercommunication = I/C
内部通信(系统)
10. press-to-talk (PTT) 按压讲话
11. boom [ bu:m ] n. 吊杆
12. mask [ ma:sk ] n. 面罩
13. jack [ d æk ] n. 插座; 插口; 插塞
14. parallel [ 'pærlel ] 并联; 平行
15. voice range filter 话音/信标/滤波器
16. motherboard [ 'mðb :d ] 母板
17. AAU = Audio Accessory Unit 音频附件盒(装置)
18. horn [ h :n ] 喇叭; 报警器
19. headset [ 'hedset ] 头戴耳机
20. listen [ ' lisn ] vi. ; n. 收听; 监听
TEXT
[1] The digital audio control system provides the communication link
between the flight compartment, passenger cabin, ground, airplane
systems, and recorders. The remote electronics unit (REU) and the audio
control panel (ACP) work together as a complete system. The REU
manages the communications between three flight compartment stations
( captain, first officer, and observer ), service and flight interphone, and
all related electronics equipment. The ACP is the control device through
which the entire system operates, the ACP contains all switches and other
control elements that interface between the operator and the system.
At three flight deck stations, the ACP allows received audio,
navigation signals, volume, and particular transmitter to be selected. If a
system failure occurs, emergency operation bypasses all active circuitry
in the system to maintain communications between the aircraft and
ground stations.
The captain's and first officer's audio control panel are located on the
aft electronics panel (P8). The first observer's ACP is located on the aft
overhead panel (P5). The remote electronics unit is located on rack E2-1
in the electronic equipment compartment.
[2] Figure 41 - 1 shows the audio control panel. There are 7 microphone
selector push buttons on the top of ACP, these buttons direct microphone
audio to the selected communication system. Only one push button can
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航空工程英语基础（中英文对照）(70)
