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to talk and listen. At the lower left corner of figure 42-1, the airplane
servicing stations are shown. The interphone jacks are located at 7
servicing stations on the airplane. Figure 42-2 shows these jacks
position.
Fig. 42-2 interphone jack locations
[2] Figure 42-3 illustrates the service interphone system block diagram.
Two 28 volt dc power sources supply power to the system through a
single INPH AND WARN circuit breaker on the P6 panel. Attendants
may communicate with each other or with crew member in the flight
compartment by using the
handset at their station. The
equipment used by the flight
crew may be either a control
stand handset or headsets and
microphones (including oxygen
mask microphone and hand hold
microphone), all of these are
controlled by the audio
control panels. The
service interphone
switch connects the
microphone lines of the service
station jacks to the service
interphone system. The switch is
a toggle switch with ON and
OFF positions. When the switch
is on the ON position, the
microphone lines from the
service station jacks are
connected to the service
interphone system enabling
communication between all
stations. In the event of a faulty
service jack, the flight crew can
position the switch to OFF and
prevent the jack from interfering
with interphone communication.
[3] The crew call system is a three-way alerting system that signals crew
members to use the interphone system. Three types of crew call systems
are as follows:
captain call ------- a HI tone chime sounds and the captain's CALL
light comes on to advise the pilots that a call has been made from the
cabin attendants or the ground crew.
Attendant call ------ a two-tone chime sounds and the pink master call
lights come on when an attendant call is made from the flight
compartment or any attendant panel (the handsets are located on
forward and aft attendant panels).
Ground crew call ----- when the ground crew call switch is pushed in
the flight compartment, a horn comes on in the nose wheel well
where it can readily be heard by ground service personnel.
Fig. 42-3 SVS INT block diagram
Fig. 42-4 flight and ground crew call system
[4] Figure 42-5 illustrates the crew call system component locations.
Fig. 42-5 crew call system component locations
The ground crew call horn is located at the forward end and inside of
the nose wheel well.
The external power panel is located just forward of the nose wheel
well on the right side of the airplane.
The master call lights are on the forward and aft exit locator sign
located on the passenger cabin ceiling.
The forward attendant panel is located in the forward service area.
The attendant call relay is located behind the forward attendant panel.
The aft attendant panel is located in the aft service area.
Questions to Lesson 42
1. What is the use of the service interphone?
2. How is a crew member connected to the service interphone system?
3. Where are the 3 handsets installed?
4. What are these handsets used to ?
5. What does the handset resemble?
6. What is the use of the pushbutton switch located on the grip?
7. How many interphone jacks are located on the airplane? What are
they?
8. In communication, what equipment is used by the flight crew?
9. The service interphone switch is a toggle switch with ON and OFF
position. When the switch is on the ON position, what will happen?
10. What is the purpose of crew call system ?
11. If a call has been made from the cabin attendants or the ground crew,
how to advise the pilot?
12. What is meant by a two-tone chime sounding and the pink master call
lights coming on?
13. In the flight compartment, when the ground crew call switch is
pushed what will happen?
14. Where is the ground crew call horn located?
15. Where are the master call lights located?
16. Where is the attendant call relay located?
EXERCISE
A. Find out the explanations of the following words in your "
English-Chinese technical dictionary" ( cancel, because no corresponding
words can be found in Boeing dictionary)
B. Translate Paragraph 1 and 2 of Lesson 42 into Chinese
C. Explain the following abbreviations and acronyms.
1. PROV
2. MIC
3. STA
4. EXT
5. INT
6. SVS INT
D. Answer the questions to Lesson 42 (in Chinese).
LESSON 43
VOICE RECORDER AND
DIGITAL FLIGHT DATA RECORDER
VOCABULARY
1. voice recorder [ v is] [ ri'k :d ] 话音记录器
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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航空工程英语基础（中英文对照）(73)
