INTERPHONE SYSTEM
The Interphone System provides two way communications
between the flight crew members, cabin attendants and maintenance personnel.
The system is classified as two subsystems, the service interphone and the
flight interphone.
A. Service Interphone System
The service interphone system provides
communication between around crew personnel. Cockpit crew and cabin attendants.
The system is composed of an amplifier, a number of handset jacks located
through out the airplane, handsets at the attendant's stations and associated
microphones & loudspeakers at the flight crew stations. The handset jacks
are connected to the service interphone amplifier through a service interphone
switch. This service interphone switch is placed to the OFF position before
take off to avoid any interference with the communication systems. The
attendant's stations are connected directly to the service interphone
amplifier. The flight crew stations are connected to the service interphone
amplifier provided that proper selection on their associated audio selector
panels has been mode.
Out put of the service interphone amplifier is
fed to all the service interphone stations.
B. Flight Interphone System
The flight interphone system provides inter
communication between the control cabin crew members. In some aircrafts
control cabin crew members can communicate with certain service interphone
handset jacks (specially the jack located at the external power panel) through
the flight interphone system.
The system has a separate flight interphone
amplifier which amplifies the interphone audio signals and delivers it to all
the flight interphone stations.
Associated
with the interphone
system the following.....
Audio Selector Panel (ASP)
Each flight
crew member (captain, copilot,
engineer, observer . . .}
has an
audio selector panel. Sometimes
the electronic compartment is provided
with an audio
selector panel. The
audio selector panel allows
the flight crew members to
select any communication facility {interphone, passenger
address, HF, VHF...}
for transmission or
reception or both
transmission & reception.
Also the ASP
allows monitoring of all
navigation receiver's call
signs (identification tones) such
as ADF, VOR,
DME, marker, etc.
Microphones
Most aircrafts are
equipped with:
Handheld mike
with a PTT
in the mike
assembly .
Boom
mike integrated with
the complete headset.
Oxygen (oronasal)
mask mike in
the oxygen mask .
When
using boom or
oxygen mikes PTT
is made either
from the audio selector panel
or the control
wheel (for pilot
& copilot).
Loudspeakers
Pilot
& Copilot are provided
with loudspeakers at the
cockpit ceiling to permit monitoring
of- radio signals without
wearing head-phones.
Radio
signals can be heared also
in headphones and
headsets. Other audio signals
can be heared in the telephone
headsets.
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