Figure 1-2.-LS-601/AI crew control panel.
LS-601/AI Crew Intercommunication System
(ICS) Panel
Each of the crew members has a LS-601/AI ICS
panel (fig. 1-2). These ICS panels enable the crew
members to do the following:
l Select six ICS modes
l Select three radios to monitor
l Select navigation aids and IFF to monitor
l Select either hot microphone or push-to-talk
keyline operation
l Control the volume for ICS, radios, navigational
aids, and the IFF aural functions
Control signals from the crew’s ICS control panels
consist of multiplexed binary words in the Manchester
format and hard wired ground and analog voltages.
The crew’s control panel has 14 switchlights that are
self-explanatory. The two volume knobs are
dual-purpose knobs. Each one controls two volumes,
depending whether you turn the inner or outer knob. The
BITE indicator will illuminate when a fault is detected
in the control panel.
Each panel is identical, and they can be swapped
between stations. There are differences in operation,
depending on the station. The SENSO station cannot
transmit so the XMIT SEL switchlight is disabled at that
station. The ALT ICS switchlight will place the pilot and
copilot’s headsets and microphones in parallel. The
SENSO and TACCOs will similarly be tied together as
a pair. The NORM BK UP switchlight only operates at
Figure 1-3.-LS-602/AI control panel.
the pilot and copilot’s stations. The pilot will connect
directly to the UHF-1 radio, and the copilot will connect
directly to the HF system.
LS-602/AI Control Panel
There are three LS-602/AI panels (fig. 1-3) located
in the aircraft. These panels are for maintenance/ground
handling functions. They provide the communication
between the outside of the aircraft and the crew stations.
The only control located on this panel is a volume knob,
which adjusts the volume in the headset for each
individual panel.
CV-3048( )/AI Converter-Interconnecting Box
The CV-3048( )/AI is the switching logic unit (SLU)
for the intercommunication system. The SLU is the
signal interface unit for the communication system. Its
functions are as follows:
Voice signal conditioning
Receive/transmit mode control
Antenna configuration control
Signal switching between components
Binary control signal coding and decoding
Component mode forcing
FUNCTIONAL DESCRIPTION
This intercommunication system uses various
computer-formatted signals in its operation. As a senior
technician, you will be required to understand the
various types of languages used by this system.
Intercommunication-Communication Control
Group (ICCG) Signal Interface
The ICCG signal interface consists of a discrete
hardwired signal interface and a multiplexed binary
word signal interface. Each will be discussed in the
following text.
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