LS-601/AI Crew Intercommunication System (ICS) Panel

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. 1-4