Configure The Integration Of Digital Intercom System For Observer Trainer Aircraft

Abstract: An electronic circuit (Figure-2) for configuration of Digital Intercom system on observer trainer aircraft having new Audio Control Units (ACU-7 & ACU-8) and Audio Processor Unit APU-1 (1) comprising of two IC Call switches (2,3) and two IC call indicators (4,5) one each associated with each new ACUS (ACU-7 & ACU-8). One terminal of external IC call switches (2,3) is permanently connected to ground wherein second or another terminal of these IC call switches (2,3) is connected to APU-1(1). One terminal of external IC call indicator (4,5) is permanently connected to 28 VDC supply (6 & 7) respectively wherein second or another terminal of these IC call indicator (4,5) is connected to APU-1(1). Activation of any of these external IC call switches (2,3) activates grounding at AP cup - (1) which results in illumination of these IC call indicators (4,5) to provide optical alerts to new observer trainers in aircraft cabin.

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