Flightcom 403mc User Manual

PTT Switches for
1-2 places
Optional
HEADSET JACKS
for 2-4 Places
Aircraft Radio
Optional Audio Panel
MUSIC
Optional
ALL
ISO
Squelch
Front Panel
Volume
Microphone
Jack
Headphone
Jack
Standby Jacks
Model 403mc Voice Activated INTERCOM
1
INSTALLATION/OPERATION MANUAL
PLEASE READ THIS MANUAL THOROUGHLY
BEFORE USING THE INTERCOM
and consult with your A & P Mechanic or Certified
Repair Station prior to installation.
OPERATING PROCEDURES
Plug headsets into the proper intercom jacks. When using
stereo headsets, put the stereo/mono switch in the mono
mode. Turn on the aircraft master switch and avionics master,
if so equipped.
Initially set the intercom volume control to the 11 o’clock
position and the squelch control to the 3 o’clock position. Turn
up each headset volume all the way and position your boom
mic 1/8" from your lips and at the corner of your mouth for
best results. Noise canceling mics will not operate correctly if
they are more than 1/8" from your mouth. While speaking
loudly, adjust the intercom volume control to a comfortable
listening level.
SYSTEM OVERVIEW
The Flightcom Model 403mc intercom is a monaural unit compatible with most
aviation headsets. Installation of up to four stations is possible using optional
jacks. The unit provides two station radio transmit capability.
Fig. 1 Typical Connection Configuration
Fig. 2 Correct Placement of Boom and Mi c
Squelch Control: The squelch control should be set as far clockwise as possible while still blocking the background noise. When adjusting
the squelch, be sure no one is talking. Re-adjust this setting in flight to compensate for different noise levels.
Note: If the squelch is set too high (counter-clockwise) your voice will be cut out unless you talk very loudly. If the squelch is set too low
(clockwise) the background noise will be heard occasionally.
ZERO to 1/8"
from mouth

Flightcom 403mc Specifications

General

Brand	Flightcom
Model	403mc
Category	Intercom System
Language	English

Summary

System Overview

System Overview

Describes the Flightcom Model 403mc intercom and its capabilities.

Operating Procedures

Initial Volume and Squelch Setup

Set initial volume to 11 o'clock and squelch to 3 o'clock. Adjust volume while speaking loudly.

Squelch Control Operation

Set squelch clockwise to block noise; re-adjust in flight for optimal performance.

Radio and Muting Features

Radio Use and Pilot Isolate Switch

Explains radio transmission and pilot isolation via the ISO switch.

Failsafe and Muting Functions

Details intercom failsafe, music muting, and intercom muting features.

Complete Radio Priority

Describes how to set up radio to override all other audio.

Installation Guide

Intercom Mounting Options

Instructions for in-panel or under-panel mounting of the intercom unit.

Headphone and Microphone Jack Installation

Guidance on drilling and connecting headset jacks for each station.

Wiring and Troubleshooting

Intercom Wiring Instructions

Details wire gauge, routing, and power connection requirements for installation.

Troubleshooting Common Issues

Addresses issues like no transmission, dead unit, whine, or poor squelch.

Specifications and Parts

Technical Specifications

Lists size, weight, output, power requirements, and warranty details.

Parts List

Enumerates the components included with the intercom system.

Wire Connection Guide

Details connector pin numbers and their corresponding intercom functions.

Warranty Information

Warranty Policy

Outlines the terms and conditions of the one-year limited warranty.