Flightcom 403 Installation & Operation Manual page 9

Wiring Suggestions
To wire the 403 and 403d intercoms:
1. Using a 25 watt soldering iron and 20 or 22 gauge Teflon-coated wire, make solder connections that are
insulated with heat shrink tubing (page 6, Figure 8) and (page 4, Figure 6) for connector pin numbers and
connection information.
2. Carefully route all wires away from aircraft controls, so that wires do not chafe on or come in contact with
control cables, push rods, trim actuators, chains, flap followers, or other moving devices, and:
• Avoid bundling wires with an RF inverter, coaxial cables, or synchro wiring.
• Use shielded wire for microphone, headphone, and audio wiring.
• Connect the intercom power lead (pin 20) to a circuit breaker on the Avionics Power Bus, not to the
Flight Instrument Power.
• Avoid circuits with motors, strobes, or other "noisy" devices.
NOTE: numbers are located on the solder terminal side of the 25-pin D-sub connectors.
If you are not sure where to obtain power, consult with an avionics shop before continuing.
Wire Connection Code
The connector pin numbers indicated in the following table correspond to the numbers on the D-sub connector
included with the 403 and 403d intercoms.
Connector Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
The stereo connection schematic includes a third person radio transmit connection. Delete the connection
to pin number 5 when only installing a two-place radio transmit system, which is the most common
pilot/co-pilot configuration (page 4, Figure 6).
Intercom Function
Ground
Mic Audio
Mic Audio
Mic Audio
Navigator Key
Co-pilot Key
Pilot Key
Xmit Key
ICS Audio A
ICS Audio B
ICS Audio A
ICS Audio B
Mic Return
Mic Audio
Mic Audio
Mic Audio
Xmit Audio
Aux Input A
Aux Input B
Power In
Recv Audio
DCR Power
Active LED
Start
Record
Aircraft Connection
Avionics ground point
Pilot
Co-pilot
Navigator or Passenger #1
Navigator PTT switch
Co-pilot PTT switch
Pilot PTT switch
Com radio keyline
Pilot headphone
Pilot headphone
Passenger headphones
Passenger headphones
All mic jacks
Passenger #2
Passenger #3
Passenger #4
Com radio
Music system
Music system
12 to 28 volts, 1 amp breaker
NavCom or Audio panel
DCR indicators
Amber LED
Start button
Play/Record switch (Red LED)
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