190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-19
2.3 Wiring/Cabling Considerations
Section 23 lists the pin information for all LRU connectors. Section 23 lists the connector (including
configuration modules) installation information. Section 24 through Section 29 contain interconnect
drawings for all required/optional LRUs and sensors. These sections, along with Section 3 through Section
21 contain all the information needed to construct the wiring harnesses/cables. It is recommended that
LRUs/sensors be installed before constructing the wiring harnesses and cables.
Use MIL-W-22759/16 (or other approved wire) AWG #22 or larger wire for all connections unless
otherwise specified. The supplied standard pin contacts are compatible with up to AWG #22 wire. In cases
where some installations have more than one LRU sharing a common circuit breaker, sizing and wire
gauge is based on aircraft circuit breaker layout, length of wiring, current draw on units, and internal unit
protection characteristics. Do not attempt to combine more than one unit on the same circuit breaker.
Use MIL-C-27500 (or other approved cable) for all shielded cable connections unless otherwise specified.
HSDB (Ethernet) connections may use either aviation grade Category 5 Ethernet cable, or MIL-C-27500
shielded twisted-pair cable.
RG-400 or RG-142 coaxial cable with 50 Ω nominal impedance and meeting applicable aviation
regulations should be used for the installation.
2.3.1 Wiring Harness Installation
Use cable meeting the applicable aviation regulation for the interconnect wiring. Any cable meeting
specifications is acceptable for the installation. When routing cables, follow these precautions:
• All cable routing should be kept as short and as direct as possible.
• Check there is ample space for the cabling and mating connectors.
• Avoid sharp bends in cabling.
• Avoid routing near aircraft control cables.
• Avoid routing cables near heat sources, RF sources, EMI interference sources, power sources (e.g.,
400 Hz generators, trim motors, etc.) or near power for fluorescent lighting.
• Route the GPS antenna cable as far as possible away from all COM transceivers and antenna
cables.
• Analog Input wires routed too close to spark plugs, plug wires, or magnetos may result in erratic
readings.
The installer shall supply and fabricate all of the cables. Required connectors, pins, etc. are provided with
LRU Installation Kits. Electrical connections for the GMU 22 are made through a round 9-pin connector,
and are made through D subminiature connectors for all other LRUs. Section 23
defines the electrical
characteristics of all input and output signals. Required connectors and associated hardware are supplied
with the connector kit.
Contacts for the connectors must be crimped onto the individual wires of the aircraft wiring harness.
Table 1-8
lists contact part numbers (for reference) and recommended crimp tools.
CAUTION
Check wiring connections for errors before connecting any wiring harnesses. Incorrect
wiring could cause internal component damage.
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