Garmin GIA 63 Installation Manual

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190-00303-05 GIA 63 Installation ManualRev. Y Page 2-112.4 Cabling and WiringRefer to the interconnect examples in Appendix C for wire gauge guidance.In some cases, a larger gauge wire such as AWG #16, #18, or #20 may be needed for power connections.Special thin-wall heat shrink tubing is also provided to insulate the extended barrels inside the backshell. Ifusing AWG #16 or #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to eachother. This minimizes the risk of contacts touching and shorting to adjacent pins and to ground.Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI interference.Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling androuting near aircraft control cables.Coaxial cable with 50 Ω nominal impedance and meeting applicable aviation regulations should be usedfor the installation. A typical maximum cable length for the GPS antenna is 40 feet. The installer shallinsure that the attenuation does not exceed 10 dB at 1.5 GHz for the GIA 63, and falls between 3 dB and7 dB inclusive at 1.5 GHz for the GIA 63W or GIA 63H.Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling,particularly the COM antenna cable, and routing near aircraft control cables. Cabling for the GIA 63(X)should not be routed near components or cabling which are sources of electrical noise. Do not route theCOM antenna coax near any ADF antenna cables. Route the GPS, VOR/LOC, and Glideslope antennacables as far as possible away from all COM transceivers and antenna cables.2.5 Cooling AirThe GIA 63(X) meets all TSO requirements without external cooling. However, as with all electronicequipment, lower operating temperatures extend equipment life. On the average, reducing the operatingtemperature by 15-20 °C (25 to 35 °F) doubles the mean time between failure (MTBF). Recommendedairflow rating is 1 CFM (cubic foot per minute) at a pressure equivalent to 0.1 inches of water. Potentialdamage to your GIA 63(X) may occur by using outside forced air to cool the equipment. Therefore, it isrecommended that an electric forced air fan be installed, of the indicated rating, to cool this equipment.Units tightly packed in the avionics stack heat each other through radiation, convection, and sometimes bydirect conduction. Even a single unit operates at a much higher temperature in still air than in moving air.Fans or some other means of moving the air around electronic equipment are usually a worthwhileinvestment. A 5/8” diameter air fitting is provided on the rear of the mounting rack for the purpose ofadmitting cooling air under such conditions. If a form of forced air cooling is installed, make certain thatrainwater cannot enter and be sprayed on the equipment. Refer to the G1000 System Installation manual,Garmin part number 190-00303-00, for information on cooling requirements.