Installation Overview190-01499-02 GTX 3X5 Transponder TSO Installation ManualRev. 9 Page 3-273.16 Electrical BondingMake sure the transponder and GPS antennas are electrically bonded to the aircraft.3.17 Cabling and WiringUse AC 43.13-1B chapter 11, sections 8 through 13 to install wiring. The considerations are:1. It should not be possible for the cable harness to be exposed to wire chafing.2. The cable harness should not be located near flight control cables, high capacity electrical lines (e.g., DC electricmotor cables), or fuel lines.3. Do not put cables near high energy sources (e.g., DC motors, high heat sources).4. Wiring that must be shielded must be done as shown in appendix D.5. Shield pigtail lengths must be less than 3.0 inches.3.18 Electrical Bonding ConsiderationsBond electrical equipment, supporting brackets, and racks to the aircraft’s main structure. When surface preparation isnecessary to get an electrical bond refer to SAE ARP 1870 section 5. To measure the resistance of the bond betweenthe equipment and the adjacent aircraft structure use a calibrated milliohm meter. The bond must have a DC resistanceno more than 2.5 milliohms.3.19 Cooling Requirements and ConsiderationsThere are no cooling requirements or considerations for the GTX 3X5. The chassis has provisions for a fan, however,one is not necessary or provided.
