Maintenance Manual 190-02472-02G3X Touch EFIS Part 23 AML STC Revision 2Page 294.4 Visual InspectionOperation of the G3X Touch system is not permitted unless a visual inspection, as described in thissection, has been completed within the preceding 12 calendar months. Check for corrosion, damage, orother defects for each of the G3X Touch LRUs. Replace any damaged parts as required. Inspection mayrequire the temporary removal of a unit or units to gain access to connectors. Follow guidance in Section6 for equipment removal and replacement.Conduct the following visual inspection of the G3X Touch EFIS system LRUs and associated wiringharnesses to ensure installation integrity:1. Inspect all units for security of attachment, including visual inspection of brackets and othersupporting structure attaching all units to the airframe.2. Inspect all switches, annunciators, knobs, and buttons for legibility.3. Inspect displays for legibility and acceptable brightness. Reference Section 5.3.1.4. Visually inspect each unit’s wiring (including electrical bonding straps), overbraid, and connectorsfor chafing, deterioration, damage, or wear.5. Visually check for any signs of corrosion.4.4.1 Aluminum Foil Tape (Non-metallic Aircraft Only)Any aluminum foil tape if used in the G3X Touch installation for grounding of a GSU 25D, GEA 24, GAD29B or GAD 27, (refer to Appendix A of this document) must be inspected every 12 calendar months.The inspection must verify that the foil tape is not torn, damaged, or showing signs of corrosion. If any ofthese conditions are found, the tape must be replaced in accordance with Section 4 of G3X Touch EFISPart 23 AML STC Installation Manual.4.5 Electrical Bonding TestG3X Touch EFIS LRU electrical bonding must be checked every 2,000 flight hours or 10 years, whicheveroccurs first.4.5.1 Requirements Disconnect any cables and connectors normally attached to the LRU. Resistance must be measured from a bare metal portion of the LRU to an airframe groundinglocation.The airframe grounding location should be as close to the LRU as possible, unless otherwise noted inTable 4-2.4.5.2 Test EquipmentCalibrated 4 wire Milliohm meter and Kelvin probes are required for this test.4.5.3 Electrical Bonding Test Procedures. Using a calibrated milliohm meter and Kelvin probes measure the resistance of each G3X TouchLRU between the locations noted in Table 4-2, and record the result of each installed LRU. Some equipment on the list are optionaland may not be installed. Ensure the resistance does not exceed 10 milliohms. If the measured resistance is greater 10 milliohms, bonding must be improved to meet applicablerequirements for a new installation in accordance with Section 4 of G3X Touch EFIS Part 23 AMLSTC Installation Manual (190-02472-01).
