Garmin GRA 55 Maintenance Manual - Page 24

Item Visual Inspection Description/Procedure Interval The GRA mount, unit and wiring harnesses should be inspected to ensure continued integrity of the installation in alignment with Chapter 5, under the relevant section covering 100-Hour and Annual Inspections of applicable Bell 206B, 206L series Model Maintenance Manual. Perform a visual inspection of the GRA unit, unit mount, and wiring harnesses to verify integrity. 1. Inspect the GRA unit for security of attachment, including visual inspection of the mounting rack and rotorcraft support structure to which the rack is attached. Verify the fastener heads are in full contact with unit mounting rack and re-torque 20 to 25 in-lbs if required. 2. Inspect GRA55/5500 unit, unit mounting rack, and rotorcraft support structure for signs of corrosion and apparent signs of damage. If corrosion is found, treat affected areas in accordance with Chapter 3 of BHT-ALL-SPBM Bell Helicopter Standard Practices Manual, Revision 2, or later approved revision. If damage to GRA unit support structure is found, repair as required in accordance with BHT-206-SRM-1 Structural Repair Manual, Revision 3, or later approved revision. 3. Inspect placards and all labels. Ensure that they are legible and properly adhered. Damaged placards and labels should be replaced as necessary. 4. Inspect wire and shield terminations, condition of wiring harness, routing, and security of its attachment/clamping to rotorcraft structure. Check for chaffed or damage wires and ensure overall functionality of wire installation. 5. Inspect all system connectors for bent/broken or recessed pins. Inspect connectors for FOD. To be performed in alignment with Bell 206B, 206L series maintenance schedule. Every 100 flight hours or every 12 months, whichever comes first. 190-01277-A3 Rev. 1 System Maintenance Manual GRA 55/5500 Bell 206 STC Page 4-4