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Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual
190-01112-10
Rev. 21
Page 102
Figure 4-61 GAD 29/29B Aluminum Tape Installation (GAD 13 similar)
4.5.3
Aluminum Surface Preparation
In order to prepare the aluminum surface for proper bonding, the following general steps should be
followed. For a detailed procedure, reference SAE ARP1870, Sections 5.1 and 5.5.
1.
Clean grounding location with solvent.
2.
Remove non-conductive films or coatings from the grounding location. When area is cleaned
around fastener heads or washers the area cleaned should be 0.125 inches wider than the foot
print of the washer or the bolt head.
3.
Apply a chemical conversion coat such as Alodine 1200 to the bare metal.
4.
Once the chemical conversion coat is dry, clean the area.
5.
Install bonding aluminum tape or equipment at grounding location.
6.
After the bond is complete, if any films or coatings were removed from the surface, reapply a
suitable film or coating to the surrounding area.
4.5.4
Bonding Strap for G5 and GMU 11
A bonding strap is required for the G5. A bonding strap is optionally required for a GMU 11 mounted in a
non-metallic wingtip (see APPENDIX D for specific requirements); and is required for a GMU 11
mounted in any other aircraft location. Use the following guidance to create a bond strap for the required
installations. The bonding strap must be
less than 10 inches in length
and must be connected from the
backshell to a #10 ground stud. Below is a list of approved metal braids with their accompanying terminal
rings that can be used to create these bonding straps.
Table 4-9: Bonding Strap Potential Part Numbers
Bonding strap part numbers
Braid Part Number
Ring Terminal Part
Number
Braid Part Number
Ring Terminal Part
Number
QQB575*36*375
MS25036-112 (#10) or
MS25036-156 (#8)
AA59569*36*0375
MS25036-112 (#10) or
MS25036-156 (#8)