Figure 4-50 Aluminum Tape Joint - Garmin G5 Installation Manual

8. Fold the end of the tape over twice for added thickness at the prepared grounding
location. Refer to Figure 4-51. Apply 3" wide tape over the seam as shown.
9. The tape shall not have any tears in the joint or along the length of the tape as tears will
degrade the bonding performance.
10. Electrical bond preparation for all aluminum-to-aluminum interfaces per SAE
ARP1870 section 5.1 and 5.5.
11. If a bonding strap will be used to reach the grounding location, secure the end of the
tape to the secondary composite surface as shown in Figure 4-51. Note that the
procedure for installing mounting bolts applies only to secondary aircraft structures, not
to primary structure or structural load-carrying members. The tape shall meet 5:1
length to width ratio if a bonding strap is used. The bonding strap shall be one inch
wide and no longer than five inches. Refer to Figure 4-51.
12. Terminate both ends of the bonding strap with MS20659-130 terminal lugs.
13. Install AN960C10 washer between the terminal lug and the mating metal surface and
secure with a #10 steel bolt. Ensure that the lug and washer are centered and in full
contact with the mating surface with no overhang when secured.
14. Secure the end of the tape in place using a 0.063" piece of aluminum using three bolts
and nuts. Refer to Figure 4-51.
15. Secure the aluminum tape to the GAD 29/29B or mounting rack as shown in Figure
4-52.
16. Verify that the resistance between tape and the local grounding location does not
exceed 2.5 mΩ.
Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual

Figure 4-50 Aluminum Tape Joint

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