Bonding Jumper - Garmin GTX 335 w GPS Installation Guidance

3.15.2 Bonding Jumper

A bonding strap can be fabricated and installed to make sure the vibration-isolated instrument panel is
grounded to metallic structure.
The bonding strap length must not exceed six inches in length.
The bonding strap must not loop back on itself. The strap must not bend more than 45 degrees.
Refer to Bonding Jumper Installations in AC 43.13-1B Chapter 11 for guidance on attaching the
bonding strap to structure.
Install the bonding jumper with this procedure. Refer to figure 3-5 and table 3-14. Assemble a bonding
strap by securely attaching terminal lugs (item 2) to each end of the overbraid.
1. Select a location to minimize the presence of moisture and allow for easy inspection.
2. Make sure all surface preparation material (e.g., primer, paint, etc.) is removed between the large
diameter flat washer (item 6) under the terminal lug and metallic surface on the aircraft
(instrument panel and aircraft metallic structure or aircraft ground).
3. After assembly and bonding check, prime the airframe structure or instrument panel in accordance
with one of these:
• The approved aircraft maintenance manual
• MIL-PRF-85285 Type I, Color to suit (36081 Flat Gray Preferable) Coating:
Polyurethane, Aircraft and Support Equipment
• MIL-PRF-23377 Type I, Class N, Primer Coatings: Epoxy, High-Solids
4. Install one end of the bonding strap to the instrument panel and the other end to aircraft metallic
structure (or aircraft ground).
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GTX 335 w/GPS Installation Guidance
Page 3-18