What is a bond strap and where is it used?

• A. A conductive strap used to connect components to equalize potentials and provide a path to ground.
• B. A strap to secure the wiring harness to the airframe.
• C. A strap to attach the battery to the engine.
• D. A strap to fasten avionics modules to the panel.

Answer: (A)

Bonding is the practice of tying conductive parts together with a low-impedance connection so they share the same electrical potential. A bond strap is a short, flexible conductor (typically copper) used to connect different metal components or sections of the airframe to keep them at equal potential and to provide a path for fault currents or static discharge to flow to ground. This keeps potentials balanced, reduces the chance of arcing at joints, minimizes galvanic corrosion, and helps prevent EMI issues that could affect avionics and other systems. It’s not primarily for securing wiring or mounting gear—that’s handled by mechanical straps or tie-downs—whereas a bond strap’s purpose is electrical bonding between parts.