What is the primary purpose of bonding wires in powerplant installations?

The primary purpose of bonding wires in powerplant installations is to provide a current return path. Bonding wires are used to ensure that all components of the electrical system are electrically connected to the aircraft’s ground reference. This connection helps to prevent the build-up of static electricity, which can pose a hazard and lead to potential electrical interference with the aircraft’s systems. By providing a reliable return path for electrical current, bonding wires help maintain the safety and integrity of the electrical systems within the powerplant.

The other options, while they might relate to engine or operational factors, do not directly relate to the specific function of bonding wires. Enhancing engine performance, increasing fuel efficiency, and reducing engine weight involve different aspects of engine design and operation, rather than the specific role of bonding wires in electrical safety and functionality.