What is the purpose of safety wire in aircraft maintenance?

The purpose of safety wire in aircraft maintenance is to prevent fasteners from loosening due to vibration. In aviation, fasteners such as nuts, bolts, and screws are subject to various forces and vibrations during the operation of the aircraft. Over time, these vibrations can cause fasteners to become loose, potentially leading to critical failures if vital components were to detach.

Safety wire is a mechanical solution that involves threading a wire through a fastener's hole and twisting it to create tension. This tension ensures that even if the fastener begins to turn loose, the wire will not allow it to completely disengage. It acts as a mechanical locking device that provides an extra layer of security, enhancing the overall safety and reliability of the aircraft's systems.

Improving aerodynamic efficiency, enhancing visual appearance, and providing electrical insulation are not functions served by safety wire. While these factors may have their own importance in aircraft design and maintenance, they do not pertain to the specific mechanical purpose of safety wire in preventing fastener loosening.