What is the purpose of safety wire in aircraft maintenance?

Safety wire is an essential component of aircraft maintenance aimed specifically at securing fasteners and preventing them from loosening due to vibration. Aircraft are subjected to various forces during operation, including turbulence and engine vibrations, which can cause fasteners such as bolts and nuts to loosen over time.

By employing safety wire, technicians create a physical barrier that keeps fasteners tight and in place, significantly reducing the risk of mechanical failure that can lead to unsafe conditions. The wire is wrapped around the fastener and typically twisted to hold it securely; if the fastener begins to loosen, the wire will not allow it to turn freely, thus maintaining the integrity of the assembly.

This practice is critical for ensuring the safety and reliability of aircraft components, as the consequences of a loose fastener could be catastrophic. The other options do not correctly reflect the primary function of safety wire in aircraft maintenance.