Which two styles of wiring are commonly used for safetying?

The correct choice identifies double twist and single wire as two commonly used styles for safetying in aviation maintenance.

Safetying is a critical practice to ensure that fasteners, such as bolts and nuts, do not unintentionally loosen during flight operations. The double twist method involves creating a twist with two strands of wire that are wrapped around each other, providing increased security and resistance to vibration. This method is preferred for its ability to withstand higher loads and vibrations encountered during flight.

On the other hand, the single wire method is often used for lighter applications and involves simply twisting one strand of wire around a fastener. While this may not provide the same level of security as the double twist, it is still effective in certain environments and scenarios where maximum security isn't paramount.

By understanding these methods, aviation mechanics can effectively secure components, ensuring safety and reliability in aircraft operations.