Which fasteners are commonly subject to hardware safetying?

The choice indicating that bolts, nuts, and turnbuckles are commonly subject to hardware safetying is accurate because safetying is a process used to prevent the loosening of fasteners due to vibration, thermal cycles, and operational forces.

Bolts and nuts are the primary fasteners that require attention to ensure they remain securely in place. Safetying methods may include the use of lockwashers, cotter pins, safety wire, or other locking mechanisms designed specifically for those components to maintain structural integrity and safety in aviation applications.

Turnbuckles, which are often used in tension applications like rigging and control systems, also require hardware safetying to prevent inadvertent adjustments or disconnections that could lead to operational failures.

While some fasteners might not need the same levels of safety measures as bolts, nuts, and turnbuckles, it is essential to acknowledge that these three types are particularly vulnerable to loosening and often have specific guidelines in aviation standards to ensure reliability and safety. Therefore, the selection that includes these components best captures the fasteners commonly subject to safetying practices in the aviation field.