Is a permanent fastener one that cannot be removed after installation without destroying it?

A permanent fastener is indeed defined as one that cannot be removed after installation without causing damage to the fastener itself or the components being fastened. This characteristic is crucial in many aerospace applications, where the integrity and reliability of fastened joints must be ensured under various operating conditions.

Permanent fasteners include items such as rivets, which are commonly used in aircraft assembly. Once a rivet is installed, it is deformed in such a way that removal would either destroy the rivet or compromise the structural integrity of the materials it joins. This permanence is by design, providing a reliable connection that is vital for safety and performance in aerospace structures.

In contrast, non-permanent fasteners, like screws or bolts, can be installed and removed without damaging the fastener or the materials, allowing for maintenance, repairs, or adjustments. Understanding the distinction between permanent and non-permanent fasteners is essential for aerospace mechanics, as it informs decisions on assembly methods and future serviceability of the aircraft components.