A smoking rivet is an indication of what issue?

A smoking rivet indicates an issue related to fretting or movement. When rivets are subjected to vibration or movement, they can wear against the surrounding material, causing microscopic wear and friction. This friction generates heat, which can result in the rivet becoming excessively hot, potentially leading to a situation where smoke is produced.

This phenomenon often suggests that there is a loss of stiffness or integrity in the joint due to movement. It can serve as a warning sign that the structural integrity of the aircraft component may be compromised and requires urgent inspection and possible repair.

While excessive heat damage, corrosion damage, or improper installation can also lead to problems in riveted joints, the specific indicator of a smoking rivet most strongly points to the presence of movement or fretting. Thus, recognizing this sign is crucial for maintaining aircraft safety and performance.