If a gap inspection shim can slide under the manufactured head and touch the rivet shank, how is that condition rated?

In the context of aerospace assembly mechanics, the performance and integrity of riveted joints are critical for structural safety and longevity. A gap inspection shim is used to evaluate the quality of the rivet's installation by checking the space between the manufactured head of the rivet and the surface of the material being joined.

If a gap inspection shim can slide under the manufactured head and make contact with the rivet shank, this signifies that there is an improper fit or insufficient mechanical contact between the rivet head and the surface of the material. This can lead to inadequate load transfer, potential structural failure, or a compromised seal, which is crucial in aerospace applications.

Therefore, this condition is rated as not acceptable. Proper installation requires that the rivet head be firmly seated against the material without gaps, ensuring the integrity of the connection and contributing to the overall strength of the assembly. This standard is essential to maintain safety and structural performance in aerospace designs.