Which of the following is NOT a type of self-plugging mechanical lock rivet?

Self-plugging mechanical lock rivets are designed to provide a reliable and robust fastening solution in various structural applications, particularly in aircraft assembly. Each of the listed types serves specific purposes and possesses unique characteristics that affirm their classification as self-plugging mechanical lock rivets.

CherryMAX rivets and CherryLOCK rivets, for instance, are widely known for their ability to create a secure lock within the material they are fastened to, requiring minimal installer effort and ensuring consistent performance under mechanical loads. Olympic-LOC rivets similarly utilize a self-plugging mechanism, establishing a strong bond without extensive access to the back side of the joint.

On the other hand, StandardLOCK is not recognized within the industry as a type of self-plugging mechanical lock rivet. It doesn't conform to the established naming conventions and classifications that define self-plugging rivets, making it the outlier among the options provided. This distinction allows for the identification of StandardLOCK as the answer, as it does not belong to the category of self-plugging mechanical lock rivets like the others do. Understanding these differences helps clarify the types of rivets used in aircraft maintenance and assembly, providing practical knowledge for both theoretical and hands-on assessments in the field.