What type of marking utensil is specifically used for marking fastener locations?

The approved non-graphite pencil is specifically used for marking fastener locations for several important reasons. Unlike graphite pencils, which can leave behind a residue that may contaminate sensitive surfaces or interfere with coatings and treatments, non-graphite pencils are designed to provide marks that are clean and removable. This is particularly important in aerospace applications where precision and cleanliness are critical in maintaining the integrity of components.

Non-graphite pencils often use materials that are less likely to introduce any foreign substances onto the parts being marked, which can be crucial when preparing surfaces for assembly or for subsequent painting and coating processes. Additionally, within the aerospace industry, there are strict regulations regarding the materials used in manufacturing and assembly processes to ensure safety and compliance with established standards. Thus, the use of an approved non-graphite pencil conforms to these standards, ensuring that all marking is done using materials that have been tested and deemed safe for use in high-performance environments.

This careful selection of marking tools is a fundamental part of maintaining quality assurance in aerospace assembly, reinforcing the importance of using the proper instruments for specific tasks.