Which of the following is NOT an example of a protective device/FOD barrier?

The concept of Foreign Object Debris (FOD) management is critical in maintaining safety and operational integrity within aviation and similar industries. Protective devices or FOD barriers are specifically intended to prevent debris from entering sensitive areas where it could cause damage or contamination.

Edge protectors serve to shield parts during handling or storage by creating a physical barrier against potential FOD. Similarly, plugs are used to seal open ends of pipes or connectors, preventing debris from entering those openings. Filters also play a crucial role by removing particulate matter from fluids or air, effectively preventing potential contaminants from causing operational issues.

Fasteners, however, are primarily used for securing components together rather than acting as barriers against foreign objects. While they are essential for the assembly and integrity of structures, they do not function in the capacity of protecting against FOD. Therefore, they do not meet the criteria for being classified as a protective device or FOD barrier.