As an AS9120-A–certified supplier of aircraft components to the Defense Logistics Agency (DLA), the Department of Defense (DoD), and aerospace contractors, we often encounter situations where we need to understand the meaning of 121 Trace and 129 Trace (trace is referring to traceability paperwork for a component). Often times, the parts we supply are obsolete or very difficult to find. Secure Component’s role in our customer’s supply chain is to provide items they are unable to locate within their “authorized supply chain.” In short, we provide additional sourcing horsepower for their supply chain, which ensures that all the available options for parts that meet the acceptable quality, pricing, and timeline requirements for their application have been explored and are included in the quote. In some of our company’s recent interactions with clients, we have noticed confusion regarding 121 and 129 Trace. This post will explain both types of trace and clarify the confusion surrounding the two.