Which component should be attached to the assembly jig first when creating the assembly?

When assembling aircraft components, the stringer is typically the first component to be attached to the assembly jig. This is because the stringer serves as a structural reinforcement, providing support and maintaining the shape of the assembly. The stringer plays a crucial role in the overall integrity of the structure, ensuring that it can withstand aerodynamic forces and other loads during operation.

By attaching the stringer first, you create a framework upon which other components, such as the skin, filler, and doubler, can be accurately aligned and secured. This step is vital for maintaining proper geometry and load distribution throughout the assembly process. Additionally, stringers are usually attached in a way that facilitates the installation of the skin and other components, allowing for an organized and systematic assembly workflow.