How do you determine where to mark the locations for the fasteners of the doubler?

Consulting the engineering drawing is essential for determining where to mark the locations for the fasteners of a doubler. Engineering drawings provide precise specifications, dimensions, and tolerances necessary for ensuring that components are accurately assembled. These drawings are created to meet structural integrity and operational requirements, enabling the assembly mechanic to ensure that fasteners are placed in specific locations that align with the design intent.

Using a measuring tape may provide measurement capability, but it wouldn't ensure the accuracy required for alignment with the engineering specifications outlined in the drawing. Following standard safety procedures is crucial for maintaining safety in the workplace but does not directly address the marking of fastener locations. Eye estimating the position could lead to inaccuracies, which can jeopardize the assembly’s performance and integrity. Therefore, relying on engineering drawings is the best and most accurate method for marking fastener locations.