Boeing engineers suspect a presence of fatigue crack on the fuselage of Boeing 737 airplane but couldn't see it visually. The crack, even though it is too small to be seen by naked eyes, could lead to a catastrophic failure. Design an experiment to detect such cracks that are not visible. Present it as a written document.

The Experiment should contain the following:

Title: (Try to make it short if possible)

Objective

Approach

Instrumentation and set up

Procedure