U.S. Air Force Master Sgt. Dave Chinander, 173rd Maintenance Group, demonstrates for Maj. Gent. T. Glenn Davis how a fixture is mounted directly to the wing and used to successively remove fine layers of titanium from the wing’s skin exposing the wing spar beneath. Through the opening maintainers can use various inspection techniques such as an eddy current tester to determine if the spar is sound, however without this small opening it is not possible to conduct any meaningful inspection. (U.S. Air National Guard photo by Master Sgt. Jennifer Shirar\released)