Fig. 17 Broken-open lap 6x um Fig 18 Scanning electron micrograph of surface features in dark area. Fig. 19 Micrograph of lap. As polished 58x This case is particularly significant in that it is a successful example of failure prevention through periodic field inspections. The previously unknown defects were discovered only after magnetic particle inspection procedures adheringFig. 17 Broken-open lap. 6× Fig. 18 Scanning electron micrograph of surface features in dark area. Fig. 19 Micrograph of lap. As polished. 58× This case is particularly significant in that it is a successful example of failure prevention through periodic field inspections. The previously unknown defects were discovered only after magnetic particle inspection procedures adhering