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The course consists of the basic and simpler methods of inspecting and nondestructive testing of parts and materials to insure the quality and reliability of the finished product. The outline consists of six blocks totaling 135 hours: (1) defects in the metal ingot, (2) defects resulting from processing metals, (3) defects in metals in service, (4) visual inspection, (5) hardness testing, (6) liquid penetrant test and a posttest. Adequate laboratory time, experience on aircraft and other equipment, proficiency in the nature and application of techniques, and drill in the usage of testing equipment are necessary elements in skill development. A bibliography listing basic and supplementary references and a sample posttest conclude the document. (MW)

The course consists of the basic and simpler methods of inspecting and nondestructive testing of parts and materials to insure the quality and reliability of the finished product. The outline consists of six blocks totaling 135 hours: (1) defects in the metal ingot, (2) defects resulting from processing metals, (3) defects in metals in service, (4) visual inspection, (5) hardness testing, (6) liquid penetrant test and a posttest. Adequate laboratory time, experience on aircraft and other equipment, proficiency in the nature and application of techniques, and drill in the usage of testing equipment are necessary elements in skill development. A bibliography listing basic and supplementary references and a sample posttest conclude the document. (MW)

Journal of Research of the National Bureau of Standards

Manuals provide quality control and test personnel with basic information on liquid penetrant testing. Topics covered include scope of application, equipment and materials used, test procedures, safety precautions, quality control, and comparison of liquid penetrant testing with other nondestructive testing processes.

A review of the published literature on the reliability of liquid penetrant testing (LPT) identified twelve major probability of detection (POD) studies conducted between 1968 and 2009. Based on these studies, significant variability in performance is inferred between different implementations of the post-emulsifiable LPT process. This report presents statistical inferences for the defect size expected to be detected with 90% POD by most implementations of post-emulsifiable LPT, based on the published data. The reliably-detectable defect size of aNDI = 3 mm currently specified for the Royal Australian Air Force general procedure for post-emulsifiable LPT is consistent with estimates of the average performance of LPT demonstrated in the literature.