Non destructive testing (NDT) is undoubtedly a very popular material and equipment testing technique. There are several NDT methods, the most common generally is the magnetic particle inspection (MPI inspection) method or magnaflux inspection. NDT is generally used in the aerospace area.

Product companies as well as the FAA (Federal Aviation Administration) usually specify the NDT process to be used in inspection and the method to be used. The NDT specifications are specified in the maintenance, inspection, or rebuild manual of the producer. The FAA AD or alternatively Airworthiness Directives, SSID or simply Supplemental Structural Inspection Documents, and SB or manufacturer's service announcements also indicate the non destructive testing tools and procedures to be applied. There are, however, some conditions where alternative NDT procedures and procedures can be used, a good example being in Title fourteen of the Code of Federal Regulations (14 CFR) part 145.

The most popular use of non destructive testing equipment including magnaflux equipment in the aerospace industry is for flaw diagnosis and processes. The right approach should be used as improver evaluation or mistake could lead to the rejection of serviceable parts. The imperfections that are detected using NDT methods for example MPI inspection are erosion detection, which is the electrochemical deterioration of materials that comes from chemical reaction with climatic factors, inherent defects, which are flaws that are present in metals because of their initial solidification, surface flaws such as joints, incomplete weld influx and fusion, weld undercutting, cracks in the weld metal as well as the weld heat-affected space, cooling cracks, shrinkage cracks, forging laps, chippings, laminations in rolled plates and sheets, hot rips, cupping, cold shut, slag inclusion, and scale, that is an oxide that is generated on metal. Non destructive testing equipment such as magnaflux equipment is as well used for other flaws for example secondary processing/finishing defects like machining tears, grinding cracks, heat treating cracks, and etching cracks, in-service flaws such as stress rust crack, overstress cracks, fatigue cracks, as well as unbonds/disbonds defects.

NDT methods such as MPI inspection are important given that it is important to know where defects occur in aircraft machines as failure could lead to tragedy. The use of non destructive testing equipment like magnaflux equipment saves airlines billions of dollars as it means materials as well as equipment do not have to be destroyed for testing. NDT equipment for instance for MPI inspection do not include moving parts and they thus do not suffer from rip and wear. NDT methods produce quick results and are extremely effective.

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