T.O. 33B-1-15-51e. Note that in the above example, the metal travel distances to the back surface of the reference standardand the test part were not equal. By using the DAC curve in establishing the transfer, this differencewas corrected.5.3.5.3.2 AngleBeamInspectionforASkinCrack.Use a reference standard configuration as shown in Figure 5-56. Reference standard should be same thickness andmaterial as skin to be examined. Specify size of saw cut. The inspection is set up using the saw cut to establish thesensitivity. Any discontinuity having a signal exceeding 25% of the saw cut signal is cause for rejection. Transfer isestablished as follows:Figure 5-56.Reference Standard for Inspection for Cracks in Skin.a. Place the search unit on the reference standard as shown in Figure 5-57 and position to obtain amaximum signal from the top corner of the wall of the fastener hole. Adjust the gain to bring the signalto 50% of saturation.Figure 5-57.Positioning Search Unit for Establishing Transfer.b. Place the search unit on the skin, and maximize the signal from the same size fastener hole as in thestandard by adjusting the position of the search unit. Do not change the gain setting used for thefastener hole in the standard.
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