T.O. 33B-1-14-594.5.7 ReferenceStandardsForCracks.NOTEThe AF general purpose eddy current standard, NSN 6635-01-092-5129, P/N7947479-10, SHALL be the common standard used to perform eddy currentinspections on aluminum components within the Air Force unless otherwisespecified by the cognizant weapon system engineering authority. See Figure 4-47through Figure 4-49. Figure 4-50 is the Navy version of this standard. The NavyEddy Current Reference Standard Kit, Part Number NRK-3AST, consists of (1)Aluminum, Part Number NRK-3A, 7075-T651 top & middle layer, 7075-T73bottom layer; (1) Steel, Part Number NRK-3S, 4340 alloy all three layers and (1)Titanium, Part Number 6AL4V alloy all three layers.Figure 4-47. Air Force General Purpose Eddy Current Standard.
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