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AC 43.13-1B 9/8/98 blotter to assist the natural capillary action bleed-out of the penetrant from discontinuities and to spread the penetrant at discontinuity surface edges to enhance bleed-out indications. After the developer is applied, allow sufficient time for the penetrant to be drawn out of any discontinuities. Follow the manufacturer’s recommendations. j. Inspection for Discontinuities. After the penetrant has sufficiently developed, visu- ally inspect the surface for indications from discontinuities. Evaluate each indication ob- served to determine if it is within acceptable limits. Visible penetrant inspection is per- formed in normal visible white light, whereas fluorescent penetrant inspection is performed in black (ultraviolet) light. k. Post-Cleaning. Remove inspection material residues from parts after completion of penetrant inspection. This residue could interfere with subsequent part processing, or if left on some alloys, it could increase their sus- ceptibility to hydrogen embrittlement, inter- granular corrosion, and stress corrosion during service. 5-64. TECHNICAL STANDARDS. Two of the more generally accepted aerospace in- dustry standards are the MIL-I-25135E, In- spection Materials, Penetrants (see table 5-6) and ASTM-E-1417. The penetrant materials specification (MIL-I-25135E) is used to pro- cure penetrant materials and the process con- trol specification (MIL-STD-6866) is used to establish minimum requirements for conduct- ing a penetrant inspection. Table 5-6 provides a partial listing of commonly-accepted stan- dards and specifications for penetrant inspec- tion. Page 5-34 Par 5-63PDF Image | AFS-640
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