Table 3-1. Minimum Penetration Time For Penetrants

PENETRANT INSPECTIONS -cont - TM-1-1500-204-23-7_18

Minimum Penetration Time For Penetrants -cont - TM-1-1500-204-23-7_20

TM-1-1500-204-23-7 General Aircraft Maintenance (Nondestructive Testing and Flaw Detection Procedures and Practices) Volume 7 Manual
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TM 1-1500-204-23-7 Table 3-1. Minimum Penetration Time For Penetrants Water Post washable emulsified Type of penetration penetration Material Form discontinuity time (minutes) time (minutes)1 Aluminum Castings Porosity 5 to 15 5² Cold shuts 5 to 15 5² Extrusions and Laps N/R 10 forgings Welds Lack of fusion 30 5 Porosity 30 5 All Cracks 30 10 Fatigue cracks N/R 30 Magnesium Castings Porosity 15 5² Cold shuts 15 5² Extrusions and Laps N/R 10 forgings Welds Lack of fusion 30 10 Porosity 30 10 All Cracks 30 10 All Fatigue cracks N/R 30 See footnotes at the end of table. 3-6

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