| Specification | Process Description | Category | Limits |
| ASTM E1417 | Standard Practice for Liquid Penetrant Testing | Non-Destructive Testing | Limits: None |
| AWS D:17.1 | Fusion Welding for Aerospace Applications | Welding | Limits: Limits: GTAW / Tubing Seam Welds only |
| GP 17 G | Procedure, Etching prior to Penetrant Inspection | Chemical Processing | Limits: Limited to Swab Etching of Weldments only. |
| GT 23 A | Fluorescent Penetrant Inspection | Non-Destructive Testing | Limits: None |