TM 1-1520-265-235-36 Change 25.22.2 Defects. This inspection is to verify cracks found by visual inspection and to ensure nocracks are present after repairs.5.22.3 PrimaryMethod. Fluorescent Penetrant.5.22.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed inTable 1-7. AMS 2644 level 3 penetrant materials shall be selected from the approved list in Table1-8. Parts requiring flourescent penetrant inspection shall be cleaned prior to inspection withn--Propyl Bromide (vapor degreasing only)(Table 1--8), DS--108 (Table 1--8), Electron (Table 1--8),Positron (Table 1--8). DS--108, Electron, Positron must be followed by an acetone (Table 1--8) rinseor wipe: or drying until there is no visible solvent residue left on parts.5.22.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance.A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) maybe performed on all exposed surfaces of the installed part using this procedure. If required, the engineshall be removed in accordance with the applicable technical manuals listed in Table 1-1.5.22.3.3 Access. Access is through engine cowl (Figure 1-4, items 3T-7 or 4T-8).5.22.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.5.22.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to FluorescentPenetrant Method, paragraph 1.4.7. and Table 1-5. Inspect area of concern. See Figure 5-22.5.22.3.6 Marking and Recording of Inspection Results. Mark and record the inspection results asrequired by paragraph 1.3.5.22.4 BackupMethod. None required.5.22.5 SystemSecuring. Clean the inspected area to remove inspection media. Refer to PostCleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The engine, if removed,requires installation in accordance with the applicable technical manuals listed in Table 1-1.Figure 5-22. Engine Components
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