TM 1-1520-265-23Change 2 5-35.2 DESWIRL DUCT VANES AND LOOP CLAMP (PT).5.2.1 Description(Figure5-1,IndexNo.2). The deswirl duct, containing the deswirl duct vaneis attached to the engine power turbine flange by a loop clamp.5.2.2 Defects. This inspection is used to verify crack indications found visually on the deswirl ductvanes and the loop clamp. No cracks are allowed.5.2.3 PrimaryMethod. Fluorescent Penetrant.5.2.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in Table1-7. AMS 2644 level 3 penetrant materials shall be selected from the approved list in Table 1-8.Parts requiring flourescent penetrant inspection shall be cleaned prior to inspection with n--PropylBromide (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) rinse or wipe:or drying until there is no visible solvent residue left on parts.5.2.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance andthe deswirl duct and loop clamp removed in accordance with the applicable technical manuals listedin Table 1-1.5.2.3.3 Access. Not applicable.5.2.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.5.2.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to FluorescentPenetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 5-2.5.2.3.6 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.5.2.4 BackupMethod. None required.5.2.5 SystemSecuring. Clean the duct vanes and loop clamp to remove inspection media. Referto Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The duct vanes andloop clamp require installation in accordance with the applicable technical manuals listed in Table1-1.5.3 ENGINE TUBING, COUPLINGS, AIR DUCTS, FITTINGS, SUPPORTS, BRACKETS, ANDCLIPS (PT).5.3.1 Description(Figure5-1,IndexNo.3). This task is for all metallic, unpainted engine tubing,couplings, air ducts, related fittings, supports, brackets, and bracket clips.5.3.2 Defects. This inspection is used to verify crack indications found visually. No cracks areallowed.5.3.3 PrimaryMethod. Fluorescent Penetrant.5.3.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in Table1-7.AMS 2644 level 3 penetrant materials shall be selected from the approved list in Table 1-8. Partsrequiring flourescent penetrant inspection shall be cleaned prior to inspection with n--PropylBromide (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) rinse or wipe:or drying until there is no visible solvent residue left on parts.
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