TM 1-1520-265-23Change 2 5-215.12 EXHAUST FAIRINGS (PT).5.12.1 Description(Figure5-1,IndexNo.12). The upper and lower fairings are the portions of theexhaust module that contain the exhaust ejector.5.12.2 Defects. Defects can occur anywhere on the surface of the exhaust fairings. No cracks areallowed. Repeat this inspection after repairs.5.12.3 PrimaryMethod. Fluorescent Penetrant.5.12.3.1 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.5.12.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenanceand the exhaust module removed in accordance with the applicable technical manuals listed in Table1-1.5.12.3.3 Access. Not applicable.5.12.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.5.12.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to FluorescentPenetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 5-12.5.12.3.6 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.5.12.4 BackupMethod. None required.5.12.5 SystemSecuring. Clean the exhaust fairing to remove inspection media. Refer to PostCleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The exhaust module requiresinstallation in accordance with the applicable technical manuals listed in Table 1-1.Figure 5-12. Exhaust Fairings
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