TM 1-1520-265-23Change 2 6-436.21.4 BackupMethod. None required.6.21.5 SystemSecuring. Clean the aft bellcrank thoroughly to remove all residual magneticparticle media. Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16.The aft bellcrank, if removed, requires installation in accordance with the applicable technicalmanuals listed in Table 1-1.6.22 HYDRAULIC/PNEUMATIC SYSTEM COMPONENTS (PT).6.22.1 Description(Figure6-1,IndexNo.22). This inspection is applicable to all unpainted valves,fittings, and tubes contained within the hydraulic/pneumatic system. This inspection can also beused to verify any indications found on painted surfaces, providing the paint is only removed fromthe immediate area of interest.6.22.2 Defects.This inspection is used to verify crack indications found visually on thehydraulic/pneumatic system components. No cracks are allowed.6.22.3 PrimaryMethod. Fluorescent Penetrant.6.22.3.1 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.6.22.3.2 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, thehydraulic/pneumatic system components shall be removed in accordance with the applicabletechnical manuals listed in Table 1-1.6.22.3.3 Access. Accessibility to the hydraulic/pneumatic system components varies considerably.Refer to Figure 1-4 and Table 1-2 to locate applicable access provisions.WARNINGMaintenance Platforms/WorkstandsUse only appropriate platforms, workstands, or other approved locally procuredstands and restraint equipment when working above 10 feet on helicopters in anontactical environment. Otherwise, personnel injury could result from accidentalfalls.6.22.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.6.22.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to FluorescentPenetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 6-22.6.22.3.6 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.6.22.4 BackupMethod. None required.6.22.5 SystemSecuring.Clean the hydraulic/pneumatic system components to removeinspection media. Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph
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