TM 1-1520-265-234-70 Change 24.29.3.6 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.4.29.4 BackupMethod . None required.4.29.5 System Securing . Clean the parking brake valve components to remove inspection media.Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The parkingvalve requires assembly and installation in accordance with the applicable technical manuals listedin Table 1-1.4.30 SLAVE MIXER VALVE PARTS (PT).4.30.1 Description (Figure4-1, IndexNo.30) . The slave mixer valve isolates the pilot and copilotbrake line circuits from each other. This inspection pertains to the components contained within theslave mixer valve body.4.30.2 Defects . This inspection is used to verify crack indications found visually on the slave mixervalve components. No cracks are allowed.4.30.3 PrimaryMethod. Fluorescent Penetrant.4.30.3.1 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.4.30.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenanceand the slave mixer removed and disassembled in accordance with the applicable technicalmanuals listed in Table 1-1.4.30.3.3 Access. Not applicable.4.30.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.4.30.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to FluorescentPenetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 4-30.4.30.3.6 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.4.30.4 BackupMethod . None required.4.30.5 SystemSecuring. Clean the components to remove inspection media. Refer to PostCleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The slave mixer valverequires assembly and installation in accordance with the applicable technical manuals listed inTable 1-1.
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