TM 1-1520-265-23Change 2 3-13NOTEEither probe identified in paragraph 3.5.3.1 may be used depending primarily on theease of accessibility and user friendliness. If the probes are changed, steps 3.5.3.5b.(1), (2), and (3) shall be repeated each time a change is made.3.5.3.7 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.3.5.4 BackupMethod. None required.3.5.5 SystemSecuring. The tail rotor drive shaft supports, if removed, require installation inaccordance wit the applicable technical manuals listed in Table 1-1.3.6 TAIL ROTOR DRIVE SHAFT COUPLING (PT).3.6.1 Description(Figure3-1,IndexNo.6). The tail rotor drive shaft couplings are multiple disc,flexible couplings which are used to carry torque and allow for minor misalignment of the tail driveshaft components. Also, the couplings allow the drive shaft to remain in alignment as the airframeflexes in flight.3.6.2 Defects. This inspection is used to verify crack indications found visually on the tail rotordrive shaft coupling. No cracks are allowed.3.6.3 PrimaryMethod. Fluorescent Penetrant.3.6.3.1 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.3.6.3.2 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 tailrotor drive shaft coupling shall be removed in accordance with the applicable technical manualslisted in Table 1-1.3.6.3.3 Access. Not applicable.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.3.6.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.3.6.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to FluorescentPenetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 3-6.
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