TAIL ROTOR DRIVE SHAFT COUPLING (PT)

Figure 3-6. Tail Rotor Drive Shaft Coupling

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 Change 2 3-13 NOTE Either probe identified in paragraph 3.5.3.1 may be used depending primarily on the ease 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 as required by paragraph 1.3. 3.5.4 Backup Method. None required. 3.5.5 System Securing. The tail rotor drive shaft supports, if removed, require installation in accordance wit the applicable technical manuals listed in Table 1-1. 3.6 TAIL ROTOR DRIVE SHAFT COUPLING (PT). 3.6.1 Description (Figure 3-1, Index No. 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 drive shaft components. Also, the couplings allow the drive shaft to remain in alignment as the airframe flexes in flight. 3.6.2 Defects. This inspection is used to verify crack indications found visually on the tail rotor drive shaft coupling. No cracks are allowed. 3.6.3 Primary Method. Fluorescent Penetrant. 3.6.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in Table 1-7. 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--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) 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.) may be performed on all exposed surfaces of the installed part using this procedure. If required, the tail rotor drive shaft coupling shall be removed in accordance with the applicable technical manuals listed in Table 1-1. 3.6.3.3 Access. Not applicable. WARNING Maintenance Platforms/Workstands Use only appropriate platforms, workstands, or other approved locally procured stands and restraint equipment when working above 10 feet on helicopters in a nontactical environment. Otherwise, personnel injury could result from accidental falls. 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 Fluorescent Penetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 3-6.

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