TM 1-1520-265-233-14 Change 3Figure 3-6. Tail Rotor Drive Shaft Coupling3.6.3.6 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.3.6.4 BackupMethod. None required.3.6.5 SystemSecuring. Clean the tail rotor drive shaft coupling to remove inspection media.Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The tail rotordrive shaft coupling, if removed, requires installation in accordance with the applicable technicalmanuals listed in Table 1-1.3.7 OIL COOLER DRIVE SHAFT (ET).3.7.1 Description(Figure3-1,IndexNo.7). The oil cooler drive shaft is aft of, and driven by, theshouldered shaft of the fan. The fan forces air through the radiator, which cools the hot oil from themain module sump. The forward flange of the oil cooler drive shaft is steel, the aft end is titanium,and the drive shaft tube is aluminum.3.7.2 Defects. This inspection is used to verify crack indications found visually on the aluminumand titanium portions of the oil cooler drive shaft. No cracks are allowed.3.7.3 PrimaryMethod. Eddy Current.3.7.3.1 NDI Equipment and Materials. (Refer to Appendix B.)a. Eddy Current Inspection Unitb. Probe, straight, shielded surface, 2 MHz (Titanium)c. Probe, right angle, shielded surface, 100 KHz-500 KHz, 90_ 1/2 inch drop (Titanium)d. Probe Adaptere. Cable Assemblyf. Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)g. Reference Block, three-notched titanium (0.008, 0.020, 0.040 EDM notches)h. Teflon Tape, refer to Table 1-8i. Aircraft Marking Pencil, refer to Table 1-8
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