TM 1-1520-265-233.5 TAIL ROTOR DRIVE SHAFT SUPPORTS (ET).3.5.1 Description(Figure3-1.IndexNo.5). The tail rotor drive shaft support attaches the tail rotor drive shafts to theairframe throughout the tail cone section of the helicopter.3.5.2 Defects. This inspection is used to verify crack indications found visually on the tail rotor drive shaft supports. Nocracks are allowed.3.5.3 PrimaryMethod. Eddy Current.3.5.3.1 NDI Equipment and Materials. (Refer to Appendix B.)a.Eddy Current Inspection Unitb.Probe, straight, shielded surface, 100 KHz-500 KHzc.Probe, right angle, shielded surface, 100 KHz-500 KHz, 90° 1/2 inch dropd.Cable Assemblye.Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)f.Teflon Tape, refer to Table 1-8g.Aircraft Marking Pencil, refer to Table 1-83.5.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. A partial inspectionfor cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces ofthe installed part using this procedure. If required, the drive shaft shall be removed in accordance with the applicabletechnical manuals listed in Table 1-1.3.5.3.3 Access. Access to the tail rotor drive shaft supports varies considerably. Refer to Figure 1-4 and Table 1-2 tolocate applicable access provisions.WARNINGMaintenance Platforms/WorkstandsUse only appropriate platforms, workstands, or other approved locally procured stands andrestraint equipment when working above 10 feet on helicopters in a nontactical environment.Otherwise, personnel injury could result from accidental falls.3.5.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.3.5.3.5 NDI Equipment Settings.a.Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e”.Frequency F1- 200 KHzF2- offHdB- 57.0VdB- 69.03-11
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