TM 1-1520-265-234.17.5 SystemSecuring. Clean the inspected part to remove inspection media. Refer to Post Cleaning and Restorationof Part or Area After NDI, paragraph 1.4.16. The tail pylon requires installation in accordance with the applicabletechnical manuals listed in Table 1-1.4.18 TAIL PYLON LOWER STEP (ET).4.18.1. Description(Figure4-1.IndexNo.18). The step mounted in the tail pylon and is the first step in accessing theupper pylon/tail rotor area.4.18.2. Defects. This inspection is used to verify crack indications found visually on the lower step and tube. No cracksare allowed.4.18.3. PrimaryMethod. Eddy Current.4.18.3.1. 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 1-84.18.3.2. 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 lower step shall be removed in accordance with the applicabletechnical manuals listed in Table 1-1.4.18.3.3. Access. Not applicable.4.18.3.4. Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.4.18.3.5. NDI Equipment Settings.a.Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19eII.Frequency F1- 200 KHzF2- offHdB- 57.0VdB- 69.0Rot- 56°Probe drive- midLPF- 100HPF- 0H Pos-80%V Pos- 20%4-43
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