TM 1-1520-265-232-26 Change 32.13.3.1 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, 2 MHz, 90_ 1/2 inch drop (Titanium)d. Adapter, Probee. 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 1-82.13.3.2 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, thedamper assembly shall be removed in accordance with the applicable technical manuals listed inTable 1-1.2.13.3.3 Access. Access to the damper assembly is from the L/R engine cowl (Figure 1-4, Items3T-7 and 4T-8).2.13.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to preparation of Part orArea for NDI, paragraph 1.4.4.2.12.3.5 NDI Equipment Settings.a. Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19eII.Frequency F1 - 200 KHz (Aluminum) 1500 KHz (Titanium)Frequency F2 - offHdB - 57.0VdB - 69.0Rot - (56_ Aluminum and Titanium)Probe drive - midLPF - 100HPF - 0H Pos - 80%V Pos - 20%b. Refer to Eddy Current Method, paragraph 1.4.11. Set up on test block as follows:(1) .Null probe on test block.(2) .Adjust phase as required to obtain horizontal lift-off.(3) .Move probe over all three notches in test block. Adjust gain to obtain a three block verticalsignal when probe is passed over 0.040-inch notch in test block. (See the standardinstrument display shown in Figure 1-7.)
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