TM 1-1520-265-236.7.3.4Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.6.7.3.5NDI Equipment Settings.a.Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e".Frequency F1- 200 KHzF2- offHdB- 57.0VdB- 69.0Rot- 56°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 vertical signal whenprobe is passed over 0.040-inch notch in test block. (See the standard instrument display shown in Figure1-7.) a.Place probe on a good area in the inspection location and null. Adjust phase as required to obtain horizontal lift-off.b.Inspect the part.c.Any signal similar to the notches in the test block are cause for rejection.NOTEEither probe identified in paragraph 6.7.3.1 may be used depending primarily on the ease ofaccessibility and user friendliness. If the probes are changed, steps 6.7.3.5 b. (1), (2), and (3)shall be repeated each time a change is made.6.7.3.7Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3.6.7.4 BackupMethod.Fluorescent Penetrant, refer to paragraph 1.4.7.6.7.5 SystemSecuring.The pilot/copilot cyclic and collective stick socket, if removed, requires installation inaccordance with the applicable technical manuals listed in Table 1-1.6-136.7.3.6 Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 6-7.
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