TM 1-1520-265-23WARNINGMaintenance 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.6.9.3.4Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.6.9.3.5NDI Equipment Settings.a.Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e".Frequency F1- 200 KHzF2- offHdB- 57.0VdB- 69.0Rot- 56°Probe drive- midLPF- 100HPF- 0H Pos- 80%V Pos- 20%ob.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.)6.9.3.6Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 6-9.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 6.9.3.1 may be used depending primarily on the ease ofaccessibility and user friendliness. If the probes are changed, steps 6.9.3.5 b. (1), (2), and (3)shall be repeated each time a change is made.6-17
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