TM 1-1520-265-23Change 3 2-152.8.3.5 NDI Equipment Settings.a. Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19eII.Frequency F1 - 1000 KHz F2 - offHdB - 57.0VdB - 69.0Rot - 30_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.)2.8.3.6 Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 2-8.a. Place probe on good area in the inspection location and null. Adjust phase as required toobtain 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 2.8.3.1 may be used depending primarily on theease of accessibility and user friendliness. If the probes are changed, steps 2.8.3.5b. (1), (2), and (3) shall be repeated each time a change is made.2.8.3.7 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.2.8.4 BackupMethod. None required.2.8.5 SystemSecuring. The antiflap bracket, if removed, requires installation in accordance withthe applicable technical manuals listed in Table 1-1.2.9 DROOP STOP SUPPORT RING NUT (ET).2.9.1 Description(Figure2-1,IndexNo.9). The droop stop support ring nut holds the droop stopsupport ring and outer sleeve assembly in place on the spindle.2.9.2 Defects. The inspection is used to verify crack indications found visually on the droop stopsupport ring nut. No cracks are allowed.
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