2.8.3.5 NDI Equipment Settings

TM 1-1520-265-23 Change 3 2-15 2.8.3.5 NDI Equipment Settings. a. Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e^II. Frequency F1 - 1000 KHz F2 - off HdB - 57.0 VdB - 69.0 Rot - 30_ Probe drive - mid LPF - 100 HPF - 0 H 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 when probe is passed over 0.040-inch notch in test block. (See the standard instrument 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 to obtain horizontal lift-off. b. Inspect the part. c. Any signal similar to the notches in the test block are cause for rejection. NOTE Either probe identified in paragraph 2.8.3.1 may be used depending primarily on the ease of accessibility and user friendliness. If the probes are changed, steps 2.8.3.5 b. (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 as required by paragraph 1.3. 2.8.4 Backup Method. None required. 2.8.5 System Securing. The antiflap bracket, if removed, requires installation in accordance with the applicable technical manuals listed in Table 1-1. 2.9 DROOP STOP SUPPORT RING NUT (ET). 2.9.1 Description (Figure 2-1, Index No. 9). The droop stop support ring nut holds the droop stop support 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 stop support ring nut. No cracks are allowed.