TM 1-1520-265-23a.Select AC on the AC/DC power switch.b.Place probe/yoke on part in position 1 as shown.c.Press the test switch and apply a light coat of magnetic particle media at the same time. Remove the mediamomentarily before removing the current. Current should be applied for no more than five seconds.d.Inspect for cracks using the black light.e.Demagnetize before moving to the next position. Refer to paragraph 2.10.3.8.f.Repeat steps a. through e. for position 2.2.10.3.7Marking and Recording of Inspection Results . Mark and record inspection results as required byparagraph 1.3.2.10.3.8Demagnetization. With the switch remaining in the AC position, place the probe/yoke legs in the sameposition used for magnetizing. Press the test switch and withdraw the probe/yoke from the part for a distance of two feetbefore releasing the switch.2.10.4BackupMethod.None required.2.10.5SystemSecuring.Clean the balance weight bracket thoroughly to remove all residual magnetic particlemedia. Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The balance weightbracket, if removed, requires installation in accordance with the applicable technical manuals listed in Table 1-1.2.11 SPINDLE HORN (ET).2.11.1Description(Figure2-1.IndexNo.11).The spindle horn is attached to the main rotor spindle andtransmits pitch movement from the rotary swashplate, through the pitch control rod to rotate the spindle, and changes theblade angle.2.11.2Defects.Defects may occur anywhere on the surface of the spindle horn. All areas where rework has beenperformed shall be inspected for cracks. No cracks are allowed.2.11.3PrimaryMethod. Eddy Current.2.11.3.1NDI Equipment and Materials . (Refer to Appendix B.)a.Eddy Current Inspection Unitb.Probe, straight, shielded surface, 100 KHz-500 KHzc.Probe, right angle, shielded surface, 100 KHz-500 KHz, 90° 1/2 inch dropd.Cable Assemblye.Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)f.Teflon Tape, refer to Table 1-8g.Aircraft Marking Pencil, refer to Table 1-82-21
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