TM 1-1520-265-235.6.3PrimaryMethod. Magnetic Particle.5.6.3.1NDI Equipment and Materials. (Refer to Appendix B.)a.Magnetic Particle Inspection Probe/Yokeb.Magnetometerc.Black Lightd.Fluorescent Magnetic Particles, refer to Table 1-8e.Consumable Materials, refer to Table 1-8f.Aircraft Marking Pencil, refer to Table 1-8NOTEHand-held magnetic coil may be used. Refer to paragraph 1.4.8.1.2 and Figure 1-6.5.6.3.2Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the engineremoved in accordance with the applicable technical manuals listed in Table 1-1.5.6.3.3Access. Not applicable.5.6.3.4Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.5.6.3.5NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.5.6.3.6Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation ofpossible cracks. Positions required for this inspection are illustrated in Figure 5-6.a.Select AC on the AC/DC power switch.b.Place probe/yoke on part in position 1 as shown for each fitting.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 5.6.3.8.f.Repeat steps a. through e. for position 2 on each fitting.5.6.3.7Marking and Recording of Inspection Results. Mark and record inspection results as required byparagraph 1.3.5.6.3.8Demagnetization. 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.5.6.4Backup Method. Fluorescent Penetrant, refer to paragraph 1.4.7.5.6.5System Securing. Clean the fittings thoroughly to remove all residual magnetic particle media. Refer toPost Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The engine requires installation inaccordance with the applicable technical manuals listed in Table 1-1.5-11
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