TM 1-1520-264-23
4.13.3.6
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of
possible cracks. The position required for this inspection is illustrated in Figure 4-13.
a.
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 media momentarily before removing the current. Current should be applied for no more than five
seconds.
d.
Inspect for cracks using the black light.
4.13.3.7
Marking and Recording of Inspection Results. Mark and record the inspection results as required by
paragraph 1.3.
4.13.3.8
Demagnetization. With the switch remaining in the AC position, place the probe/yoke legs in the same
position used for magnetizing. Press the test switch and withdraw the probe/yoke from the part for a distance of two feet
before releasing the switch.
4.13.4
Backup Method. None required.
4.13.5
System Securing. Clean the rotor mixer support bolt thoroughly to remove all residual magnetic particle media.
Refer to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The rotor mixer support bolt
requires installation in accordance with the applicable technical manuals listed in Table 1-1.
Figure 4-13. Rotor Mixer Support Assembly Bolt
4-33
