18.104.22.168 NDI Equipment and Materials. (Refer to Appendix B.)
Magnetic Particle Inspection Probe/Yoke
Fluorescent Magnetic Particles, refer to Table 1-8
Consumable Materials, refer to Table 1-8
Aircraft Marking Pencil, refer to Table 1-8
Hand-held magnetic coil may be used. Refer to paragraph 22.214.171.124.2 and Figure 1-6.
126.96.36.199 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the engine nose
gearbox input quill shaft removed in accordance with the applicable technical manuals listed in Table 1-1.
188.8.131.52 Access. Not applicable.
184.108.40.206 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
220.127.116.11 NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
18.104.22.168 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 3-12.
Select AC on the AC/DC power switch.
Place probe/yoke on part in position 1 as shown.
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.
Inspect for cracks using the black light.
Figure 3-12. Engine Nose Gearbox Input Quill Shaft