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. A partial inspection
for cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces of
the installed part using applicable positions of this procedure. If required, the walking beam shall be removed in
accordance with the applicable technical manuals listed in Table 1-1.
188.8.131.52 Access. The walking beam is accessible on aircraft. Inspection of the pivot bushing requires removal and
disassembly of the walking beam. Inspection of the walking beam lug areas requires removal of the walking beam from
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. Positions required for this inspection are illustrated in Figure 6-18.
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.
Demagnetize before moving to the next position. Refer to paragraph 22.214.171.124.
Repeat steps a. through e. for positions 2, 3, and 4.
126.96.36.199 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3.
188.8.131.52 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.