Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the drive shaft
removed in accordance with the applicable technical manuals listed in Table 1 -1.
Access. Access is through the deck area doors, fairing, and walkway area (Figure 1-4, Items T250, T290, and
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
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 3-6.
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.
Marking and Recording of Inspection Results. Mark and record the inspection results as required by
Figure 3-6. Forward Hanger Bearing Flange