2.13.3 Primary Method. Eddy Current.
18.104.22.168 NDI Equipment and Materials. (Refer to Appendix B.)
Eddy Current Inspection Unit
Probe, straight, shielded surface, 100 KHz-500 KHz
Probe, right angle, shielded surface, 100 KHz-500 KHz, 901/2 inch drop
Reference Block, three-notched aluminum (0.008, 0.020, and 0.040 EDM notches)
22.214.171.124 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the ball spherical
bearing shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
126.96.36.199 Access. Not applicable.
188.8.131.52 Preparation of Part. The ball spherical bearing shall be thoroughly cleaned. Refer to Preparation of Part or
184.108.40.206 NDI Equipment Settings.
a. Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e .
- 200 KHz
Null probe on test block.
Adjust phase as required to obtain horizontal lift-off.
Move probe over all three notches in test block. Adjust gain to obtain a three block vertical signal when
probe is passed over 0.040 inch notch in test block. (Refer to standard instrument display shown in Figure