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)
18.104.22.168 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. Partial inspection for
cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces of the
installed part using this procedure. If required, the engine mount cap shall be removed in accordance with the applicable
22.214.171.124 Access. Access is through the engine upper and lower doors from the engine work platform.
See Figure 1-4 - CH-47: 20, 21, and 22; MH-47: 18, 20, and 21.
126.96.36.199 Preparation of Part. The engine mount cap shall be thoroughly cleaned. Refer to Preparation of Part or Area
188.8.131.52 NDI Equipment Settings.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e .
- 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 1-7.)