ND1 Equipment Settings.
a. Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19elI.
- 200 KHz
(1) Null probe on test block.
(2) Adjust phase as required to obtain horizontal lift-off.
(3) 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-
a. Place probe in the inspection location and null. Adjust phase as required to obtain horizontal lift-off.
b. Inspect the part.
Any signal similar to the notches in the test block is cause for rejection.
Either probe identified in paragraph 220.127.116.11 may be used depending primarily on the ease of
accessibility and user friendliness. If the probes are changed, steps 18.104.22.168 b. (1), (2), and (3)
shall be repeated each time a change is made.
Marking and Recording of Inspection Results. Mark and record as required by paragraph 1.3.
4.10.4 Backup Method. None required.
4.10.5 System Securing. If removed, assemble and install the rescue hatch lower door gearbox housing and cover in
accordance with the applicable technical manuals listed in Table 1-1.