Refer to Eddy Current Method, paragraph 1.4.11. Set up on test block as follows:
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. (See the standard instrument display shown in
Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 2-29.
Place probe on a good area in the inspection location and null. Adjust phase as required to obtain horizontal
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 the inspection results as required by
Backup Method. None required.
System Securing. The tail rotor clamps and locking plates, if removed, require installation in accordance with
the applicable technical manuals listed in Table 1-1.