18.104.22.168 Access. Access to the aft portions of F.S. 530, all stringers aft of F.S. 530, and both forward and aft portions of
F.S. 547 is by removal of covers R/L 545. Access to all stringers forward of F.S..530 and the forward portion of the F.S.
530 frame is by entry into the tailboom at L/R 330 and crawling aft.
22.214.171.124 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
126.96.36.199 NDI Equipment Settings.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19ell.
- 200 KHz
Probe drive - mid
Refer to Eddy Current Method, paragraph 1.4.11. Set up on test block as follows:
(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. (See the standard instrument display shown in Figure 1-7.)
188.8.131.52 Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 4-7.
Place probe on a good area in the inspection location and n
ull. Adjust phase as required to obtain horizontal lift-off.
Inspect the part.
Any signal similar to the notches in the test block is cause for rejection.
Either probe identified in paragraph 184.108.40.206 may be used depending primarily on the ease of accessibility and
user friendliness. If the probes are changed, steps 220.127.116.11 b.(1), (2), and (3) shall be repeated each time a
change is made.
18.104.22.168 Marking and Recording of Inspection Results. Mark and record the inspection results as required by paragraph
Backup Method. None required.
System Securing. Secure applicable access covers.