TM 1-1520-265-23
Change 4
5-22.1/(5-22.2 blank)
5.13.3.6 Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 5-4.
a. Place probe on a good area in the inspection location and null. Adjust phase as required to
obtain horizontal lift-off.
b. Inspect the part.
c. Any signal similar to the notches in the test block are cause for rejection.
NOTE
Either probe identified in paragraph 5.4.3.1 may be used depending primarily on the
ease of accessibility and user friendliness. If the probes are changed, steps 5.4.3.5b.
(1), (2), and (3) shall be repeated each time a change is made.
5.13.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
5.13.4 Backup Method. None required.
5.13.5 System Securing. Not applicable.
5.14 SUPPRESSOR CORE AND BAFFLE (PT).
5.14.1 Description (Figure 5-1, Index No. 14). The HIRSS kit contains a three-stage core and inner
baffle which reduces exhaust gas radiation and prevents line-of-sight viewing of hot engine surfaces.
Areas included in this procedure are within two inches of mounts or stage-to-stage attachments,
within two inches of bulkhead where it attaches to support flange on core., finger seal inlet holes,
stage 1 inner duct assembly, stage 1 outer duct assembly, stage 2 duct, second/third stage wiggle
strips, stage 3 duct, baffle guide slot, end plates, splitter plates and support brackets, and baffles.
5.14.2 Defects. Defects can occur anywhere in/on the suppressor core and baffle. Particular
attention shall be given to the areas described above. No cracks are allowed.
5.14.3 Primary Method. Flourescent Penetrant.
5.14.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in
Table 1-7. AMS 2644 level 3 penetrant materials shall be selected from the approved list in Table
1-8. Parts requiring flourescent penetrant inspection shall be cleaned prior to inspection with
n--Propyl Bromide (vapor degreasing only)(Table 1--8), DS--108 (Table 1--8), Electron (Table 1--8),
Positron (Table 1--8). DS--108, Electron, Positron must be followed by an acetone (Table 1--8) rinse
or wipe: or drying until there is no visible solvent residue left on parts.
