TM 1-1520-265-23
Change 2
5-21
5.12 EXHAUST FAIRINGS (PT).
5.12.1 Description (Figure 5-1, Index No. 12). The upper and lower fairings are the portions of the
exhaust module that contain the exhaust ejector.
5.12.2 Defects. Defects can occur anywhere on the surface of the exhaust fairings. No cracks are
allowed. Repeat this inspection after repairs.
5.12.3 Primary Method. Fluorescent Penetrant.
5.12.3.1 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.
5.12.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance
and the exhaust module removed in accordance with the applicable technical manuals listed in Table
1-1.
5.12.3.3 Access. Not applicable.
5.12.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.12.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent
Penetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 5-12.
5.12.3.6 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
5.12.4 Backup Method. None required.
5.12.5 System Securing. Clean the exhaust fairing to remove inspection media. Refer to Post
Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The exhaust module requires
installation in accordance with the applicable technical manuals listed in Table 1-1.
Figure 5-12. Exhaust Fairings
