TM 1-1520-265-23
5-24
Change 2
5.14.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance
and the suppressor removed and disassembled in accordance with the applicable technical manuals
listed in Table 1-1.
5.14.3.3 Access. Not applicable.
5.14.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.14.3.5 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 5-14.
5.14.3.6 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
5.14.4 Backup Method. None required.
5.14.5 System Securing. Clean the inspected areas to remove inspection media. Refer to Post
Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The suppressor requires
assembly and installation in accordance with the applicable technical manuals listed in Table 1-1.
5.15 HIRSS EXHAUST EXTENDER (PT).
5.15.1 Description (Figure 5-1, Index No. 15). The exhaust extender is attached to the aft end of
the HIRSS and directs the exhaust away from the helicopter. This procedure is applicable to the
attach angles, support beams, and struts.
5.15.2 Defects. Defects can occur anywhere on the described items. No cracks are allowed.
5.15.3 Primary Method. Fluorescent Penetrant.
5.15.3.1 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.
5.15.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance
and the exhaust extender removed in accordance with the applicable technical manuals listed in
Table 1-1.
5.15.3.3 Access. Not applicable.
5.15.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.15.3.5 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 5-15.
5.15.3.6 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
5.15.4 Backup Method. None required.
5.15.5 System Securing. Clean the inspected parts to remove inspection media. Refer to Post
Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The exhaust extender requires
installation in accordance with the applicable technical manuals listed in Table 1-1.
