TM 1-1520-265-23
5-36
Change 2
5.22.2 Defects. This inspection is to verify cracks found by visual inspection and to ensure no
cracks are present after repairs.
5.22.3 Primary Method. Fluorescent Penetrant.
5.22.3.1 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.
5.22.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance.
A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) may
be performed on all exposed surfaces of the installed part using this procedure. If required, the engine
shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
5.22.3.3 Access. Access is through engine cowl (Figure 1-4, items 3T-7 or 4T-8).
5.22.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.22.3.5 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 5-22.
5.22.3.6 Marking and Recording of Inspection Results. Mark and record the inspection results as
required by paragraph 1.3.
5.22.4 Backup Method. None required.
5.22.5 System Securing. Clean the inspected area to remove inspection media. Refer to Post
Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The engine, if removed,
requires installation in accordance with the applicable technical manuals listed in Table 1-1.
Figure 5-22. Engine Components
